Tootfinder

400 years ago #OTD the astronomer Giovanni Domenico Cassini a.k.a. #Cassini I (because they would become an astro-dynasty) was born: while #meridiana of Bologna: https://en.wikipedia.org/wiki/San_Petronio,_Bologna

Electrically reconfigurable extended lasing state in an organic liquid-crystal microcavity
Dmitriy Dovzhenko (School of Physics and Astronomy, University of Southampton, Southampton, United Kingdom), Luciano Siliano Ricco (Science Institute, University of Iceland, Reykjavik, Iceland), Krzysztof Sawicki (School of Physics and Astronomy, University of Southampton, Southampton, United Kingdom), Marcin Muszy\'nski (Institute of Experimental Physics, Faculty of Physics, University of Wa…

Electrically reconfigurable extended lasing state in an organic liquid-crystal microcavity
Small-footprint, low-power arrays of coupled coherent emitters with the capability of near- and far-field engineering and coherence control are highly sought after to meet modern nanophotonics evolving needs. Between existing solutions based on vertical-cavity surface-emitting lasers, phase masks in bulk traditional cavity-based systems, and lattices of exciton-polariton condensates, only the strongly light-matter coupled systems were shown to be capable of controlled on-chip interaction betwee…

Metasurface-Enabled Astronomical Polarimetry
Lisa W. Li, Phillip H. H. Oakley, Rebecca N. Schindhelm, Sean G. Sellers, Roberto Casini, Noah A. Rubin
https://arxiv.org/abs/2506.06245

Metasurface-Enabled Astronomical Polarimetry
In the last decade or so, metasurface optical components have received considerable scientific and industrial interest for a variety of applications. The miniaturization afforded by metasurfaces could benefit astronomy in particular (which is an often-cited potential application area for metasurfaces). However, few developed examples in which metasurface components offer a unique benefit to astronomical instrumentation - substantiated by the production of scientific data - have been shown. Here…

Galactic Science -- Rapporteur Talk of the 8th Heidelberg International Symposium on High Energy Gamma Ray Astronomy
Sandro Mereghetti (INAF, IASF-Milano)
https://arxiv.org/abs/2506.04729

Galactic Science -- Rapporteur Talk of the 8th Heidelberg International Symposium on High Energy Gamma Ray Astronomy
The most recent observational and theoretical results in the rapidly expanding field of high-energy gamma-ray astrophysics were discussed at the international conference ``Gamma-2024'' that took place in Milano in September 2024. This contribution summarises the 'rapporteur talk' relative to the Galactic science given at the end of the conference.

Thousands of satellites with incredibly short lifetimes are being sent up into low Earth orbit.
When they fall back down they're fireballs of pollution — and what doesn't burn up hits the ground
https…

What goes up must come down: How megaconstellations like SpaceX's Starlink network pose a grave safety threat to us on Earth
Thousands of satellites with incredibly short lifetimes are being sent up into low Earth orbit. When they fall back down they're fireballs of pollution — and what doesn't burn up hits the ground.

"Patricia #Espenak announced in an email that Fred passed away yesterday afternoon," Michael Zeiler just wrote on the Solar Eclipse Mailing List: "Fred was in hospice at their home in Portal, Arizona. Pat was holding his hand when he passed away and is devastated.
Fred had an extremely consequential life and was a giant in the solar eclipse community. Let‘s remember his enthusiasm for nature‘s greatest spectacle, his warm friendship to many of us, his generosity in sharing his knowledge, and his impact on all of us."
Obituaries: https://skyandtelescope.org/astronomy-news/fred-espenak-1953-2025/ and https://www.astronomy.com/observing/fred-espenak-dies-at-71/

Heck of a moon tonight! 🌙 #moon #astrophotography #astronomy

Inferring Obscured Cosmic Black Hole Accretion History from AGN Found by JWST/MIRI CEERS Survey
C. -A. Hsieh (Department of Physics, National Taiwan University), T. Goto (Institute of Astronomy, National Tsing Hua University, Department of Physics, National Tsing Hua University), C. -T. Ling (Institute of Astronomy, National Tsing Hua University), S. J. Kim (Institute of Astronomy, National Tsing Hua University), T. Hashimoto (Department of Physics, National Chung Hsing University), T.…

Inferring Obscured Cosmic Black Hole Accretion History from AGN Found by JWST/MIRI CEERS Survey
This study presents the black hole accretion history (BHAH) of obscured active galactic nuclei (AGNs) identified from the JWST CEERS survey by Chien et al. (2024) using mid-infrared (MIR) SED fitting. We compute black hole accretion rates (BHARs) to estimate the black hole accretion density (BHAD), $ρ_{L_{\mathrm{disk}}}$, across $0 < z < 4.25$. MIR luminosity functions (LFs) are also constructed for these sources, modeled with modified Schechter and double power law forms, and corresponding B…

Trust the process: mapping data-driven reconstructions to informed models using stochastic processes
Stefano Rinaldi, Alexandre Toubiana, Jonathan R. Gair
https://arxiv.org/abs/2506.05153

Trust the process: mapping data-driven reconstructions to informed models using stochastic processes
Gravitational-wave astronomy has entered a regime where it can extract information about the population properties of the observed binary black holes. The steep increase in the number of detections will offer deeper insights, but it will also significantly raise the computational cost of testing multiple models. To address this challenge, we propose a procedure that first performs a non-parametric (data-driven) reconstruction of the underlying distribution, and then remaps these results onto a …

Trump threatens to eviscerate NASA (Philip Plait/Bad Astronomy Newsletter)
https://badastronomy.beehiiv.com/p/trump-threatens-to-eviscerate-nasa-cb96
http://www.memeorandum.com/250602/p138#a250602p138

Applying the Principles of Universal Design to Make Astronomy More Accessible
Amanda Quirk, Tom Rice
https://arxiv.org/abs/2505.23498 https://

Applying the Principles of Universal Design to Make Astronomy More Accessible
Universal Design (UD), an approach to accessibility that was first conceptualized in architecture to make buildings physically accessible, has since been applied to curriculum design to make classrooms accessible for a larger range of learning needs. In this paper, we illustrate how the concepts of UD are relevant outside of architecture and the creation of curricula by highlighting examples of norms that exist in the field of astronomy that create barriers for disabled folks. we discuss ways t…

❄️ Did it rain or snow on ancient Mars? New study suggests it did
#mars

Did it rain or snow on ancient Mars? New study suggests it did
Visit ancient Mars—a surprisingly temperate planet where snow or rain falls from the sky, and rivers rush down valleys to feed hundreds of lakes.

A Correlation Between FRB Dispersion Measure and Foreground Large-Scale Structure
Maryam Hussaini, Liam Connor, Ralf M. Konietzka, Vikram Ravi, Jakob Faber, Kritti Sharma, Myles Sherman
https://arxiv.org/abs/2506.04186

A Correlation Between FRB Dispersion Measure and Foreground Large-Scale Structure
The distribution of baryons in the Universe remains a fundamental open question in astronomy, and the dispersion measure (DM) of Fast Radio Bursts (FRBs) serves as a valuable tool for probing this cosmic gas. We investigate the impact of the foreground cosmic web on FRB DMs using 61 localized FRBs and public galaxy catalogs. We test for the large-scale structure's impact on cosmological DM using two methods. First, we searched for a correlation between galaxy number density along the line of si…

Faced with the growing risk that #LightPollution represents for the development of astronomy in Chile, international observatories with a presence in the country have formed a joint organization dedicated to protecting the dark skies of northern Chile: https://giantmagellan.org/2025/06/03/dark-skies-council-international-astronomical-observatories-join-forces-to-protect-chiles-skies/ - the Association of Universities for Research in Astronomy (AURA), the Giant Magellan Telescope, the European Southern Observatory (ESO) and Carnegie Science’s Las Campanas Observatory (LCO), signed an agreement to create the Dark Skies Council; through this alliance, the institutions will work in a coordinated manner to protect Chile’s privileged skies.

New long-period transient #LPT space object detected. It is the first one of which we know it is pulsing in both radio frequencies and X-ray bursts. Why? More research required. Still a fascinating object!
https://www.icrar.org/xray-tr…

Sieste, jour 3. On va essayer de récupérer de la courte nuit (3h de sommeil) Toujours pas d'orage, on cuit en attendant.
#RAP2025 #Astrodon #StarParty

Sorcha: A Solar System Survey Simulator for the Legacy Survey of Space and Time
Stephanie R. Merritt, Grigori Fedorets, Megan E. Schwamb, Samuel Cornwall, Pedro H. Bernardinelli, Mario Juric, Matthew J. Holman, Jacob A. Kurlander, Siegfried Eggl, Drew Oldag, Maxine West, Jeremy Kubica, Joseph Murtagh, R. Lynne Jones, Peter Yoachim, Ryan R. Lyttle, Michael S. P. Kelley, Joachim Moeyens, Kathleen Kiker, Shantanu P. Naidu, Colin Snodgrass, Shannon M. Matthews, Colin Orion Chandler

Sorcha: A Solar System Survey Simulator for the Legacy Survey of Space and Time
The upcoming Legacy Survey of Space and Time (LSST) at the Vera C. Rubin Observatory is expected to revolutionize solar system astronomy. Unprecedented in scale, this ten-year wide-field survey will collect billions of observations and discover a predicted $\sim$5 million new solar system objects. Like all astronomical surveys, its results will be affected by a complex system of intertwined detection biases. Survey simulators have long been used to forward-model the effects of these biases on a…

This https://arxiv.org/abs/2412.09699 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Neutrinos from explosive transients at the dawn of multi-messenger astronomy
With the advent of time-domain astronomy and the game-changing next generation of telescopes, we have unprecedented opportunities to explore the most energetic events in our Universe through electromagnetic radiation, gravitational waves, and neutrinos. These are elementary particles, which exist in three different flavors and change the latter as they propagate in the dense core of astrophysical sources as well as en route to Earth. To capitalize on existing and upcoming multi-messenger opport…

Nonlinear Stability and Dynamics of Supersonic Compressible Flows
Symphony Chakraborty (Institute of Astronomy,Astrophysics, Academia Sinica), Hsien Shang (Institute of Astronomy,Astrophysics, Academia Sinica)
https://arxiv.org/abs/2505.21650

Nonlinear Stability and Dynamics of Supersonic Compressible Flows
The study of shear layer instability in compressible flows is key to understanding phenomena from aerodynamics to astrophysical jets. Blumen's seminal paper [``Shear layer instability of an inviscid compressible fluid," J. Fluid Mech. {\bf 40}, 769--781 (1970)] established a linear stability framework for inviscid compressible shear flows, emphasizing velocity gradients and compressibility effects. However, the nonlinear regime remains insufficiently explored. This research extends Blumen's fra…

Shadow constraints of charged black hole with scalar hair and gravitational waves from extreme mass ratio inspirals
Lai Zhao, Meirong Tang, Zhaoyi Xu
https://arxiv.org/abs/2506.04971

Shadow constraints of charged black hole with scalar hair and gravitational waves from extreme mass ratio inspirals
Black hole (BH) shadow observations and gravitational wave astronomy have become crucial approaches for exploring BH physics and testing gravitational theories in extreme environments. This paper investigates the charged black hole with scalar hair (CBH-SH) derived from the Einstein-Maxwell-conformal coupled scalar (EMCS) theory. We first constrain the parameter space $(Q/M, s/M^2)$ of the BH using the Event Horizon Telescope (EHT) observations of M87* and Sgr A*. The results show that M87* pro…

Legacy of Avicenna in Astronomy
Rizoi Bakhromzod
https://arxiv.org/abs/2505.18219 https://arxiv.org/pdf/2505.18219

Legacy of Avicenna in Astronomy
The paper reassesses the largely neglected contribution of Avicenna (Ibn Sina, 980-1037) to medieval Tajik-Persian astronomy. Drawing on published primary and secondary sources, it reconstructs the main directions of his scientific activity - the construction of an observatory at Isfahan, the design of a high-precision angular instrument that anticipates the modern vernier principle, the formulation of an original method for determining terrestrial longitude from lunar culmination, a systematic…

The future of gravitational wave science unlocking LIGO potential: AI-driven data analysis and exploration
Yong Xiao, Li, Zin Nandar Win, He Wang, Hla Myo Tun, Win Thu Zar
https://arxiv.org/abs/2506.04584

The future of gravitational wave science unlocking LIGO potential: AI-driven data analysis and exploration
The advent of gravitational wave astronomy (GW) has revolutionized the observation of cataclysmic cosmic events, such as black hole mergers and neutron star collisions. The Laser Interferometer Gravitational-Wave Observatory (LIGO) has been at the forefront of these discoveries. However, the immense volume and complexity of gravitational wave data present significant challenges for traditional analysis methods. This paper investigates the growing synergy between artificial intelligence (AI) and…

The Growing Impact of Unintended #Starlink Broadband Emission on Radio Astronomy in the SKA-Low Frequency Range: https://arxiv.org/abs/2506.02831 -> "We report 112,534 individual detections of 1,806 unique Starlink satellites, some emitting broadband emission and others narrowband emission. [...] It is shown that in the worst cases, some datasets have a detectable Starlink satellite in ~30% of all images acquired. Emission from Starlink satellites is detected in primary and secondary frequency ranges protected by the International Telecommunication Union".

Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO
SWGO Collaboration, et al.
https://arxiv.org/abs/2506.01786 https://

Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO
Ground-based gamma-ray astronomy is now well established as a key observational approach to address critical topics at the frontiers of astroparticle physics and high-energy astrophysics. Whilst the field of TeV astronomy was once dominated by arrays of atmospheric Cherenkov Telescopes, ground-level particle detection has now been demonstrated to be an equally viable and strongly complementary approach. Ground-level particle detection provides continuous monitoring of the overhead sky, critical…

The Growing Impact of Unintended Starlink Broadband Emission on Radio Astronomy in the SKA-Low Frequency Range
Dylan Grigg, Steven Tingay, Marcin Sokolowski
#toXiv_bot_toot

This https://arxiv.org/abs/2504.09460 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Imprints of extra dimensions in eccentric eccentric extreme-mass-ratio inspirals gravitational waveforms
Studies regarding extra-dimensions have been of great interest in modern theoretical physics, including their observational consequences from future gravitational wave (GW) observatories. In this direction, extreme-mass-ratio inspirals (EMRIs), attracting considerable interest in GW astronomy and fundamental physics, can potentially provide a useful platform for the search of extra dimensions. In this paper, we examine a rotating braneworld black hole in the context of equatorial eccentric EMRI…

Evidence of haze control of Pluto’s atmospheric heat balance from JWST/MIRI thermal light curves: #Pluto

Core-collapse supernova parameter estimation with the upcoming Vera C. Rubin Observatory
Andrea Simongini, F. Ragosta, I. Di Palma, S. Piranomonte
https://arxiv.org/abs/2506.04184

Core-collapse supernova parameter estimation with the upcoming Vera C. Rubin Observatory
The Vera Rubin Observatory's Legacy Survey of Space and Time (LSST) is expected to revolutionize time-domain optical astronomy as we know it. With its unprecedented depth, the LSST will survey the southern hemisphere sky, generating nearly 32 trillion observations over its nominal 10-year operation. Among these, approximately 10 million will be supernovae (SNe). These observations will uniquely characterize the SN population, enabling studies of known and rare SN types, detailed parameterizatio…

SCOTCH III: Complete search for Hypercompact HII regions in the fourth quadrant
A. L. Patel (Kent), J. S. Urquhart (Kent), A. Y. Yang (NAOC, Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences), L. K. Morgan (GBT), K. M. Menten (LJMU), M. A. Thompson (MPIfR), T. Moore (Leeds), I. Grozdanova (Kent), S. Khan (LJMU), T. Csengeri (Univ. Bordeaux)

SCOTCH III: Complete search for Hypercompact HII regions in the fourth quadrant
We present high-frequency (18-24 GHz) radio continuum observations towards 335 methanol masers, excellent signposts for young, embedded high-mass protostars. These complete the search for hypercompact HII (HCHII) regions towards young high-mass star-forming clumps within the fourth quadrant of the Galactic plane. HCHII regions are the earliest observable signatures of radio continuum emission from high-mass stars ionizing their surroundings, though their rarity and short lifetimes make them cha…

The near infrared airglow continuum conundrum. Constraints for ground-based faint object spectroscopy
J. K. M. Viuho (Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen, Jagtvej 155A, DK-2200, Copenhagen N, Denmark, Nordic Optical Telescope, Rambla Jose Ana Fernandez Perez 7, ES-38711 Brena Baja, Spain, Department of Physics and Astronomy, Aarhus University, Munkegade 120, DK-8000 Aarhus C, Denmark), J. P. U. Fynbo (Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen, Jagtvej 155A, DK-2200, Copenhagen N, Denmark), M. I. Andersen (Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen, Jagtvej 155A, DK-2200, Copenhagen N, Denmark)
#toXiv_bot_toot

Backscattering Study of Electrons from 0.1 to 3.4 MeV
M. Kanafani (Universit\'e de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen, UMR6534, France), X. Fl\'echard (Universit\'e de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen, UMR6534, France), O. Naviliat-Cuncic (Universit\'e de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen, UMR6534, France, Facility for Rare Isotope Beams and Department of Physics and Astronomy, Michigan State University, USA, International Research…

Backscattering Study of Electrons from 0.1 to 3.4 MeV
Benchmarking simulation codes for electron transport and scattering in matter is a crucial step for estimating uncertainties in many applications. However, experimental data for electron energies of a few MeV is scarce to make such comparisons. We report here the measurement and the quantitative analysis of backscattering probabilities of electrons in the energy range 0.1 to 3.4~MeV impinging on YAP:Ce scintillator. The setup consists of a $2\times 2π$ calorimeter which enables, in particular,…

This https://arxiv.org/abs/2504.09460 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Imprints of extra dimensions in eccentric eccentric extreme-mass-ratio inspirals gravitational waveforms
Studies regarding extra-dimensions have been of great interest in modern theoretical physics, including their observational consequences from future gravitational wave (GW) observatories. In this direction, extreme-mass-ratio inspirals (EMRIs), attracting considerable interest in GW astronomy and fundamental physics, can potentially provide a useful platform for the search of extra dimensions. In this paper, we examine a rotating braneworld black hole in the context of equatorial eccentric EMRI…

Objectif lune! #RAP2025 #Astrodon #StarParty #astronomy

Meta-heuristic design of a light-weight homologous backup structure of the primary reflector for the Large Submillimeter Telescope
Chihiro Imamura, Yoichi Tamura, Hiroaki Kawamura, Toshiaki Kimura, Akio Taniguchi, Mikio Kurita
#toXiv_bot_toot

This https://arxiv.org/abs/2505.16380 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

On the Identification of Exotic Compact Binaries with Gravitational Waves: a Phenomenological approach
Gravitational wave (GW) astronomy has been hailed as a gateway to discovering unexpected phenomena in the universe. Over the last decade there have been close to one hundred GW observations of compact-binary mergers. While these signals are largely consistent with mergers of binary black holes, binary neutron stars, or black hole-neutron star systems, some events suggest the intriguing possibility of binaries involving exotic compact objects (ECOs). Identifying and characterising an ECO merger …

Residual 1D CNN for Low SFR Surface Density Regression: A Design Note
Po-Chieh Yu
#toXiv_bot_toot

Chasing Serendipity: Tackling Transient Sources with Neutrino Telescopes
Lua F. T. Airoldi, Gustavo F. S. Alves, Yuber F. Perez-Gonzalez, Gabriel M. Salla, Renata Zukanovich Funchal
https://arxiv.org/abs/2505.24652

Chasing Serendipity: Tackling Transient Sources with Neutrino Telescopes
The discovery of ultra-high-energy neutrinos by IceCube marked the beginning of neutrino astronomy. Yet, the origin and production mechanisms of these neutrinos remain open questions. With the recent observation of the highest-energy neutrino event to date by the KM3NeT collaboration, transient sources - astrophysical objects that emit particles in brief, localized bursts - have emerged as promising candidates. In this work, we revisit the identification of such sources in IceCube and future ne…

Real-time Light Curve Classification Framework for the Wide Field Survey Telescope Using Modified Semi-supervised Variational Auto-Encoder
Yongling Tang, Lulu Fan, Zhen Wan, Yating Liu, Yan Lu
https://arxiv.org/abs/2506.01216

Real-time Light Curve Classification Framework for the Wide Field Survey Telescope Using Modified Semi-supervised Variational Auto-Encoder
Modern time-domain astronomy will benefit from the vast data collected by survey telescopes. The 2.5 m Wide Field Survey Telescope (WFST), with its powerful capabilities, is promising to make significant contributions in the era of large sky surveys. To harness the full potential of the enormous amount of unlabeled light curve data that the WFST will collect, we have developed a semisupervised light curve classification framework. This framework showcases several unique features. First, it is o…

Observation of the Crab Nebula with the Single-Mirror Small-Size Telescope stereoscopic system at low altitude
C. Alispach, A. Araudo, M. Balbo, V. Beshley, J. Bla\v{z}ek, J. Borkowski, S. Boula, T. Bulik, F. Cadoux, S. Casanova, A. Christov, J. Chudoba, L. Chytka, P. \v{C}echvala, P. D\v{e}dic, D. della Volpe, Y. Favre, M. Garczarczyk, L. Gibaud, T. Gieras, E. G{\l}owacki, P. Hamal, M. Heller, M. Hrabovsk\'y, P. Jane\v{c}ek, M. Jel\'inek, V. J\'ilek, J. Jury\v{s}ek, V. Kar…

Observation of the Crab Nebula with the Single-Mirror Small-Size Telescope stereoscopic system at low altitude
The Single-Mirror Small-Size Telescope (SST-1M) stereoscopic system is composed of two Imaging Atmospheric Cherenkov Telescopes (IACTs) designed for optimal performance for gamma-ray astronomy in the multi-TeV energy range. It features a 4-meter-diameter tessellated mirror dish and an innovative SiPM-based camera. Its optical system features a 4-m diameter spherical mirror dish based on the Davies-Cotton design, maintaining a good image quality over a large FoV while minimizing optical aberrati…

Automatic detection and characterization of random telegraph noise in sCMOS sensors
Arda \"Ozdo\u{g}ru (Czech Technical University in Prague, Jugosl\'avsk\'ych partyz\'an\r{u} 1580/3, 160 00, Prague, Czechia), Sergey Karpov (Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 00, Prague, Czechia), Asen Christov (Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 00, Prague, Czechia), Stanislav V\'itek (Czech Te…

Automatic detection and characterization of random telegraph noise in sCMOS sensors
Scientific CMOS (sCMOS) image sensors are a modern alternative to typical CCD detectors and are rapidly gaining popularity in observational astronomy due to their large sizes, low read-out noise, high frame rates, and cheap manufacturing. However, numerous challenges remain in using them due to fundamental differences between CCD and CMOS architectures, especially concerning the pixel-dependent and non-Gaussian nature of their read-out noise. One of the main components of the latter is the rand…

This https://arxiv.org/abs/2412.14775 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Energy and polarization based on-line interference mitigation in radio interferometry
Radio frequency interference (RFI) is a persistent contaminant in terrestrial radio astronomy. While new radio interferometers are becoming operational, novel sources of RFI are also emerging. In order to strengthen the mitigation of RFI in modern radio interferometers, we propose an on-line RFI mitigation scheme that can be run in the correlator of such interferometers. We combine statistics based on the energy as well as the polarization alignment of the correlated signal to develop an on-lin…