Tootfinder

Commissioning and Testing of IceAct Telescopes at the IceCube Neutrino Observatory
Arun Vaidyanathan, Lars Heuermann
https://arxiv.org/abs/2509.09778 https://

Commissioning and Testing of IceAct Telescopes at the IceCube Neutrino Observatory
IceAct is an array of imaging air Cherenkov telescopes located at the ice surface above the IceCube Neutrino Observatory. Each telescope features a silicon photomultiplier based 61 pixel camera and a Fresnel-lens as imaging optic, resulting in a 12-degree field of view. The design is optimized to be operated in harsh environments, particularly at the South Pole. The setup will consist of seven telescopes in a so-called fly's eye configuration, increasing the field of view to 36^\circ, and an ad…

Discovering Cataclysmic Variables from the Rubin Observatory LSST
D. A. H. Buckley (South African Astronomical Observatory, University of the Free State, University of Cape Town), Y. Tampo (South African Astronomical Observatory, University of Cape Town), P. Szkody (University of Washington), M. Motsoaledi (University of Cape Town), S. Scaringi (Durham University, INAF-Osservatorio Astronomico di Cap), M. Lochner (University of the Western Cape), N. Rawat (South African Astronomical Ob…

Discovering Cataclysmic Variables from the Rubin Observatory LSST
The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) will provide a windfall of new transients and variable sources. Here we have performed mock observation simulations to understand LSST's expected detection rates for cataclysmic variables (CVs) with known large amplitude variations. Under the thin-disk approximation for the distribution of CVs in our Galaxy, we found that only 20% of WZ Sge-type dwarf novae systems, representing the most energetic disk-driven outbursts in CV…

The Doppler boosted LISA response to gravitational waves
Tom van der Steen, Henri Inchausp\'e, Thomas Hertog, Aur\'elien Hees
https://arxiv.org/abs/2509.10038 https://…

The Doppler boosted LISA response to gravitational waves
The future space-based gravitational wave observatory LISA is expected to detect massive black hole binaries (MBHBs) with high signal-to-noise ratios (SNRs), ranging up to thousands. Such high-precision observations require accurate modeling of the detector response. However, current derivations of the response function neglect the motion of the spacecraft during light travel time, omitting velocity-dependent terms of order $β= v/c \sim 10^{-4}$. In this work, we derive the velocity-dependent …

Second Discovery of GeV-TeV Connection from the Globular Cluster UKS 1
Jiwon Shin (Chungnam National University), C. Y. Hui (Chungnam National University), Sangin Kim (Chungnam National University), Kwangmin Oh (Michigan State University), Ellis R. Owen (RIKEN, Osaka University)
https://arxiv.org/abs/2510.11215

Second Discovery of GeV-TeV Connection from the Globular Cluster UKS 1
Using 16 years of data collected by Fermi Large Area Telescope and 1523 days of survey data from High Altitude Water Cherenkov (HAWC) Observatory, we discovered the long-sought second GeV-TeV connection towards the globular cluster (GC) UKS 1 (Shin et al. 2025). Gamma-ray spectroscopy suggests that the GeV emission can be attributed to both the pulsar magnetosphere and inverse Compton scattering (ICS) by the pulsar wind. In particular, the TeV peak is displaced from the cluster center by severa…

Leveraging Photometry for Deconfusion of Directly Imaged Multi-Planet Systems
Samantha N. Hasler, Leonid Pogorelyuk, Riley Fitzgerald, Kerri Cahoy, Rhonda Morgan
https://arxiv.org/abs/2510.09841

Leveraging Photometry for Deconfusion of Directly Imaged Multi-Planet Systems
Planned and future missions, including the Habitable Worlds Observatory (HWO), will aim to directly image Earth-like exoplanets around Sun-like stars in reflected light. Determining whether an exoplanet is in the habitable zone of its star may be difficult in multi-planet systems when the observer does not know in advance which point source detection corresponds to which planet. This "confusion" problem will be a concern for future missions due to the high occurrence rate of multi-planet system…

Radial Velocity Monitoring and Analysis of Gaia Astrometry of Selected Intermediate Mass Stars to Constrain Their Multiplicity Status
J. B\"atz, M. Mugrauer, K. -U. Michel, J. Reichert, A. Tschirschky, L. Pietsch, F. Edelmann, R. Neuh\"auser
https://arxiv.org/abs/2510.09772

Radial Velocity Monitoring and Analysis of Gaia Astrometry of Selected Intermediate Mass Stars to Constrain Their Multiplicity Status
We present new radial velocity measurements of 13 selected intermediate mass stars (2 - 6 M$_\odot$). The measurements were performed between 29 April and 6 September 2024 at the University Observatory Jena using the échelle spectrograph FLECHAS. The radial velocity of eight stars was found to be constant during our spectroscopic monitoring, namely: 17 Dra A, HD 148374, HD 169487 A, 57 Cnc, $γ$ And, HD 11031, $κ$ And, and $λ$ Cas. In contrast, the radial velocity of five stars showed signif…

Energy calibration of LHAASO-KM2A using the cosmic ray Moon shadow
Ali Raza, Huihai He, Faisal Akram, The LHAASO Collaboration
https://arxiv.org/abs/2510.12649 https://

Energy calibration of LHAASO-KM2A using the cosmic ray Moon shadow
We present a precise measurement of the westward, rigidity-dependent shift of the Moon's shadow using three and a half years of cosmic-ray data collected by the Kilometer Square Array (KM2A) of the Large High Altitude Air Shower Observatory (LHAASO). These measurements enable us to calibrate the detector energy response in the range 20-260 TeV, with results showing excellent agreement with the response derived from Monte Carlo (MC) simulations of the KM2A detector. We also measure a best-fit pa…

Progress toward a demonstration of high contrast imaging at ultraviolet wavelengths
Kyle Van Gorkom, Ramya M. Anche, Christopher B. Mendillo, Jessica Gersh-Range, G. C. Hathaway, Saraswathi Kalyani Subramanian, Justin Hom, Tyler D. Robinson, Mamadou N'Diaye, Nikole K. Lewis, Bruce Macintosh, Ewan S. Douglas
https://arxiv.org/abs/2509.0…

Progress toward a demonstration of high contrast imaging at ultraviolet wavelengths
NASA's Habitable Worlds Observatory (HWO) aims to achieve starlight suppression to the $10^{-10}$ level for the detection and spectral characterization of Earth-like exoplanets. Broadband ozone absorption features are key biosignatures that appear in the 200-400nm near-ultraviolet (UV) regime. Extending coronagraphy from visible wavelengths to the UV, however, brings with it a number of challenges, including tighter requirements on wavefront sensing and control, optical surface quality, scatter…

The X-ray Source Population of the Metal-Rich Globular Cluster NGC 6528
Bernard Leal, Kwangmin Oh, Jay Strader, Steve E. Zepf, Kristen Dage, S. Kim, C. Y. Hui
https://arxiv.org/abs/2508.10105

The X-ray Source Population of the Metal-Rich Globular Cluster NGC 6528
We present the first study of the X-ray sources in one of the most metal-rich globular clusters in the Galaxy, NGC 6528. Using relatively deep (66 ksec) archival imaging from the Chandra X-ray Observatory, we identify 18 sources within the half-light radius of the cluster, all in the range $L_X \sim 10^{31}$-$10^{32}$erg s$^{-1}$ (0.5-7 keV). By combining these data with photometry from the Hubble Space Telescope and other sources, we classify the X-ray sources as a likely mix of cataclysmic va…

A multi-wavelength view of the multi-messenger sources NGC 1068 and PKS 1502 1061
Abhishek Desai, Stefano Marchesi, Justin Vandenbroucke, Indrani Pal, Ke Fang, Dieter Hartmann, Regina Caputo, Marco Ajello, Jessie Thwaites, Kavic R Kumar, Sam Hori
https://arxiv.org/abs/2508.10194

A multi-wavelength view of the multi-messenger sources NGC 1068 and PKS 1502+1061
Multi-messenger astronomy offers a powerful approach to studying high-energy radiative processes in astrophysical sources. A notable example was seen in 2017, when the IceCube Neutrino Observatory detected a high-energy neutrino event that was found to coincide with a gamma-ray flare from a blazar. Since then, numerous multi-messenger studies combining neutrino and photon data have been conducted, yet the origin of neutrinos from active galactic nuclei (AGN) remains uncertain. In this work, we …