Tootfinder

Won’t happen in my lifetime, but if the human race survives the next decade or so some of you young whippersnappers could be seeing this.
#science #spaceScience #exoPlanets

Could a unique rectangular telescope be the key to finding Earth 2.0?
"We show that this design can, in principle, find half of all existing Earth-like planets orbiting sun-like stars within 30 light-years in less than three years."

Measurement of dome turbulence intensity from scintillation pattern in the pupil of the telescope
Victor G. Kornilov, Matwey V. Kornilov, Boris S. Safonov, Anton S. Mironov, Dmitry V. Cheryasov, Igor A. Gorbunov, Ivan A. Strakhov
https://arxiv.org/abs/2509.02298

Measurement of dome turbulence intensity from scintillation pattern in the pupil of the telescope
We present measurements of optical turbulence (OT) power inside the telescope dome using an instrument registering fluctuations of intensity of a bright star at a plane conjugated to -2 km below the pupil of the telescope - Domecam. The measurements were conducted at the 2.5-m telescope of Caucasian Mountain Observatory of Sternberg Astronomical Institute Lomonosov Moscow State University in period 2022-2024 in different ambient conditions. The instrument was validated against Multi Aperture Sc…

All eyes on #3I/ATLAS ☄️
Our Mars Express & ExoMars Trace Gas Orbiter will observe the comet around its closest approach to Mars on 3 October 2025, when 3I/ATLAS will be around 30 million km from the red planet.

ESA observations of interstellar comet 3I/ATLAS
The European Space Agency (ESA) reacted promptly to the discovery of comet 3I/ATLAS on 1 July 2025. Soon after they were alerted to its existence by automated detection systems, ESA astronomers began using ground-based telescopes in Hawaii, Chile, and Australia to monitor its progress.Since then, the comet has been observed by space telescopes close to Earth, including the NASA/ESA Hubble Space Telescope and the NASA/ESA/CSA James Webb Space Telescope.In the coming months, ESA will turn interp…

The #GiantMagellanTelescope international consortium welcomed Academia Sinica Institute of Astronomy and Astrophysics, or ASIAA, as its newest member, the consortium announced Tuesday: https://astro.arizona.edu/news/giant-magellan-telescope-brings-new-partner-fold

Detection of OH maser emission in the 71-year periodic comet 12P/Pons-Brooks using the 40-m Thai National Radio Telescope (TNRT)
Nobuyuki Sakai, Saran Poshyachinda, Koichiro Sugiyama, Wiphu Rujopakarn, Boonrucksar Soonthornthum, Apichat Leckngam, Busaba Kramer, Phrudth Jaroenjittichai, Bannawit Pimpanuwat, Dan Singwong, Kitipoom Kanjana, Nikom Prasert, Songklod Punyawarin, Spiro Sarris, Teep Chairin, Kamorn Bandudej, Chalunthon Nuchur, Haseng Sani, Nattawit Chanwedchasart, Pathit Chatu…

Detection of OH maser emission in the 71-year periodic comet 12P/Pons-Brooks using the 40-m Thai National Radio Telescope (TNRT)
Although the optical cometary database is extensive, the radio database is limited. The 18-cm OH maser observations of comets allow us to determine (i) the production rate of OH ($Q_{\rm{OH}}$) and (ii) the water expansion velocity, for each comet. To reveal the physical properties of the periodic comet 12P/Pons-Brooks, we conducted the OH maser observations of the comet using the 40-m TNRT (Thai National Radio Telescope) on March 22nd, 27th and 29th, 2024 before the perihelion passage on April…

Observations of a Faint Nonthermal Onset before a GOES C-class Flare
Nat\'alia Bajnokov\'a, Iain G. Hannah, Hannah Collier, Stephen M. White, Lindsay Glesener, Reed B. Masek, Marianne S. Peterson, S\"am Krucker, Hugh S. Hudson
https://arxiv.org/abs/2510.02052

Observations of a Faint Nonthermal Onset before a GOES C-class Flare
We present analysis of a GOES C1-class flare from 2022 September 6, which was jointly observed as occulted by Nuclear Spectroscopic Telescope ARray (NuSTAR) and on-disk by Spectrometer/Telescope for Imaging X-rays (STIX). NuSTAR observed faint coronal nonthermal emission as well as plasma heating > 10 MK, starting 7 minutes prior to the flare. This onset emission implies that during this time, there is a continuous electron acceleration in the corona which could also be responsible for the obse…

Enhancing the development of Cherenkov Telescope Array control software with Large Language Models
Dmitriy Kostunin, Elisa Jones, Vladimir Sotnikov, Valery Sotnikov, Sergo Golovachev, Alexandre Strube
https://arxiv.org/abs/2510.01299

Enhancing the development of Cherenkov Telescope Array control software with Large Language Models
We develop AI agents based on instruction-finetuned large language models (LLMs) to assist in the engineering and operation of the Cherenkov Telescope Array Observatory (CTAO) Control and Data Acquisition Software (ACADA). These agents align with project-specific documentation and codebases, understand contextual information, interact with external APIs, and communicate with users in natural language. We present our progress in integrating these features into CTAO pipelines for operations and o…

Dark matter and fundamental physics with the Cherenkov Telescope Array Observatory
Francesco Schiavone (Bari Univ., INFN Bari)
https://arxiv.org/abs/2509.24523 https://

Dark matter and fundamental physics with the Cherenkov Telescope Array Observatory
The Cherenkov Telescope Array Observatory (CTAO) will be the next-generation major ground-based gamma-ray observatory. It will be made up of two large arrays of imaging atmospheric Cherenkov telescopes (IACTs), with one site in the Northern hemisphere (La Palma, Canary Islands) and one in the Southern (Paranal, Chile). CTAO aims to offer great improvement in energetic and angular resolution with respect to current IACT systems, spanning a photon energy range from 20 GeV to 300 TeV, as well as a…

Discovery of an Accretion Burst in a Free-Floating Planetary-Mass Object
V. Almendros-Abad, A. Scholz, B. Damian, R. Jayawardhana, A. Bayo, L. Flagg, K. Muzic, A. Natta, P. Pinilla, L. Testi
https://arxiv.org/abs/2510.01747

Discovery of an Accretion Burst in a Free-Floating Planetary-Mass Object
We report the discovery of a long-lasting burst of disk accretion in Cha J11070768-7626326 (Cha 1107-7626), a young, isolated, 5-10 M$_{\mathrm{Jupiter}}$ object. In spectra taken with XSHOOTER at ESO's Very Large Telescope as well as NIRSPEC and MIRI on the James Webb Space Telescope, the object transitions from quiescence in April-May 2025 to a strongly enhanced accretion phase in June-August 2025. The line flux changes correspond to a 6-8-fold increase in the mass accretion rate, reaching $1…

Some recent news about the butterfly nebulae…. https://www.esa.int/Science_Exploration/Space_Science/Webb/Webb_investigates_complex_heart_of_a_cosmic_butterfly
@…

Webb investigates complex heart of a cosmic butterfly
The NASA/ESA/CSA James Webb Space Telescope has revealed new details in the core of the Butterfly Nebula, NGC 6302. From the dense, dusty torus that surrounds the star hidden at the centre of the nebula to its outflowing jets, the Webb observations reveal many new discoveries that paint a never-before-seen portrait of a dynamic and structured planetary nebula.

Can an Anti-de Sitter Vacuum in the Dark Energy Sector Explain JWST High-Redshift Galaxy and Reionization Observations?
Anirban Chakraborty, Tirthankar Roy Choudhury, Anjan Ananda Sen, Purba Mukherjee
https://arxiv.org/abs/2509.02431

Can an Anti-de Sitter Vacuum in the Dark Energy Sector Explain JWST High-Redshift Galaxy and Reionization Observations?
The James Webb Space Telescope's (JWST) discovery of an unexpectedly high abundance of UV-bright galaxies at redshifts $z > 10$ poses a significant challenge to the standard $Λ$CDM cosmology. This work tests whether this tension can be resolved solely by modifying the cosmological background, without invoking significant evolution in the astrophysical properties of early galaxies. We investigate an alternative framework featuring the presence of an anti-de Sitter vacuum in the dark energy sect…

FPGA-Based RoCEv2-RDMA Readout Electronics for the CTAO-LST Advanced Camera
F. Marini, M. Bellato, A. Bergnoli, D. Corti, A. Griggio, R. Isocrate, L. Modenese, M. Toffano, C. Arcaro, F. Di Pierro, M. Mariotti, M. Mi, P. Wang
https://arxiv.org/abs/2509.02285

FPGA-Based RoCEv2-RDMA Readout Electronics for the CTAO-LST Advanced Camera
CTAO's (Cherenkov Telescope Array Observatory) largest telescopes type, the LST (Large-Sized Telescope), are being installed at the northern site of the Cherenkov Telescope Array (CTA) at the Observatorio del Roque de los Muchachos on the Canary island of La Palma. Their aim is to capture the lowest-energy gamma rays of the observatory. The hereby proposed readout electronics architecture, serving as a proof-of-concept for its advanced camera upgrade, relies on a custom high-channel count fast …

Argentina’s move to woo Trump has derailed South America’s largest radio telescope: #CART) in limbo, jeopardizing research into pulsars and other celestial objects.

Uncertainties in high-$z$ galaxy properties inferred from SED fitting using JWST NIRCam photometry
Jiyoung Choe, Taysun Kimm, Harley Katz, Maxime Rey, Daniel Han, J. K. Jang, Joki Rosdahl
https://arxiv.org/abs/2510.00400

Uncertainties in high-$z$ galaxy properties inferred from SED fitting using JWST NIRCam photometry
Numerous high-$z$ galaxies have recently been observed with the James Webb Space Telescope (JWST), providing new insights into early galaxy evolution. Their physical properties are typically derived through spectral energy distribution (SED) fitting, but the reliability of this approach for such early systems remains uncertain. Applying {\sc Bagpipes} on simulated SEDs at $z=6$ from the {\sc Sphinx$^{20}$} cosmological simulation, we examine uncertainties in the recovery of stellar masses, star…

A matter of perspective: how nanoscale optical defects limit cosmic-scale gravitational wave observations
Anna C. Green, Antonella Bianchi, Daniel D. Brown, Felice Feldmann, Jeremie Gobeil, Miron van der Kolk, Riccardo Maggiore, Jonathan W. Perry, Emma Prins, Mischa Salle, Alina Soflau, Enzo Tapia, Andreas Freise
https://arxiv.org/abs/2509…

A matter of perspective: how nanoscale optical defects limit cosmic-scale gravitational wave observations
Ground-based gravitational-wave (GW) detectors, such as LIGO, Virgo, and KAGRA, have revolutionised as- tronomy. Now, future detectors like the Einstein Telescope and Cosmic Explorer aim to achieve even greater sensitivity. Advanced optical simulations are crucial to overcoming the challenges faced by these complex in- terferometers. Finesse, the leading interferometer simulation tool in the GW community, supports the design and commissioning of these detectors by modeling optical, quantum, and…

At the dawning of the seventeenth century, Kepler's optics applied to the telescope in the hands of Galileo left no room for argument: whatever the Truth might be, Aristotelian physics was demonstrably dead, and vilified Copernicus redeemed.
https://knowablemagazine.org/content/article/technology/2025/super-resolution-microscopes-reveal-new-details-cells

Bayesian Gaussian Methods for Robust Background Modeling in CALorimetric Electron Telescope (CALET) Gravitational-Wave Searches
Bisweswar Sen
https://arxiv.org/abs/2509.25893 ht…

Bayesian Gaussian Methods for Robust Background Modeling in CALorimetric Electron Telescope (CALET) Gravitational-Wave Searches
The search for gamma-ray counterparts to gravitational-wave events with the CALET Gamma-ray Burst Monitor (CGBM) requires accurate and robust background modeling. Previous CALET observing runs (O3 and O4) relied on averaged pre/post-event baselines or low-order polynomial fits, approaches that neglect correlated noise, temporal non-stationarity, and the propagation of background uncertainty into derived flux upper limits. These simplifications can lead to reduced sensitivity to faint or atypica…

Mapping atmospheric features of the planetary-mass brown dwarf SIMP 0136 with JWST NIRISS
Roman Akhmetshyn, Etienne Artigau, Nicolas B. Cowan, Michael K. Plummer, Fei Wang, Ben Burningham, Bjorn Benneke, Rene Doyon, Ray Jayawardhana, David Lafreniere, Stanimir A. Metchev, Jason F. Rowe
https://arxiv.org/abs/2509.00149

Mapping atmospheric features of the planetary-mass brown dwarf SIMP 0136 with JWST NIRISS
In this paper, we analyze James Webb Space Telescope Near Infrared Imager and Slitless Spectrograph time-series spectroscopy data to characterize the atmosphere of the planetary-mass brown dwarf SIMP J01365662+093347. Principal component analysis reveals that 81\% of spectral variations can be described by two components, implying that variability within a single rotational phase is induced by at least three distinct spectral regions. By comparing our data to a grid of Sonora Diamondback atmosp…

maria goes NIFTy: Gaussian Process-Based Reconstruction and Denoising of Simulated (Sub-)Millimetre Single-Dish Telescope Data
Jonas W\"urzinger, Joshiwa van Marrewijk, Thomas W. Morris, Richard Fuchs, Tony Mroczkowski, Lukas Heinrich
https://arxiv.org/abs/2509.01600

maria goes NIFTy: Gaussian Process-Based Reconstruction and Denoising of Simulated (Sub-)Millimetre Single-Dish Telescope Data
(Sub-)millimetre single-dish telescopes feature faster mapping speeds and access larger spatial scales than their interferometric counterparts. However, atmospheric fluctuations tend to dominate their signals and complicate recovery of the astronomical sky. Here we develop a framework for Gaussian process-based sky reconstruction and separation of the atmospheric emission from the astronomical signal based on Numerical Information Field Theory (\texttt{NIFTy}). To validate this novel approach, …

Cosmological constraints from the Planck cluster catalogue with DES shear profiles and Chandra observations
G. Aymerich, S. Grandis, M. Douspis, G. W. Pratt, L. Salvati, F. Andrade-Santos, S. Bocquet, M. Costanzi, W. R. Forman, C. Jones, M. Aguena, F. Andrade-Oliveira, D. Bacon, D. Brooks, D. L. Burke, J. Carretero, L. N. da Costa, M. E. da Silva Pereira, T. M. Davis, J. De Vicente, S. Desai, H. T. Diehl, P. Doel, S. Everett, B. Flaugher, J. Frieman, E. Gaztanaga, D. Gruen, G. Gutierre…

Cosmological constraints from the Planck cluster catalogue with DES shear profiles and Chandra observations
We present cosmological constraints from the Planck PSZ2 cosmological cluster sample, using weak-lensing shear profiles from Dark Energy Survey (DES) data and X-ray observations from the Chandra telescope for the mass calibration. We compute hydrostatic mass estimates for all clusters in the PSZ2 sample with a scaling relation between their Sunyaev-Zeldovich signal and X-ray derived hydrostatic mass, calibrated with the Chandra data. We introduce a method to correct these masses with a hydrosta…

ImageMM - Joint Multi-frame Image Restoration and Super-resolution: #ImageProcessing

The JCMT Gould Belt Survey Complete Core Catalogue: Core mass function variations between nearby molecular clouds
Kate Pattle, James Di Francesco, Jenny Hatchell, Helen Kirk, Sarah Sadavoy, Derek Ward-Thompson, Doug Johnstone, Sammohith Nittala, Ronan Kerr, Jared Keown, Harold Butner, Simon Coud\'e, Malcolm Currie, Rachel Friesen, Tim Jenness, Lewis Knee, Glenn White

The JCMT Gould Belt Survey Complete Core Catalogue: Core mass function variations between nearby molecular clouds
We present a catalogue of dense cores identified in James Clerk Maxwell Telescope (JCMT) Gould Belt Survey SCUBA-2 observations of nearby star-forming clouds. We identified 2257 dense cores using the getsources algorithm, of which 59% are starless, and 41% are potentially protostellar. 71% of the starless cores are prestellar core candidates, suggesting a prestellar core lifetime similar to that of Class 0/I YSOs. Higher-mass clouds have a higher fraction of prestellar cores compared to protost…

Synergy between Roman and PRIMA imaging capabilities for large extragalactic surveys
M\'ed\'eric Boquien (Universit\'e C\^ote d'Azur, Observatoire de la C\^ote d'Azur, CNRS, Laboratoire Lagrange, Nice, France), Laure Ciesla (Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France), Roman Amestoy (Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France), Jason Glenn (NASA Goddard Space Flight Center, Greenbelt, Maryland, United States), Carlotta Gruppioni (Istituto Naz…

Synergy between Roman and PRIMA imaging capabilities for large extragalactic surveys
The Roman Space Telescope will be instrumental for characterizing the physical properties of galaxies and understanding their evolution across time. However, a complete view of galaxy star formation activity will only be possible with the addition of far-infrared observations that a telescope such as PRobe far-Infrared Mission for Astrophysics (PRIMA) will be able to provide. Indeed, PRIMA's far-infrared camera will be highly sensitive to dust emission, whereas Roman will probe the stellar emis…

The Aromatic Infrared Bands around the Wolf-Rayet Binary WR140 Revealed by JWST
Kotomi Taniguchi, Ryan M. Lau, Takashi Onaka, Macarena Garcia Marin, Hideo Matsuhara, Anthony Moffat, Theodore R. Gull, Thomas I. Madura, Gerd Weigelt, Riko Senoo, Alan T. Tokunaga, Walter Duley, Peredur M. Williams, Noel D. Richardson, Joel Sanchez-Bermudez
https://

The Aromatic Infrared Bands around the Wolf-Rayet Binary WR140 Revealed by JWST
We have analyzed the aromatic infrared bands (AIBs) in the 6-11.2 $μ$m range around the Wolf-Rayet binary WR140 (d=1.64 kpc) obtained with the James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) Medium-Resolution Spectrometer (MRS). In WR140's circumstellar environment, we have detected AIBs at 6 $μ$m and 7.7 $μ$m which are attributed to C-C stretching modes. These features have been detected in the innermost dust shell (Shell1; ~2100 au from WR140), the subsequent dust shell (S…

Winding Motion of Spirals in a Gravitationally Unstable #Protoplanetary Disk: https://arxiv.org/abs/2509.19761 -> Winding Motion of Planet-Forming Spirals Captured on Video for the First Time: https://alma-telescope.jp/en/news/press/vimage-202509.html -> Spirals in Planet-Forming Disk Caught Twisting for the First Time with ALMA: https://www.almaobservatory.org/en/press-releases/spirals-in-planet-forming-disk-caught-twisting-for-the-first-time-with-alma/

BABY 1L: First Tritium Breeding Campaign Results
R\'emi Delaporte-Mathurin, Nikola Goles, Collin Dunn, Emily Edwards, Sara Ferry, Ross MacDonald, Ethan Peterson, Davide Pettinari, Stefano Segantin, Weiyue Zhou, Kevin B. Woller
https://arxiv.org/abs/2509.26174

BABY 1L: First Tritium Breeding Campaign Results
Achieving tritium self-sufficiency is a critical challenge for future fusion power plants. The BABY 1L experiment, part of the LIBRA project at MIT, aims to benchmark tritium breeding and release in molten salt breeder systems under deuterium-tritium (DT) neutron irradiation. Building on the initial \SI{100}{mL} campaign, BABY 1L introduces a tenfold increase in breeder volume, improved thermal and gas handling systems, and enhanced neutron diagnostics, including a proton recoil telescope. We r…

Horizon-scale variability of M87* from 2017--2021 EHT observations
The Event Horizon Telescope Collaboration
https://arxiv.org/abs/2509.24593 https://arxiv…

Horizon-scale variability of M87* from 2017--2021 EHT observations
We report three epochs of polarized images of M87* at 230\,GHz using data from the Event Horizon Telescope (EHT) taken in 2017, 2018, and 2021. The baseline coverage of the 2021 observations is significantly improved through the addition of two new EHT stations: the 12\,m Kitt Peak Telescope and the Northern Extended Millimetre Array (NOEMA). All observations result in images dominated by a bright, asymmetric ring with a persistent diameter of $43.9\pm 0.6\,\muas$, consistent with expectations …

A Cold and Super-Puffy Planet on a Polar Orbit
Juan I. Espinoza-Retamal, Rafael Brahm, Cristobal Petrovich, Andr\'es Jord\'an, Thomas Henning, Trifon Trifonov, Joshua N. Winn, Erika Rea, Maximilian N. G\"unther, Abdelkrim Agabi, Philippe Bendjoya, Hareesh Bhaskar, Fran\c{c}ois Bouchy, M\'arcio Catelan, Carolina Charalambous, Vincent Deloupy, George Dransfield, Jan Eberhardt, N\'estor Espinoza, Alix V. Freckelton, Tristan Guillot, Melissa J. Hobson, Mat\'ias I. …

A Cold and Super-Puffy Planet on a Polar Orbit
We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density $<0.3$ g/cm$^3$ on a 105-day polar orbit around a $700$ Myr old F star. The transits were detected using data from TESS as well as the Antarctic telescope ASTEP. A joint analysis of the light curves and radial velocities from HARPS, FEROS, and CORALIE confirmed the planetary nature of the signal by limiting the mass to be below $30\,M_\oplus$ at $95\%$ confidence. The radial velocities also exhibit the Rossiter-McLaug…

Lessons Learned from Studying H$\alpha$ Galaxy Kinematics with Mock JWST/NIRSpec IFU Observations at $z > 6$
Si\^an Phillips, Francesca Rizzo, Mahsa Kohandel, Renske Smit, Andrea Pallottini
https://arxiv.org/abs/2510.01327

Lessons Learned from Studying H$α$ Galaxy Kinematics with Mock JWST/NIRSpec IFU Observations at $z > 6$
Galaxies with a disk morphology have been established at $z > 9$ with the James Webb Space Telescope (JWST). However, confirming their disky nature requires studying their gas kinematics, which can be challenging when relying solely on the warm gas observed by JWST. Unlike the cold gas traced by the Atacama Large Millimetre/Submillimetre Array (ALMA), warm gas is sensitive to outflows, complicating the interpretation of the disk dynamics. This elicits the question of how to compare information …

POKEMON: print optimization for kilo-fiber experiments using micro-optics and nanostructures
Megan Delamer, Suvrath Mahadevan, Chad Bender, Ceiwynn Longworth, Roger Angel, Joel Berkson, On To Sonja Choi, Kathleen Gehoski, Andy Monson, Chrisitan Schwab
https://arxiv.org/abs/2509.00181

POKEMON: print optimization for kilo-fiber experiments using micro-optics and nanostructures
The most pressing problems in modern astrophysics have often required the largest telescopes. With the cost scaling of mirror diameters, the field as a whole is faced with a challenge -- how to replicate or improve on the collecting area and sensitivity of the current generation of ELTs, which already boast 30 m class apertures and are multi-billion dollar facilities. One such approach is being pursued by the Large Fiber Array Spectroscopic Telescope (LFAST) -- a scalable array telescope. Each …

A Carbon-rich Disk Surrounding a Planetary-mass Companion: #disc offers insight into how the moons of solar system gas giants like Jupiter might have formed.

A Large Sample of JWST/NIRSpec Brown Dwarfs: New Distant Discoveries
Zhijun Tu, Shu Wang, Xiaodian Chen, Jifeng Liu
https://arxiv.org/abs/2510.02026 https://

A Large Sample of JWST/NIRSpec Brown Dwarfs: New Distant Discoveries
Brown dwarfs are essential probes of stellar and planetary formation, yet their low luminosities pose challenges for detection at large Galactic distances. The James Webb Space Telescope (JWST), with its unprecedented near-infrared sensitivity, enables the discovery and characterization of distant substellar objects, including those in the Milky Way's thick disk and halo. We conducted a systematic search using over 40,000 publicly available JWST/NIRSpec PRISM/CLEAR spectra and identified 68 bro…

Discovery of diffuse gamma-ray emission in the vicinity of G172.8 1.5: An old supernova remnant with different turbulence properties
Yuan Li, Gwenael Giacinti, Siming Liu
https://arxiv.org/abs/2510.01340

Discovery of diffuse gamma-ray emission in the vicinity of G172.8+1.5: An old supernova remnant with different turbulence properties
We report the detection of high-energy $γ$-ray emission in the vicinity of G172.8+1.5, which is debated as a Supernova remnant (SNR) or an ionized hydrogen (H$_{\rm{II}}$) region. Using 16-yr Pass 8 data from Fermi Large Area Telescope (Fermi-LAT), we found the GeV emission can be described by two extended sources with different photon spectra. Among them, the much more extended $γ$-ray source SrcA with a Power-law spectrum is spatially coincident with a giant neutral Hydrogen shell structure…

Radiative Transfer Modeling of a Shadowed Protoplanetary Disk assisted by a Neural Network
Jonathan P. Williams, Myriam Benisty, Christian Ginski, Giuseppe Lodato, Maria Vincent
https://arxiv.org/abs/2509.01937

Radiative Transfer Modeling of a Shadowed Protoplanetary Disk assisted by a Neural Network
We present observations and detailed modeling of a protoplanetary disk around the T Tauri star, V1098 Sco. Millimeter wavelength data from the Atacama Large Millimeter Array (ALMA) show a ring of large dust grains with a central cavity that is filled with molecular gas. Near-infrared data with the Very Large Telescope (VLT) detect the scattered starlight from the disk surface and reveal a large shadow that extends over it's entire southern half. We model the ALMA continuum and line data to dete…

Sieging HELM's deep: PRIMA unveils the far-infrared properties of highly extincted low-mass galaxies
Laura Bisigello, Carlotta Gruppioni, Giulia Rodighiero, Giovanni Gandolfi, James M. S. Donnellan, Seb Oliver, Stephen M. Wilkins, L. Y. Aaron Yung
https://arxiv.org/abs/2509.01305

Sieging HELM's deep: PRIMA unveils the far-infrared properties of highly extincted low-mass galaxies
Although the majority of star-forming galaxies show a tight correlation between stellar mass and dust extinction, recent James Webb Space Telescope observations have revealed a peculiar population of Highly Extincted Low-Mass (HELM) galaxies, which could revolutionise our understanding of dust production mechanisms. To fully understand the dust content of these galaxies, which are a minority of the overall galaxy population, far-infrared observations over large areas are pivotal. In this paper,…

JADES: An Abundance of Ultra-Distant T- and Y-Dwarfs in Deep Extragalactic Data
Kevin N. Hainline, Jakob M. Helton, Brittany E. Miles, Jarron Leisenring, Mark S. Marley, Sagnick Mukherjee, Nicholas F. Wogan, Andrew J. Bunker, Benjamin D. Johnson, Roberto Maiolino, Marcia Rieke, Pierluigi Rinaldi, Brant Robertson, Fengwu Sun, Sandro Tacchella, Christina C. Williams, Christopher N. A. Willmer

JADES: An Abundance of Ultra-Distant T- and Y-Dwarfs in Deep Extragalactic Data
Ultra-cool T- (T$_{\mathrm{eff}} \approx$ 500 - 1200 K) and Y-dwarfs (T$_{\mathrm{eff}}$ $\lessapprox 500$ K) have historically been found only a few hundred parsecs from the Sun. The sensitivity and wavelength coverage of the NIRCam instrument on board the James Webb Space Telescope offer a unique method for finding low-temperature brown dwarfs in deep extragalactic datasets out to multiple kiloparsecs. Here we report on the selection of a sample of 41 brown dwarf and brown dwarf candidates ac…

Multiband Optical Photometric and Spectroscopic Monitoring of the 2024 Flare Event in Transition Blazar OP313
TianFang Zhang, Mitsuru Kokubo, Mamoru Doi, Haruna Hagio, Hibiki Seki, Ichiro Takahashi, Katsuhiro L. Murata, Kazuya Matsubayashi, Keisuke Isogai, Koji Kawabata, Mahito Sasada, Masafumi Niwano, Masaki Hashizume, Megumi Shidatsu, Narikazu Higuchi, Ryo Imazawa, Shigeaki Joshima, Shigeyuki Sako, Shunsuke Hayatsu, Yoichi Yatsu, Wataru Iwakiri, Yoshiyuki Kubo

Multiband Optical Photometric and Spectroscopic Monitoring of the 2024 Flare Event in Transition Blazar OP313
Blazars are active galactic nuclei known for their extreme variability, offering unique opportunities to study jet physics and high-energy emission mechanisms. In 2024, the Flat Spectrum Radio Quasar (FSRQ) OP313 underwent a remarkable flare event, during which the gamma-ray flux observed by the Fermi Large Area Telescope (Fermi/LAT) increased by a factor of 60 over its average value. The flare peak lasted less than two days. Using optical telescopes, we conducted 100-day time-scale observation…

Unveiling Unprecedented Fine Structure in Coronal Flare Loops with the #DKIST: https://iopscience.iop.org/article/10.3847/2041-8213/adf95e -> The NSF Inouye Solar Telescope Delivers Record-Breaking Images of Solar Flare, Coronal Loops: https://nso.edu/press-release/the-nsf-inouye-solar-telescope-delivers-record-breaking-images-of-solar-flare-coronal-loops/

J-VAR: the northern variable sky in 7 filters -- First Data Release
A. Ederoclite, H. V\'azquez Rami\'o, A. Alvarez-Candal, B. B. Siffert, V. M. Placco, D. Morate, S. Pyrzas, C. L\'opez-Sanjuan, M. Mahlke, S. Kulkarni, L. Espinosa, M. J. Castro, B. Zacarias, M. Akhlaghi, J. Castillo, T. Civera, J. Hern\'andez-Fuertes, A. Hern\'an-Caballero, A. L\'opez-Sainz, G. Lorenzetti, D. Muniesa-Gallardo, A. Moreno-Signes, H. Vives-Arias, J. Zaragoza Cardiel, M. C. D\'i…

J-VAR: the northern variable sky in 7 filters -- First Data Release
Aims. The analysis of variability of astronomical sources is of extraordinary interest, as it allows the study of astrophysical phenomena in real time. This paper presents the Javalambre Variability Survey (J-VAR) which leverages the narrow band filters available at the Javalambre Auxiliary Survey Telescope (JAST80) at the Observatorio Astrofísico de Javalambre (OAJ). Methods. The JAST80 equipped with T80Cam, providing a field of view of 2\,square degrees and a pixel scale of 0.55\,arcsec/pi…

Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS
R. G. Varadaraj, R. A. A. Bowler, M. J. Jarvis, J. R. Weaver, E. Ba\~nados, P. Holloway, K. I. Caputi, S. M. Wilkins, D. Yang, B. Milvang-Jensen, L. Gabarra, P. A. Oesch, A. Amara, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, A. Biviano, E. Branchini, M. Brescia, S. Camera, G. Ca\~nas-Herrera, V. Capobianco, C. Carbone, J. Carretero, M. Castellano, G. Castignani, S. Cavuoti, …

Euclid: Discovery of bright $z\simeq7$ Lyman-break galaxies in UltraVISTA and Euclid COSMOS
We present a search for $z\simeq7$ Lyman-break galaxies using the $1.72 \, \rm{deg}^2$ near-infrared UltraVISTA survey in the COSMOS field, reaching $5\,σ$ depths in $Y$ of 26.2. We incorporate deep optical and Spitzer imaging for a full spectral energy distribution (SED) fitting analysis. We find 289 candidate galaxies at $6.5\leq z \leq 7.5$ covering $-22.6 \leq M_{\rm UV} \leq -20.2$, faint enough to overlap with Hubble Space Telescope studies. We conduct a separate selection by including c…

Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors
Jonathan Carney, Igor Andreoni, Brendan O'Connor, James Freeburn, Hannah Skobe, Lewi Westcott, Malte Busmann, Antonella Palmese, Xander J. Hall, Ramandeep Gill, Paz Beniamini, Eric R. Coughlin, Charles D. Kilpatrick, Akash Anumarlapudi, Nicholas M. Law, Hank Corbett, Tomas Ahumada, Ping Chen, Christopher Conselice, Guillermo D…

Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors
GRB 250702B was the longest gamma-ray burst ever observed, with a duration that challenges standard collapsar models and suggests an exotic progenitor. We collected a rich set of optical and infrared follow-up observations of its rapidly fading afterglow using a suite of telescopes including the W. M. Keck Observatory, the Gemini telescopes, the Magellan Baade Telescope, the Victor M. Blanco 4-meter telescope, and the Fraunhofer Telescope at Wendelstein Observatory. Our analysis reveals that th…

The ASPIICS solar coronagraph aboard the Proba-3 formation flying mission. Scientific objectives and instrument design
A. N. Zhukov, C. Thizy, D. Galano, B. Bourgoignie, L. Dolla, C. Jean, B. Nicula, S. Shestov, C. Galy, R. Rougeot, J. Versluys, J. Zender, P. Lamy, S. Fineschi, S. Gunar, B. Inhester, M. Mierla, P. Rudawy, K. Tsinganos, S. Koutchmy, R. Howard, H. Peter, S. Vives, L. Abbo, C. Aime, K. Aleksiejuk, J. Baran, U. Bak-Steslicka, A. Bemporad, D. Berghmans, D. Besliu-Ionescu, S…

The ASPIICS solar coronagraph aboard the Proba-3 formation flying mission. Scientific objectives and instrument design
We describe the scientific objectives and instrument design of the ASPIICS coronagraph launched aboard the Proba-3 mission of the European Space Agency (ESA) on 5 December 2024. Proba-3 consists of two spacecraft in a highly elliptical orbit around the Earth. One spacecraft carries the telescope, and the external occulter is mounted on the second spacecraft. The two spacecraft fly in a precise formation during 6 hours out of 19.63 hour orbit, together forming a giant solar coronagraph called AS…

A transmission hologram for slitless spectrophotometry on a convergent telescope beam. Optimisation and characterization
Sylvie Dagoret-Campagne, Marc Moniez, Jeremy Neveu, Aurelien Blot, Pierre Antilogus, Claire Juramy, Leurent Le Guillou, Philippe Repain, Eduardo Sepulveda, Christophe Michel, Francois Colas
https://arxiv.org/abs/2509.255…

A transmission hologram for slitless spectrophotometry on a convergent telescope beam. Optimisation and characterization
This article details the optimisation and the characterisation of the hologram described in a companion paper published in 2021, which showed the superiority of a holographic optical element over a periodic grating as a disperser installed in the path of a converging beam on an on-axis detector (unbent spectrograph) for slitless spectroscopy. In this article, we describe in detail the development and optimisation of the final optical holographic element installed on the spectrograph of the auxi…

Understanding the Evolution of Black Hole Accretion and Dust out to z=4 with a Deep Imaging Extragalactic Survey with PRIMA
Andreas L. Faisst, Chian-Chou Chen, Laure Ciesla, Carlotta Gruppioni
https://arxiv.org/abs/2509.01674

Understanding the Evolution of Black Hole Accretion and Dust out to z=4 with a Deep Imaging Extragalactic Survey with PRIMA
The cosmic evolution of obscured star formation, dust properties and production mechanisms, and the prevalence of dust-obscured AGN out to high redshifts are currently some of the hot topics in astrophysics. While much progress has been made in the early days with Spitzer and Herschel, these facilities have not reached the necessary depths to observe the mid-IR light of high-redshift (z > 3) galaxies. Recently, the James Webb Space Telescope (JWST) has filled in the blue side of the rest-frame …

Glitch analysis and asteroseismic modelling of subgiant $\mu$ Herculis: confirming and interpreting the $\Gamma_1$ peak as the helium glitch
Advik Gupta, Kuldeep Verma, Hans Kjeldsen, Frank Grundahl, J{\o}rgen Christensen-Dalsgaard, Mark L. Winther, Jakob L. R{\o}rsted, Amalie Stokholm, V\'ictor Aguirre B{\o}rsen-Koch
https://arxiv.org…

Glitch analysis and asteroseismic modelling of subgiant $μ$ Herculis: confirming and interpreting the $Γ_1$ peak as the helium glitch
The measurements of pressure-mode and mixed-mode oscillation frequencies in subgiant stars offer a unique opportunity to probe their internal structures -- from the surface to the deep interior -- and to precisely determine their global properties. We have conducted a detailed asteroseismic analysis of the benchmark subgiant $μ$ Herculis using eight seasons of radial velocity observations from the SONG telescope, and have determined its mass, radius, age, and surface helium abundance to be $1.…

Spectral characterization and performance of SPT-SLIM on-chip filterbank spectrometers
C. S. Benson, K. Fichman, M. Adamic, A. J. Anderson, P. Barry, B. A. Benson, E. Brooks, J. E. Carlstrom, T. Cecil, C. L. Chang, K. R. Dibert, M. Dobbs, K. S. Karkare, G. K. Keating, A. M. Lapuente, M. Lisovenko, D. P. Marronexi, J. Montgomery, T. Natoli, Z. Pan, A. Rahlin, G. Robson, M. Rouble, G. Smecherxii, V. Yefremenko, M. R. Young, C. Yu, J. A. Zebrowski, C. Zhang

Spectral characterization and performance of SPT-SLIM on-chip filterbank spectrometers
The South Pole Telescope Shirokoff Line Intensity Mapper (SPT-SLIM) experiment is a pathfinder for demonstrating the use of on-chip spectrometers for millimeter Line Intensity Mapping. We present spectral bandpass measurements of the SLIM spectrometer channels made on site using a Fourier Transform Spectrometer during SPT-SLIMs first deployment the 2024-2025 austral summer observing season. Through this we demonstrate a technique for measuring the narrow band passes of the SPT-SLIM filterbanks …

Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
Yann Gouttenoire, Sokratis Trifinopoulos, Miguel Vanvlasselaer
https://arxiv.org/abs/2508.19328

Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
The detection of compact binary mergers with sub-solar masses at gravitational-wave observatories could mark the groundbreaking discovery of primordial black holes (PBHs). Concurrently, evidence for a nHz stochastic gravitational wave background observed by pulsar timing arrays (PTAs) could suggest a non-astrophysical origin, potentially arising from scalar-induced gravitational waves (SIGW). In this work, we analyze the connection between the two phenomena in the case where they share a common…

Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light
Miku Tsujii, Tomonaga Tanaka, Alessandro Fasano, Ricardo G\'enova-Santos, Shunsuke Honda, Yonggil Jo, Keisuke Kataoka, Chiko Otani, Mike Peel, Junya Suzuki, Osamu Tajima, Eunil Won, Makoto Hattori
https://arxiv.org/abs/2509.22071

Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light
We presented the optimization procedures of the baffle mounted on the GroundBIRD telescope for measuring the polarization of the Cosmic Microwave Background~(CMB). The telescope employs dual mirror reflective telescopes installed in a cryostat. The primary objectives were to minimize stray light contamination, maintain the integrity of the main beam, and ensure that thermal loading from the baffle remains significantly below that from the atmosphere. Using quasi-optical simulations, we have opt…

Deep Learning Reconstruction on Crab LST-1 Data
Bastien Lacave, Tjark Miener, Alexander Cervi\~no
https://arxiv.org/abs/2509.24499 https://arxiv.org/pdf/25…

Deep Learning Reconstruction on Crab LST-1 Data
The Cherenkov Telescope Array Observatory (CTAO) is the next-generation ground-based observatory for very-high-energy (VHE) gamma-ray astronomy. The Large-Sized Telescope prototype, LST-1, located on the Canary Island of La Palma, is responsible for observation of the low-energy range of the VHE gamma-ray spectrum. It is undergoing commissioning and has already observed the Crab Nebula as a standard reference source. Accurate reconstruction of shower parameters (e.g. energy, direction, and part…

The Transit Signal of KOI-1755 Originates from a Background Eclipsing Binary Star — Extracting the Light Curve of a Faint Background Star from #Kepler Target Pixel File Data: https://iopscience.iop.org/article/10.3847/1538-3881/ade718 -> Researchers Uncover True Source of KOI-1755 Transit Signal Using Kepler Space Telescope: https://english.cas.cn/newsroom/research_news/phys/202509/t20250904_1053933.shtml

The Open-Source Photochem Code: A General Chemical and Climate Model for Interpreting (Exo)Planet Observations
Nicholas F. Wogan, Natasha E. Batalha, Kevin Zahnle, Joshua Krissansen-Totton, David C. Catling, Eric T. Wolf, Tyler D. Robinson, Victoria Meadows, Giada Arney, Shawn Domagal-Goldman
https://arxiv.org/abs/2509.25578

The Open-Source Photochem Code: A General Chemical and Climate Model for Interpreting (Exo)Planet Observations
With the launch of the James Webb Space Telescope, we are firmly in the era of exoplanet atmosphere characterization. Understanding exoplanet spectra requires atmospheric chemical and climate models that span the diversity of planetary atmospheres. Here, we present a more general chemical and climate model of planetary atmospheres. Specifically, we introduce the open-source, one-dimensional photochemical and climate code Photochem, and benchmark the model against the observed compositions and c…

PRIMA: PRIMAger, a far-infrared hyperspectral and polarimetric instrument
Laure Ciesla, Charles Darren Dowell, Marc Sauvage, Denis Burgarella, Jochem Baselmans, Matthieu B\'ethermin, Jeffrey T. Booth, Charles M. Bradford, Florent Canourgues, Ivan Charles, Anne Costille, Thomas Essinger-Hileman, Lorenza Ferrari, Johan Floriot, Marc Foote, Jason Glenn, Renaud Goullioud, Matt Griffin, Oliver Krause, Willem Jellema, Elizabeth Luthman, Laurent Martin, Margaret Meixner, Tony Pamplona, Kl…

PRIMA: PRIMAger, a far-infrared hyperspectral and polarimetric instrument
The PRobe far-Infrared Mission for Astrophysics (PRIMA) is an infrared observatory for the next decade, currently in Phase A, with a 1.8m telescope actively cooled to 4.5K. On board, an infrared camera, PRIMAger, equipped with ultra-sensitive kinetic inductance detector (KID) arrays, will provide observers with coverage of mid-infrared to far-infrared wavelengths from 24 to 264 microns. PRIMAger will offer two imaging modes: the Hyperspectral mode will cover the 24-84 microns wavelength range w…

Comological Prediction from the joint observation of MeerKAT and CSST at $z$ = 0.4 $\sim$ 1.2
Yu-Er Jiang, Yan Gong, Qi Xiong, Wenxiang Pei, Yun Liu, Furen Deng, Zi-yan Yuwen, Meng Zhang, Xingchen Zhou, Xuelei Chen, Yin-Zhe Ma, Qi Guo, Bin Yue
https://arxiv.org/abs/2509.23343

Comological Prediction from the joint observation of MeerKAT and CSST at $z$ = 0.4 $\sim$ 1.2
Cross-correlating neutral hydrogen (HI) 21cm intensity mapping with galaxy surveys provides an effective probe of astrophysical and cosmological information. This work presents a cross-correlation analysis between MeerKAT single-dish HI intensity mapping and Chinese Space Station Survey Telescope (CSST) spectroscopic galaxy surveys in $z=0.4\sim1.2$, which will share a survey area of several thousand square degrees. Utilizing Jiutian-1G cosmological simulation, we simulate the observational dat…

On-sky Demonstration of #Subdiffraction-limited Astronomical Measurement Using a #PhotonicLantern: #Telescope hack opens a sharper view into the universe: https://newsroom.ucla.edu/releases/telescope-hack-peers-deeper-into-universe - it is the first time the novel imaging technique has been used on telescopes.

Signal processing and data acquisition system for the BTO detectors onboard COSI
Shunsaku Nagasawa, Tadayuki Takahashi, Kazuhiro Nakazawa, Hannah Gulick, Claire Chen, Hiroki Yoneda, Keigo Okuma, Matt Dexter, Josh Forgione, Nihal Gulati, Andrew Ji, Kaylie Ching, Isabel Schmidtke, Sarah Jauregui, Eric Yang, Andreas Zoglauer, Juan Carlos Martinez Oliveros, John Tomsick

Signal processing and data acquisition system for the BTO detectors onboard COSI
The energy range from a few hundred keV to a few MeV includes important probes such as nuclear gamma-rays and the 511 keV annihilation line. However, compared to X-rays and GeV/TeV gamma-rays, this range suffers from lower sensitivity by orders of magnitude. The upcoming NASA SMEX satellite mission Compton Spectrometer and Imager (COSI), scheduled for launch in 2027, is expected to break through this limitation with its Compton telescope utilizing a germanium semiconductor detector, covering th…

A Combined TESS and Ground-based Study of Transit Timing Variations in HAT-P-16, TOI-1516 and TOI-2046 Systems
E. Sonbas, K. Kaplan, M. Tanriver, A. Keskin, K. S. Dhuga, A. Bulut, E. Gogus, W. Ogloza
https://arxiv.org/abs/2509.21551

A Combined TESS and Ground-based Study of Transit Timing Variations in HAT-P-16, TOI-1516 and TOI-2046 Systems
We present new results for the hot Jupiters HAT-P-16b, TOI-1516b, and TOI-2046b, based on photometric observations collected using both space- and ground-based facilities. Ground-based data were collected in the 2020-2024 time span with the 0.6 m telescope (ADYU60) located at the Adiyaman University Application and Research Center (Adiyaman, Türkiye) and the 1.0 m telescope at the Türkiye National Observatory (TUG, Türkiye). Through a combination of fits to our ground-based data, the mid-tra…

ADARI: Visualizing the quality of VLT data
C. E. Garc\'ia-Dab\'o, P. Beirao, Z. Kostrzewa, A. Gabasch, B. Wolff, M. White, M. Deshpande, B. Miszalski, P. Corcho-Caballero, C. Onken, A. Heng, M. Gonz\'alez
https://arxiv.org/abs/2510.00147

ADARI: Visualizing the quality of VLT data
ADARI (Astronomical DAta Reporting Infrastructure) is a system designed for creating graphical reports of astronomical data so that the quality of these products can be assessed. It has been designed from the ground up to be backend-agnostic, meaning the same ADARI code can be sent to a web plotting API, or a code-based plotting API, with no alteration. Quick data inspection is an important feature in data reduction systems. The use cases range from quality control at the telescope, advance q…

A previously unknown regular satellite of #Uranus has been detected in a series of images obtained by the Near-Infrared Camera (NIRCam) onboard the James Webb Space Telescope on 2025 Feb. 2: http://www.cbat.eps.harvard.edu/iau/cbet/005500/CBET005593.txt -> https://science.nasa.gov/blogs/webb/2025/08/19/new-moon-discovered-orbiting-uranus-using-nasas-webb-telescope/ - the object is located at a projected radial distance of 56250 /- 250 km from Uranus' center in the planet's equatorial plane, initial astrometry is consistent with the moon orbiting on a nearly circular orbit with an orbital period 0.402 days, and the observed IR flux from the object indicates a radius of 4 - 5 km, placing it well below the detection threshold of earlier images from Voyager and the Hubble Space Telescope.

Second-timescale Glints from Satellites and Space Debris Detected with Tomo-e Gozen
Masaomi Tanaka, Ichiro Takahashi, Naoki Yoshida, Naonori Ueda, Akisato Kimura, Kazuma Mitsuda, Hirofumi Noda, Shigeyuki Sako, Noriaki Arima, Mitsuru Kokubo, Tomoki Morokuma, Yuu Niino, Nozomu Tominaga, Kenzo Kinugasa, Naoto Kobayashi, Sohei Kondo, Yuki Mori, Ryou Ohsawa, Hidenori Takahashi, Satoshi Takita

Second-timescale Glints from Satellites and Space Debris Detected with Tomo-e Gozen
A search for second-timescale optical transients is one of the frontiers of time-domain astronomy. However, it has been pointed out that reflections of sunlight from Earth-orbiting objects can also produce second-timescale ``glints.'' We conducted wide-field observations at 2 frames per second using Tomo-e Gozen on the 1.05 m Kiso Schmidt telescope. We identified 1554 point-source glints that appeared in only one frame (0.5 sec). Their brightness ranges from 11 to 16 mag, with fainter glints be…

VERITAS Follow-Up Observations of the Ultra-High-Energy Neutrino Event KM3-230213A
Connor Mooney (for the VERITAS Collaboration)
https://arxiv.org/abs/2509.25422 https://…

VERITAS Follow-Up Observations of the Ultra-High-Energy Neutrino Event KM3-230213A
The recent announcement of the detection of the ultra-high-energy (UHE) neutrino event KM3-230213A by the KM3NeT telescope represents a critical opportunity to explore the origins of cosmic neutrinos and their potential gamma-ray counterparts. With an inferred neutrino energy exceeding 100 PeV, this event stands as the most energetic neutrino observed to date. The large offset from the galactic plane (11 degrees) and the presence of several blazars with temporally correlated multiwavelength cou…

Detection of a white dwarf orbiting a Carbon-Oxygen depleted blue straggler in 47 Tucanae
Elisabetta Reggiani, Mario Cadelano, Barbara Lanzoni, Francesco R. Ferraro, Maurizio Salaris, Alessio Mucciarelli
https://arxiv.org/abs/2508.21118

Detection of a white dwarf orbiting a Carbon-Oxygen depleted blue straggler in 47 Tucanae
We have employed deep far-UV observations secured with the Solar Blind Channel of the Advanced Camera for Surveys onboard the Hubble Space Telescope to search for hot companions to five blue stragglers stars (BSSs) showing significant surface depletion of carbon (C) and oxygen (O), in the Galactic globular cluster 47 Tucanae. Such a chemical pattern has been interpreted as the chemical signature of the mass transfer formation process for the observed blue stragglers. The mass transfer origin is…

And the prize for the most painful #acronym in an astronomy paper's title in the past few weeks goes to ... ASTRONAUT = A databaSe of millimeTeR ObservatioNs of Asteroids Using acT (which itself stands for the Atacama Cosmology Telescope the regular acronym of which is ACT): https://arxiv.org/abs/2508.18300.

First Light for the GRAVITY Adaptive Optics: Extreme Adaptive Optics for the Very Large Telescope Interferometer
GRAVITY Collaboration
https://arxiv.org/abs/2509.21431 https:/…

First Light for the GRAVITY+ Adaptive Optics: Extreme Adaptive Optics for the Very Large Telescope Interferometer
GRAVITY+ improves by orders of magnitude the sensitivity, sky-coverage and contrast of the Very Large Telescope Interferometer (VLTI). A central part of this project is the development of Gravity Plus Adaptive Optics (GPAO), a dedicated high-order and laser-guide star Adaptive Optics (AO) system for VLTI. GPAO consists of four state-of-the-art AO systems equipping all 8m-class Unit Telescopes (UTs) for the wavefront correction of the VLTI instruments. It offers both visible and infrared Natural…

The Atacama Cosmology Telescope: Release of A databaSe of millimeTeR ObservatioNs of Asteroids Using acT (ASTRONAUT)
Ricco C. Venterea, John Orlowski-Scherer, Nicholas Battaglia, Sigurd Naess, Steve K. Choi, Allen Foster, Joseph Golec, Bruce Patridge, Crist\'obal Sif\'on
https://arxiv.org/abs/2508.18300

The Atacama Cosmology Telescope: Release of A databaSe of millimeTeR ObservatioNs of Asteroids Using acT (ASTRONAUT)
We present A databaSe of millimeTeR ObservatioNs of Asteroids Using acT (ASTRONAUT) hosted on Amazon Web Services, Inc. (AWS) in the form of a public Amazon Simple Storage Service (S3) bucket. This bucket is an Amazon cloud storage database containing flux measurements for a group of asteroids at millimeter (mm) wavelengths. These measurements were collected by the Atacama Cosmology Telescope (ACT) from 2017 to 2021 in frequency bands centered near 90, 150, and 220 GHz. The ASTRONAUT database c…

An excess of luminous white dwarfs in the peculiar Galactic globular cluster NGC 2808
Laksh Gupta, Samyaday Choudhury, Annalisa Calamida, Christian I. Johnson, Domenico Nardiello
https://arxiv.org/abs/2509.26190

An excess of luminous white dwarfs in the peculiar Galactic globular cluster NGC 2808
We study the white dwarf (WD) cooling sequence of the Galactic Globular Cluster (GGC) NGC 2808 by using deep near-UV data from the Hubble Space Telescope and theoretical models, to investigate if this cluster hosts an excess of WDs. Excess in WDs is a rare phenomenon that has been found to exist only in a few GGCs. We compared star counts from different evolutionary phases on the near-UV color-magnitude diagram to evolutionary times predicted by BaSTI models. The investigation was carried out o…

Dwarf Galaxies in the MATLAS Survey: Hubble Space Telescope Observations of Nuclear Star Clusters
M\'elina Poulain, Francine R. Marleau, Pierre-Alain Duc, Rub\'en S\'anchez-Janssen, Patrick R. Durrell, Sanjaya Paudel, Rebecca Habas, Oliver M\"uller, Sungsoon Lim, Nick Heesters, J\'er\'emy Fensch
https://arxiv.org/a…

Performance of LACT Array: Instrument Response Functions and Source Prospects
Zhipeng Zhang, Ruizhi Yang, Shoushan Zhang
https://arxiv.org/abs/2509.20694 https://

Performance of LACT Array: Instrument Response Functions and Source Prospects
Large Array of imaging atmospheric Cherenkov Telescope (LACT) is an array of 32 Cherenkov telescopes with 6-meter diameter mirrors to be constructed at the LHAASO site, aiming to enhance our understanding of ultra-high energy gamma ray astronomy. This work presents a detailed performance assessment of the LACT array, focusing on the IRFs for both an 8-telescope subarray configuration optimized for large zenith angle observations (60°) and the full 32-telescope array, with a particular emphasis…

On the Transients Handler for the Cherenkov Telescope Array Observatory
Tiffany Collins, Kathrin Egberts, Constantin Steppa, Igor Oya, Dominik Neise
https://arxiv.org/abs/2508.20726

On the Transients Handler for the Cherenkov Telescope Array Observatory
The Cherenkov Telescope Array Observatory (CTAO) is a next-generation gamma-ray observatory in both the Southern (Paranal, Chile) and Northern Hemisphere (La Palma, Spain) and will consist of up to 100 imaging atmospheric Cherenkov telescopes. With sensitivity far exceeding current facilities, CTAO will provide detailed measurements of gamma rays from GeV up to a few 100s of TeV. CTAO has a nominal field of view of 10° and will rely on external alerts from observatories such as IceCube (neutri…

Photometry with the new 1.5-meter telescope of the Rozhen Observatory
E. Semkov, N. Petrov, M. Minev, M. Moyseev, D. Marchev, E. Ovcharov, J. Marti, I. E. Dimitrova, R. K. Zamanov
https://arxiv.org/abs/2508.18752

Photometry with the new 1.5-meter telescope of the Rozhen Observatory
The new 1.5~m telescope (AZ1500) is operating at the National Astronomical Observatory Rozhen, Bulgaria. This paper gives an overview of the telescope and presents a snapshot of the current performance. Science observations are under way, and we give brief highlights from a number of programs that have been enabled.

Hubble Space Telescope Imaging of Three Isolated Faint Dwarf Galaxies Beyond the Local Group: Pavo, Corvus A, and Kamino
Bur\c{c}in Mutlu-Pakdil, Michael G. Jones, David J. Sand, Denija Crnojevi\'c, Kai Herron, Jay Strader, Dennis Zaritsky, Paul Bennet, Alex Drlica-Wagner, Quinn O. Casey, Amandine Doliva-Dolinsky, Richard Donnerstein, Catherine E. Fielder, Laura C. Hunter, Annika H. G. Peter, Deepthi S. Prabhu, Kristine Spekkens

Hubble Space Telescope Imaging of Three Isolated Faint Dwarf Galaxies Beyond the Local Group: Pavo, Corvus A, and Kamino
We present new Hubble Space Telescope (HST) imaging of three recently discovered star-forming dwarf galaxies beyond the Local Group: Pavo, Corvus A, and Kamino. The discovery of Kamino is reported here for the first time. They rank among the most isolated faint dwarf galaxies known, hence they provide unique opportunities to study galaxy evolution at the smallest scales, free from environmental effects of more massive galaxies. Our HST data reach $\sim$2-4 magnitudes below the tip of the red gi…

Technique-agnostic exoplanet demography for the Roman era - I. Testing a retrieval framework using simulated Kepler-like transit datasets
Akshay Priyadarshi, Eamonn Kerins
https://arxiv.org/abs/2509.24401

Technique-agnostic exoplanet demography for the Roman era - I. Testing a retrieval framework using simulated Kepler-like transit datasets
The Nancy Grace Roman Space Telescope (Roman) will unveil for the first time the full architecture of planetary systems across Galactic distances through the discovery of up to 200,000 cool and hot exoplanets using microlensing and transit detection methods. Roman's huge exoplanet haul, and Galactic reach, will require new methods to leverage the full exoplanet demographic content of the combined microlensing and transit samples, given the different sensitivity bias of the techniques to planet …

Fermi-Large Area Telescope Detection of Very High Energy (>100 GeV) Emission from Misaligned Jetted Active Galactic Nuclei
Gunjan Tomar, Vaidehi S. Paliya, D. J. Saikia, C. S. Stalin
https://arxiv.org/abs/2508.15921

Fermi-Large Area Telescope Detection of Very High Energy (>100 GeV) Emission from Misaligned Jetted Active Galactic Nuclei
The detection of very-high-energy (VHE; $>$100 GeV) $γ$-ray radiation from misaligned jetted Active Galactic Nuclei (AGN) challenges the emission models that primarily explain VHE emissions from beamed AGN, i.e., blazars. Using over 16 years of \textit{Fermi}-Large Area Telescope (\textit{Fermi}-LAT) Pass 8 data in the energy range 0.1$-$2 TeV, we systematically explore the VHE emission from a recently published sample of 160 radio galaxies. We identify 12 sources detected at $>4σ$ confidence…

Technical Memo: The impact of Nancy Grace Roman Telescope's default image processing on the detectability of moving Solar system objects
Joseph Masiero (Caltech/IPAC)
https://arxiv.org/abs/2509.20469

Technical Memo: The impact of Nancy Grace Roman Telescope's default image processing on the detectability of moving Solar system objects
The Nancy Grace Roman Telescope is scheduled to launch in 2026 to conduct a wide-field survey of the sky at near-infrared wavelengths. Although Roman is unable to track objects moving at non-sidereal rates, there is recent interest in the potential capability of the telescope to support planetary defense by tracking and characterizing asteroids and comets (Holler et al, 2025, arXiv:2508.14412). However, the standard pipeline image processing scheme that the mission is planning to implement for …

SAG-SCI: the Real-time, High-level Analysis Software for Array Control and Data Acquisition of the Cherenkov Telescope Array Observatory
Gabriele Panebianco (INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Bologna, Italy), Nicol\`o Parmiggiani (INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Bologna, Italy), Andrea Bulgarelli (INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Bologna, Italy), Ambra Di Piano (INAF - Osserva…

SAG-SCI: the Real-time, High-level Analysis Software for Array Control and Data Acquisition of the Cherenkov Telescope Array Observatory
The Cherenkov Telescope Array Observatory (CTAO) is going to be the leading observatory for very-high-energy gamma-rays over the next decades. Its unique sensitivity, wide field of view, and rapid slewing capability make the CTAO especially suited to study transient astrophysical phenomena. The CTAO will analyse its data in real-time, responding to external science alerts on transient events and issuing its own. The Science Alert Generation (SAG) automated pipeline, a component of the Array Con…

Impact of Cosmic Filaments on Galaxy Morphological Evolution and Predictions of Early Cosmic Web Structure for Roman
Farhanul Hasan, Haowen Zhang, Viraj Pandya, Marc Rafelski, Joseph N. Burchett, Douglas Hellinger, Kalina V. Nedkova, Ilias Goovaerts, Nir Mandelker, Daisuke Nagai, Grecco A. Oyarz\'un, Joel R. Primack, Joanna Woo
https://

Impact of Cosmic Filaments on Galaxy Morphological Evolution and Predictions of Early Cosmic Web Structure for Roman
We leverage the IllustrisTNG cosmological simulations to test how the large-scale cosmic web shapes galaxy morphology and to forecast the early cosmic web structure that the Nancy Grace Roman Space Telescope will reveal. In the hydrodynamic TNG50 and $N$-body TNG50-Dark runs, we reconstruct the cosmic web at redshifts $z=0$, 0.5, 1, 2, 3, and 4 with the Monte Carlo Physarum Machine density estimator and the DisPerSE structure identification framework. We confirm that dark matter halos start out…

Witnessing Magnetic Reconnection in Tangled Superpenumbral Fibrils Around a Sunspot
Hechao Chen, Hui Tian, Eric R. Priest, Christopher B. Prior, Chun Xia, Anthony R. Yeates, Xiaoli Yan, Yadan Duan, Zhenyong Hou, Zhenghua Huang, Oliver E. K. Rice
https://arxiv.org/abs/2509.23636

Witnessing Magnetic Reconnection in Tangled Superpenumbral Fibrils Around a Sunspot
Three-dimensional magnetic reconnection is a fundamental plasma process crucial for heating the solar corona and generating the solar wind, but resolving and characterizing it on the Sun remains challenging. Using high-quality data from the Chinese New Vacuum Solar Telescope, the Solar Dynamics Observatory, and the Interface Region Imaging Spectrograph, this work presents highly suggestive direct imaging evidence of magnetic reconnection during the untangling of braided magnetic structures abov…

The Molecular Inventory of TMC-1 with GOTHAM Observations: #MolecularCloud

GroundBIRD Telescope: Systematics Modelization of MKID Arrays Response
Yonggil Jo, Alessandro Fasano, Eunil Won, Makoto Hattori, Shunsuke Honda, Chiko Otani, Junya Suzuki, Mike Peel, Kenichi Karatsu, Ricardo G\'enova-Santos, Miku Tsujii
https://arxiv.org/abs/2509.20285

GroundBIRD Telescope: Systematics Modelization of MKID Arrays Response
Kinetic inductance detectors are widely used in millimeter- and submillimeter-wave astronomy, benefiting from their fast response and relative ease of fabrication. The GroundBIRD telescope employs microwave kinetic inductance detectors at 145 and 220 GHz to observe the cosmic microwave background. As a ground-based telescope, it is subject to inherent environmental systematics, namely atmospheric emission and thermal fluctuations of the focal plane temperature. This study models resonance frequ…

The Terzina payload on board the NUSES space mission
Teresa Montaruli (for the NUSES Collaboration)
https://arxiv.org/abs/2509.23451 https://arxiv.org/pdf/…

The Terzina payload on board the NUSES space mission
The Terzina payload, onboard the NUSES space mission is being built in collaboration with TAS-I by GSSI, INFN and the University of Geneva. It is a Cherenkov Schmidt-Cassegrain compact telescope with an effective focal length of 925~mm and a camera focal assembly composed of 640 pixels (16 vertically and 40 horizontally) organized in $8\times 8$ tiles produced by FBK with sensitive area $2.73 \times 2.64$~mm$^2$. We will illustrate the performance for the signal of cosmic rays beyond a threshol…

FUMES IV: Optical and Far-ultraviolet Spectra of a Flare on the M Dwarf GJ 4334
Girish M. Duvvuri, J. Sebastian Pineda, Aylin Garc\'ia Soto, Zachory K. Berta-Thompson, Allison Youngblood, Kevin France, Elisabeth R. Newton, Keivan G. Stassun
https://arxiv.org/abs/2508.18459

FUMES IV: Optical and Far-ultraviolet Spectra of a Flare on the M Dwarf GJ 4334
On 2017-09-20 we observed GJ 4334, an M5V dwarf rotating with a period of 23.5 days, simultaneously with both the Space Telescope Imaging Spectrograph aboard Hubble (1160 -- 1710 Angstroms) and the Dual Imaging Spectrograph mounted on the 3.5m telescope at Apache Point Observatory (3750 -- 5050; 5800 -- 6950 Angstroms) as part of a larger survey of intermediately active M dwarfs. GJ 4334 flared during the observation, starting with a rise in the flux of optical chromospheric emission lines, fol…

Stray and Scattered Light Considerations in a Non-contiguous Array of Commercial CMOS Sensors in a Space Mission
Maggie Y. Kautz, Douglas Kelly, Heejoo Choi, Young Sik Kim, Fernando Coronado, Cameron C. Ard, Patrick Ingraham, Daewook Kim, Ewan S. Douglas
https://arxiv.org/abs/2508.21245

Stray and Scattered Light Considerations in a Non-contiguous Array of Commercial CMOS Sensors in a Space Mission
Recent advances in CMOS technology have potential to significantly increase the performance, at low-cost, of an astronomical space telescope. Arrays of sensors in space missions are typically contiguous and act as a monolithic detector. A non-contiguous array, with gaps between individual commercial CMOS detectors, offers potential cost and schedule benefits but poses a unique challenge for stray/scattered light mitigation due to complexities in the optomechanics. For example, if the array of d…

JWST Spectroscopy of GRB 250702B: An Extremely Rare and Exceptionally Energetic Burst in a Dusty, Massive Galaxy at $z=1.036$
Benjamin P. Gompertz, Andrew J. Levan, Tanmoy Laskar, Benjamin Schneider, Ashley A. Chrimes, Antonio Martin-Carrillo, Albert Sneppen, David ONeill, Daniele B. Malesani, Peter G. Jonker, Eric Burns, Gregory Corcoran, Laura Cotter, Antonio de Ugarte Postigo, Dimple, Rob A. J. Eyles-Ferris, L. Izzo, Pall Jakobsson, Gavin P. Lamb, Jesse T. Palmerio, Giovanna Puglie…

JWST Spectroscopy of GRB 250702B: An Extremely Rare and Exceptionally Energetic Burst in a Dusty, Massive Galaxy at $z=1.036$
We present follow-up observations of the day-long, repeating GRB 250702B with the Near Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST). Through the identification of narrow hydrogen emission lines at a consistent redshift of $z = 1.036 \pm 0.004$, we calibrate the distance scale, and therefore the energetics, of this unique extragalactic transient. At this distance, the resulting $γ$-ray energy release is at least $E_{γ,\rm iso} = 2.2 \times 10^{54}$\,erg. We fi…

35 years ago #OTD the #Hubble Space Telescope with its mishappen optics took this image of #Saturn - which could be sharpened a lot mathematically (as the paper https://articles.adsabs.harvard.edu/full/1991ApJ...369L..51W later described) since the object was so bright. It's being said that this one image was used by NASA to convince key U.S. politicians that the broken satellite still had some life in it ... and so it was, for 35 years now!

The Einstein Telescope Pathfinder and its Vacuum System
Thomas H\"ohn (ET-PF), Adrian Schwenck (ET-PF), Thomas Th\"ummler (ET-PF), Joachim Wolf (ET-PF), Ralph Engel (ET-PF), Andreas Haungs (ET-PF), Einstein Telescope Pathfinder (ET-PF), collaboration
https://arxiv.org/abs/2508.16461

The Einstein Telescope Pathfinder and its Vacuum System
The Einstein Telescope (ET) will be the next generation gravitational wave observatory in Europe with a sensitivity reaching beyond the CMB into the dark era of the Universe. Each corner of the triangular baseline design is the center of two interferometers with 10 km long arms, one operated at room temperature, the other one with mirrors at cryogenic temperatures of 10-15 K that reduce the noise contribution at frequencies as low as 3 Hz. The ETpathfinder (ET-PF) project at Maastricht Universi…

Interferometric inference of black hole spin from photon ring size and brightness
Joseph R. Farah, Alexandru Lupsasca, Eliot Quataert, Michael D. Johnson
https://arxiv.org/abs/2509.23628

Interferometric inference of black hole spin from photon ring size and brightness
The $n=1$ photon ring is a full image of the astrophysical source around a black hole, produced by photons that execute $n\approx1$ half-orbit around the event horizon on their way to an observer. The Black Hole Explorer (BHEX) is a proposed extension of the Event Horizon Telescope to space that will target the $n=1$ photon rings of the supermassive black holes M87${}^\ast$ and Sgr\,A${}^\ast$. In this paper, we introduce a new interferometric observable that will be directly measurable on BHEX…

Replaced article(s) found for astro-ph.IM. https://arxiv.org/list/astro-ph.IM/new
[1/1]:
- Six-telescope integrated optics beam combiner fabricated using ultrafast laser inscription for J-...
Dinkelaker, Smarzyk, Nayak, Piacentini, Corrielli, Osellame, Pedretti, Roth, Madhav

Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory
K. Abe, et al.
https://arxiv.org/abs/2508.19120 https://

Prospects for dark matter observations in dwarf spheroidal galaxies with the Cherenkov Telescope Array Observatory
The dSphs around the Milky Way are commonly considered as systems that are supported by velocity dispersion against self-gravitation. They have been long accounted among the best targets to search for indirect DM signatures in the GeV-to-TeV gamma-rays due to absence of astrophysical gamma-ray foreground or background emission. We present forecasts on the sensitivity of the future CTAO for the search for annihilating or decaying DM in such targets. We perform an original selection of candidates…

A Bibliometric Analysis of the Scholarly Impact of Early Subaru Telescope-based Publications
Hideaki Fujiwara
https://arxiv.org/abs/2508.18623 https://arxi…

A Bibliometric Analysis of the Scholarly Impact of Early Subaru Telescope-based Publications
Bibliometric methods provide valuable tools for assessing scientific productivity and impact across disciplines, yet their application in astronomy journals remains relatively limited. This study conducts a bibliometric analysis of Japanese astronomy publications before and after the commissioning of the Subaru Telescope, a major national investment in observational infrastructure. Using data from Scopus and SciVal, we examine peer-reviewed journal articles published between 1996 and 2007 by au…

Medium-scale anisotropies measured by Telescope Array surface detectors
Jihyun Kim (on behalf of the Telescope Array Collaboration), Dmitri Ivanov (on behalf of the Telescope Array Collaboration), Kazumasa Kawata (on behalf of the Telescope Array Collaboration), Hiroyuki Sagawa (on behalf of the Telescope Array Collaboration), Gordon Thomson (on behalf of the Telescope Array Collaboration)

Medium-scale anisotropies measured by Telescope Array surface detectors
The Telescope Array (TA) experiment, the largest observatory for ultra-high energy cosmic rays in the Northern Hemisphere, has identified two medium-scale anisotropies: the TA Hotspot near the constellation Ursa Major and an excess in the direction of the Perseus-Pisces supercluster. Studying these medium-scale anisotropies may provide insights into the origins of ultra-high energy cosmic rays. This presentation will explore an oversampling analysis of TA surface detector data to evaluate these…

Development and Potential of new Micro-Mirror Devices Optimized for Astronomy
Massimo Robberto (Space Telescope Science Institue, Johns Hopkins Univerisity), Cuiling Gong (Texas Christian University), Jim Huffman (Texas Christian University), Zoran Ninkov (Rochester Institute of Technology), Ivan Puchades (Rochester Institute of Technology), Mario Gennaro (Space Telescope Science Institue, Johns Hopkins Univerisity), Susan A. Kassin (Space Telescope Science Institue, Johns Hopkins Univ…

Development and Potential of new Micro-Mirror Devices Optimized for Astronomy
We introduce our new program to develop two-dimensional MEMS arrays of individually addressable micro-mirrors (''Micro-Mirror Devices'', MMDs) specifically optimized for astronomy, multi-slit spectroscopy in particular. After reviewing the main characteristics and performance of the currently available options, Micro Shutter Arrays by NASA/Goddard and Digital Micromirror Devices by Texas Instruments, we present our planned first generation/baseline devices with 30 micron x 30 miron pixel size a…

Comprehensive X-ray Observations of the Exceptional Ultra-long X-ray and Gamma-ray Transient GRB 250702B with Swift, NuSTAR, and Chandra: Insights from the X-ray Afterglow Properties
Brendan O'Connor, Ramandeep Gill, James DeLaunay, Jeremy Hare, Dheeraj Pasham, Eric R. Coughlin, Ananya Bandopadhyay, Akash Anumarlapudi, Paz Beniamini, Jonathan Granot, Igor Andreoni, Jonathan Carney, Michael J. Moss, Ersin G\"o\u{g}\"u\c{s}, Jamie A. Kennea, Malte Busmann, Simone Dichiara, …

Comprehensive X-ray Observations of the Exceptional Ultra-long X-ray and Gamma-ray Transient GRB 250702B with Swift, NuSTAR, and Chandra: Insights from the X-ray Afterglow Properties
GRB 250702B is an exceptional transient that produced multiple episodes of luminous gamma-ray radiation lasting for $>25$ ks, placing it among the class of ultra-long gamma-ray bursts (GRBs). However, unlike any known GRB, a soft X-ray precursor was discovered by the Einstein Probe up to 24 hours before the gamma-ray triggers. We present comprehensive X-ray observations of the transient's afterglow obtained with the Neil Gehrels Swift Observatory, the Nuclear Spectroscopic Telescope Array, and …

Simulating Image Coaddition with the Nancy Grace Roman Space Telescope. IV. Hyperparameter Optimization and Experimental Features
Kaili Cao, Christopher M. Hirata, Katherine Laliotis, Masaya Yamamoto, Emily Macbeth, M. A. Troxel
https://arxiv.org/abs/2509.18286

The new architecture design of the Science Alert Generation pipeline of the Cherenkov Telescope Array Observatory
ACADA Collaboration, Luca Castaldini (INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Bologna, Italy), Andrea Bulgarelli (INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Bologna, Italy), Vincent Pollet (Univ. Savoie Mont Blanc, CNRS, Laboratoire d'Annecy de Physique des Particules - IN2P3, Annecy, France), Gabriele Panebianco …

The new architecture design of the Science Alert Generation pipeline of the Cherenkov Telescope Array Observatory
The Cherenkov Telescope Array Observatory (CTAO) represents the next-generation gamma-ray observatory and will operate for several decades. It will be particularly suited to analyse transients and variable phenomena, which will trigger real-time scientific alerts. To support this, the Science Alert Generation (SAG) pipeline within the Array Control and Data Acquisition (ACADA) system will process data from telescope arrays in real time, using dedicated pipelines for data reconstruction (SAG-REC…

Prototyping of 6.2-mm-Pitch Fiber Positioner Modules for Stage-V Telescope Instrumentation
Malak Galal, Maxime Rombach, Jonathan Wei, Ricardo Ara\'ujo, Diane Chapuis, S\'ebastien Pernecker, Abby Bault, Joseph Harry Silber, Nicholas Wenner, William Van Shourt, Stefane Caseiro, Corentin Magnenat, David Schlegel, Jean-Paul Kneib
https://

Prototyping of 6.2-mm-Pitch Fiber Positioner Modules for Stage-V Telescope Instrumentation
Small-pitch populated focal planes are a critical enabling technology for the next generation of highly multiplexed astronomical instruments. This work reports on ongoing prototyping activities for 6.2 mm-pitch alpha-beta (theta-phi) fiber positioner modules. Following a concise review of the underlying concept, the performance of trillium-based and independently actuated robotic designs is compared. Key operational parameters including XY positioning repeatability, non-linearity, backlash, and…

CCAT: Mod-Cam Cryogenic Performance and its Impact on 280 GHz KID Array Noise
Lawrence T. Lin (Matt), Eve M. Vavagiakis (Matt), Jason E. Austermann (Matt), James R. Burgoyne (Matt), Scott Chapman (Matt), Steve K. Choi (Matt), Abigail T. Crites (Matt), Cody J. Duell (Matt), Rodrigo G. Freundt (Matt), Eliza Gazda (Matt), Christopher Groppi (Matt), Anthony I. Huber (Matt), Zachary B. Huber (Matt), Johannes Hubmayr (Matt), Ben Keller (Matt), Philip Mauskopf (Matt), Alicia Middleton (Matt),…

CCAT: Mod-Cam Cryogenic Performance and its Impact on 280 GHz KID Array Noise
The CCAT Observatory's Fred Young Submillimeter Telescope (FYST) is designed to observe submillimeter astronomical signals with high precision, using receivers fielding state-of-the-art kinetic inductance detector (KID) arrays. Mod-Cam, a first-light instrument for FYST, serves as a testbed for instrument module characterization, including detailed evaluation of thermal behavior under operating conditions prior to deploying modules in the larger Prime-Cam instrument. Prime-Cam is a first genera…

CCAT: Mod-Cam Readout Overview and Flexible Stripline Performance
Ben Keller (Matt), Rodrigo Freundt (Matt), James R. Burgoyne (Matt), Scott Chapman (Matt), Steve Choi (Matt), Cody J. Duell (Matt), Christopher Groppi (Matt), Caleb Humphreys (Matt), Lawrence T. Lin (Matt), Alicia Middleton (Matt), Michael D. Niemack (Matt), Darshan Patel (Matt), Eve Vavagiakis (Matt), Samantha Walker (Matt), Yuhan Wang (Matt), Ruixuan (Matt), Xie

CCAT: Mod-Cam Readout Overview and Flexible Stripline Performance
The CCAT Observatory's first-light and commissioning instrument, Mod-Cam, is nearing readiness for deployment to the Fred Young Submillimeter Telescope (FYST) in the Atacama Desert in northern Chile. In-lab testing of Mod-Cam and the first CCAT instrument module, a 280 GHz broadband camera fielding over 10,000 kinetic inductance detectors (KIDs), is currently underway. CCAT's first-generation science instrument, Prime-Cam, will field approximately 100,000 KIDs across seven instrument modules. L…

The AdvCam: Designing the future cameras for the Large-Sized Telescope of the Cherenkov Telescope Array Observatory
Matthieu Heller (for the CTAO-LST Project)
https://arxiv.org/abs/2509.12854

The AdvCam: Designing the future cameras for the Large-Sized Telescope of the Cherenkov Telescope Array Observatory
An international collaboration composed of Italian, Japanese, Spanish and Swiss institutes, is developing the advanced camera (AdvCam), the next-generation camera for Imaging Atmospheric Cherenkov Telescopes, designed specifically for the Large-Sized Telescopes (LST) of the Cherenkov Telescope Array Observatory. AdvCam incorporates cutting-edge Silicon Photomultipliers (SiPMs) and a fully digital readout system, setting new standards for performance and efficiency. The upgraded camera will feat…

Stages of commissioning alignment for three-mirror anastigmat (TMA) telescopes
Solvay Blomquist, Heejoo Choi, Hyukmo Kang, Hayden Kim, Kevin Derby, Pierre Nicolas, Joanna Rosenbluth, Patrick Ingraham, Ewan S. Douglas, Daewook Kim
https://arxiv.org/abs/2508.19338

Stages of commissioning alignment for three-mirror anastigmat (TMA) telescopes
Reliable, autonomously, deployment of telescopes enables a wide range of possible science cases. In this paper, we present a method for multi-stage telescope alignment with a simple commercial imaging sensor. For these studies, we use a design of an example three mirror anastigmat telescope and consider how the average spot size across the detector changes as a function of primary and secondary mirror positioning. This multi-stage alignment procedure will consist of three subprocesses, starting…

CHRONOS: Cryogenic sub-Hz cROss torsion bar detector with quantum NOn-demolition Speed meter
Yuki Inoue, Hsiang-Chieh Hsu, Hsiang-Yu Huang, M. Afif Ismail, Vivek Kumar, Miftahul Ma'arif, Avani Patel, Daiki Tanabe, Henry Tsz-King Wong, Da-Chun Yu
https://arxiv.org/abs/2509.23172

CHRONOS: Cryogenic sub-Hz cROss torsion bar detector with quantum NOn-demolition Speed meter
We propose a next-generation ground-based gravitational-wave detector, the Cryogenic sub-Hz cROss torsion-bar detector with quantum NOn-demolition Speed meter (CHRONOS), optimized for the unexplored 0.1-10Hz band bridging the gap between the space-based LISA and future ground-based detectors such as Cosmic Explorer and the Einstein Telescope. CHRONOS combines a ring-cavity Sagnac interferometer with torsion-bar test masses to realize the first quantum nondemolition (QND) measurement of angular …

Towards a foundation model for astrophysical source detection: An End-to-End Gamma-Ray Data Analysis Pipeline Using Deep Learning
Judit P\'erez-Romero, Saptashwa Bhattacharyya, Sascha Caron, Dmitry Malyshev, Rodney Nicolas, Giacomo Principe, Zoja Rokavec, Roberto Ruiz de Austri, Danijel Sko\v{c}aj, Fiorenzo Stoppa, Domen Tabernik, Gabrijela Zaharijas
https:…

Towards a foundation model for astrophysical source detection: An End-to-End Gamma-Ray Data Analysis Pipeline Using Deep Learning
The increasing volume of gamma-ray data demands new analysis approaches that can handle large-scale datasets while providing robustness for source detection. We present a Deep Learning (DL) based pipeline for detection, localization, and characterization of gamma-ray sources. We extend our AutoSourceID (ASID) method, initially tested with \textit{Fermi}-LAT simulated data and optical data (MeerLICHT), to Cherenkov Telescope Array Observatory (CTAO) simulated data. This end-to-end pipeline demon…