🔭 Category

astro-ph

1088 papers

Consistent Gas-Phase Temperatures and Metallicities from UV and Optical Nebular Emission: A Reliable Foundation from z=0 to Cosmic Dawn

This paper introduces a novel method using HeII emission lines to align UV and optical spectra of nearby galaxies, demonstrating that this approach enables consistent gas-phase temperature and metallicity measurements within 0.1 dex, thereby establishing a reliable foundation for studying star-forming galaxies from the local universe to cosmic dawn despite unresolved discrepancies in specific temperature indicators.

Erin Huntzinger, Yuguang Chen, Tucker Jones, Ryan Sanders, Peter Senchyna, Daniel P. Stark, Fabio Bresolin, Stephane Charlot, Jacopo Chevallard2026-03-09🔭 astro-ph

X-SORTER (X-ray Survey Of meRging clusTErs in Redmapper): X-ray and Spectroscopic Characterization of 12 Optically Selected Galaxy Cluster Merger Candidates

The X-SORTER program demonstrates that selecting redMaPPer galaxy clusters with low top BCG probability and significant BCG separation is an efficient method for identifying dynamically active, post-pericenter merger candidates, which were confirmed via new X-ray and spectroscopic observations to be ideal systems for constraining dark matter self-interactions.

Christopher Hopp, David Wittman, Rodrigo Stancioli, Zhuoran Gao, Faik Bouhrik, Scott Adler2026-03-09🔭 astro-ph

Weighing gas-rich starless halos: dark matter parameters inference from their gas distributions

This study demonstrates that by incorporating environmental density as a free parameter in Bayesian analyses of RELHIC gas distributions, researchers can robustly and unbiasedly infer the virial masses of individual starless dark matter halos, effectively overcoming mass-concentration degeneracies to establish a reliable framework for weighing these objects in future surveys.

Francesco Turini (University of Milano-Bicocca), Alejandro Benitez-Llambay (University of Milano-Bicocca)2026-03-09🔭 astro-ph

Vertical Structure of Protoplanetary Disks in Scattered Light: A large sample analysis

This paper presents a large-scale analysis of 92 protoplanetary disks using a new ellipse-fitting algorithm on VLT/SPHERE scattered-light images to derive vertical height profiles, revealing that while flared geometries are common, a single power-law model fails to describe the entire sample and significant correlations with system properties are only found in extended disks with radii exceeding 150 au.

J. Byrne, C. Ginski, R. F. van Capelleveen, N. Fitzgerald, A. Garufi, C. Coyne, C. Lawlor, D. McLachlan2026-03-09🔭 astro-ph

Exocomets of β\beta Pictoris II: Two dynamical families of exocomets simulated with REBOUND

Using REBOUND simulations, this study identifies two distinct dynamical families of exocomets in the β\beta Pictoris system—originating from the inner region via resonance with planet β\beta Pic c and from the outer system via chaotic scattering by the gas giants—which explains the observed bimodal radial velocity distribution and suggests differences in their volatile contents.

K. P. Jaworska, H. J. Hoeijmakers2026-03-09🔭 astro-ph

The continuum spectrum of nonrelativistic multi-frequency Proca stars

This paper presents a systematic study of the continuum spectrum of spherical multi-frequency Proca stars, demonstrating that they interpolate between discrete stationary states and that a subset of these configurations are linearly stable, with potential implications for determining particle spin in ultralight dark matter models.

Galo Diaz-Andrade, Alberto Diez-Tejedor, Jose Luis Medina-Garcia, Armando A. Roque2026-03-09🔭 astro-ph

Long-Integration Magnetar Burst Observatory (LIMBO): Instrument Summary and Early FRB Rate Constraints

The paper introduces the Long-Integration Magnetar Burst Observatory (LIMBO), a real-time radio transient detection system at Leuschner Radio Observatory, and reports its successful monitoring of the magnetar SGR 1935+2154, which yielded 12 candidate FRB detections and established a cumulative rate-fluence power-law slope of α≈−0.60\alpha \approx -0.60 for Galactic magnetar bursts.

Darby McCauley, Aaron Parsons, Wei Liu, Wenbin Lu, Dirk Wright, Dan Werthimer2026-03-09🔭 astro-ph

Thermal Electrons in an Ultra-Relativistic Shock Shape the Optical Afterglow of GRB 250702F

The rapid optical detection of GRB 250702F by the Ondřejov D50 telescope revealed a unique flare morphology that provides compelling evidence for thermal electrons in ultra-relativistic shocks, challenging standard non-thermal afterglow models and aligning with particle-in-cell simulation predictions.

Martin Jelínek, Annarita Ierardi, Filip Novotný, Gor Oganesyan, Biswajit Banerjee, Dimitrios Giannios, Sergey Karpov, Martin Topinka, Elias Kammoun, Jan Štrobl, Alberto J. Castro-Tirado2026-03-09🔭 astro-ph

A cationic carrier for diffuse interstellar band at 862.1 nm: Evidence from the skin effect in nearby diffuse-to-translucent clouds

By analyzing Gaia DR3 data across 12 nearby molecular clouds, this study identifies a unique "skin effect" signature in the 862.1 nm diffuse interstellar band within the Taurus cloud that supports the carrier being a cationic species, such as a polycyclic aromatic hydrocarbon or fullerene, with an estimated ionization potential of approximately 12.40 eV.

He Zhao, Lu Li2026-03-09🔭 astro-ph

Active regions and the large-scale magnetic field of solar cycle 24

This study utilizes surface flux transport modeling and randomized simulations to demonstrate that the non-random longitudinal distribution of active regions, particularly recurrent flux emergence in the southern hemisphere, significantly reinforced the large-scale equatorial magnetic field during the declining phase of solar cycle 24, while also showing that incorporating both axial and equatorial dipole components provides better constraints for model optimization than using the axial dipole alone.

Ismo Tähtinen, Timo Asikainen, Kalevi Mursula2026-03-09🔭 astro-ph

A search for optical counterparts in quiescent black hole X-ray transients

This paper presents ULTRACAM photometric observations and public survey data to identify optical counterparts for nine quiescent black hole X-ray transients, resulting in the first optical identifications and precise astrometry for four targets, refined coordinates for an active source, and magnitude limits for five others to constrain their companion star properties.

I. V. Yanes-Rizo, J. Casares, M. A. P. Torres, V. S. Dhillon, T. R. Marsh, M. Armas Padilla, P. G. Jonker, T. Muñoz-Darias, S. Navarro Umpiérrez, D. Steeghs2026-03-09🔭 astro-ph

SuperSNEC: Fast and Accurate Light Curve Production for Large Hydrodynamic Model Grids Using Adaptive Gridding

The paper introduces SuperSNEC, an accelerated version of the SuperNova Explosion Code that utilizes adaptive gridding and solver optimizations to generate accurate supernova light curves for large model grids in under two seconds per model, achieving high fidelity with low-resolution simulations and successfully reproducing observed events like SN 2020oi without requiring additional power sources.

Christoffer Fremling, K-Ryan Hinds2026-03-09🔭 astro-ph

Determination of the Height-Temperature Profile Above a Solar Active Region from Multi-Frequency Radio Observations

This paper presents and validates an iterative, regularized method for reconstructing the height-temperature profile of the solar atmosphere above active regions by analyzing multi-frequency gyroresonance radio observations from the RATAN-600 telescope, demonstrating its effectiveness in reproducing observed spectra with high accuracy.

T. I. Kaltman, A. G. Stupishin, G. A. Makoev2026-03-09🔭 astro-ph

Photodynamical modeling of TOI-4504 reveals its deeply resonant state and similarity to GJ 876

This paper presents a photodynamical analysis of the TOI-4504 system using new TESS data to reveal that its two giant planets have precessed into a deeply resonant, fully relaxed state with measurable eccentricities, demonstrating a striking dynamical similarity to the GJ 876 system despite their different host star masses.

J. M. Almenara, R. Mardling, A. Leleu, S. Udry, T. Forveille, X. Bonfils, F. Bouchy, C. Cadieux, J. Couturier, R. F. Díaz, Y. Eyholzer, E. Fontanet, T. Guillot, G. Hébrard, R. M. Hoogenboom, J. Korth, M. Lendl, A. Nigioni2026-03-09🔭 astro-ph

Fingerprints of Individual Supermassive Black Hole Binaries in Pulsar Timing Arrays

This paper demonstrates that individual supermassive black hole binaries produce distinct spatial correlation patterns in Pulsar Timing Array data, providing a robust geometric fingerprint that breaks degeneracies with stochastic backgrounds, significantly improves sky localization, and offers a reliable alternative to phase-coherent searches for identifying nanohertz gravitational-wave sources.

Chiara M. F. Mingarelli, Bjorn Larsen, Ellis Eisenberg, Qinyuan Zheng, Forrest Hutchison2026-03-09🔭 astro-ph

Searching for precessing binary systems with mode-by-mode filtering and marginalization

This paper introduces a novel search framework for precessing binary black hole systems in LIGO-Virgo-KAGRA data that utilizes mode-by-mode filtering, machine learning-based template reduction, and marginalization over harmonic signal-to-noise ratios to overcome the computational and statistical challenges of spin precession, ultimately increasing the sensitive search volume by approximately 10%.

Zihan Zhou, Digvijay Wadekar, Javier Roulet, Oryna Ivashtenko, Tejaswi Venumadhav, Tousif Islam, Ajit Kumar Mehta, Jonathan Mushkin, Mark Ho-Yeuk Cheung, Barak Zackay, Matias Zaldarriaga2026-03-09🔭 astro-ph

Case study of a national-level academic conference organised in hybrid mode at low cost

This paper presents a case study of the Astronomical Society of Australia's 2025 Annual Scientific Meeting, detailing the low-cost, hybrid organizational strategies, technical setups, and operational procedures employed to successfully integrate online and in-person attendance while sharing key lessons for future conference organizers.

Violet M. Harvey, Simon Lee, Bruce Dawson, Sabrina Einecke, Gavin Rowell2026-03-09🔭 astro-ph