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19922026
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472 papers · 1 filter

astro-ph.HE2026

Exploring Physics beyond the Standard Model from kHz-Gravitational-Wave Signals of Core-Collapse Supernovae

Kei Kotake, Takami Kuroda

Recent advances in multidimensional modeling of core-collapse supernovae (CCSNe) have enabled detailed predictions of high-frequency gravitational-wave (GW) signals, offering a new…

astro-ph.HE2026

Mass and Spin Growth of Very Massive Stars in Star Clusters Potentially Associated with Little Red Dots

Ataru Tanikawa, Masaru Shibata, Kunihito Ioka

Using gravitational -body simulations, we investigate the evolution of mass and spin for very massive stars (VMSs) in dense star clusters, which could subsequently evolve into L…

astro-ph.HE2026

Inferring host environment properties and gravitational-wave decay time from the eccentricity measurement of dynamically captured binaries

A. Vincent Paul, Parthapratim Mahapatra, Marc Favata +1

Dynamical capture in dense stellar environments is a promising channel for producing eccentric compact binary mergers. Although there have been no confident detections of eccentric…

astro-ph.HE2026

Fifteen new millisecond pulsars in 47 Tucanae

W. Chen, D. Risbud, P. C. C. Freire +16

47 Tucanae is one of the largest, brightest, and closest globular clusters to Earth. It hosts an exotic stellar population with stellar dynamics that indicate a complex evolution h…

astro-ph.HE2026

Pulsar Discoveries from the TRAPUM UHF Survey of Fermi-LAT Sources

Tinn Thongmeearkom, Colin J. Clark, Rene P. Breton +25

The Fermi Large Area Telescope (LAT) provides advantages for radio pulsar searches by enabling efficient target selection. We can confidently point radio telescopes to the position…

astro-ph.HE2026★ 2 cited

An updated constraint for the Gravitational Wave Background from the Gamma-ray Pulsar Timing Array

Serena Valtolina, Colin J. Clark, Rutger van Haasteren +5

Fermi LAT observations of gamma-ray pulsars can be used to build a pulsar timing array (PTA) experiment to search for gravitational wave (GW) signals at nanohertz frequencies. At t…

astro-ph.HE2026

A Candidate Open Cluster Pulsar: Timing Analysis of PSR J1922+3745 in NGC 6791

Xiao-Jin Liu, Ralph P. Eatough, Zhichen Pan +15

PSR J1922+3745 was recently identified as a radio pulsar toward the old open cluster NGC 6791, raising the prospect of the first pulsar associated with an open cluster. We report F…

astro-ph.HE2026★ 1 cited

Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions

D. Akl, S. Antier, H. Koehn +105

Most long gamma-ray bursts (GRBs) exhibit afterglows broadly consistent with external forward-shock emission, typically described by smooth broken power-law decays in the multiband…

astro-ph.HE2026★ 1 cited

Circular polarization of gravitational waves from magnetorotational supernovae

Shota Shibagaki, Tomoya Takiwaki, Kei Kotake +2

Context. Gravitational waves (GWs) provide a unique probe of the explosion mechanism of massive stars and the evolution of nascent proto-neutron stars (PNSs). Magnetorotational exp…

astro-ph.HE2026

Accurate and efficient simulation-based inference for massive black-hole binaries with LISA

Alice Spadaro, Jonathan Gair, Davide Gerosa +7

We develop an accurate simulation-based inference framework for high-mass () black-hole binaries observable by LISA. The method is implemented within th…

astro-ph.HE2026

Gravitational Wave Measurement of the - Intrinsic Scatter at High Redshift

Cayenne Matt, Kayhan Gültekin, Gabriella Agazie +109

The observed GWB spectrum is higher in amplitude than model predictions by a factor of 2-3. Using a semi-analytic model, we evaluate the effect of a high-scatter supermassive black…

astro-ph.HE2026

PSR J00247204ai: a massive, eccentric binary system in the globular cluster 47 Tucanae

D. Risbud, A. Ridolfi, P. C. C. Freire +9

In this paper we present PSR J00247204ai, a 13.026-ms binary pulsar recently discovered in the globular cluster 47 Tucanae by the MeerKAT radio telescope. This is the slowest sp…

astro-ph.HE2026★ 4 cited

Searching for Anisotropy in the Gravitational Wave Background Using the Parkes Pulsar Timing Array

Yiqin Chen, Shi-Yi Zhao, Zhi-Zhang Peng +17

In recent years, several pulsar timing array collaborations have reported evidence for a nanohertz gravitational wave background (GWB). Such a background signal could be produced b…

astro-ph.HE2026★ 4 cited

The hydrodynamics of stratified ultra-relativistic outflows and the origin of GRB X-ray plateaus

Gilad Sadeh, Kenta Hotokezaka, Masaru Shibata

The origin of the X-ray plateau phase observed in a large fraction of gamma-ray burst afterglows remains debated. We present a novel analytic framework for the hydrodynamics of ult…

astro-ph.HE2026★ 1 cited

Inferring the population properties of galactic binaries from LISA's stochastic foreground

Federico De Santi, Alessandro Santini, Alexandre Toubiana +2

Galactic binaries are expected to be the most numerous LISA sources and to produce a stochastic gravitational-wave foreground whose spectral shape encodes information about the und…

astro-ph.HE2026★ 1 cited

Timing Gamma-ray Pulsars using Gibbs Sampling

Colin J. Clark, Serena Valtolina, Lars Nieder +1

Timing analyses of gamma-ray pulsars in the Fermi Large Area Telescope data set can provide sensitive probes of many astrophysical processes, including timing noise in young pulsar…

astro-ph.HE2026★ 1 cited

Probing millisecond magnetar formation in binary neutron star mergers through X-ray follow-up of gravitational wave alerts

Clara Plasse, Alexis Reboul-Salze, Jérome Guilet +5

The nature of the remnant of a binary neutron star (BNS) merger is uncertain. Though certainly a black hole (BH) in the cases of the most massive BNSs, X-ray lightcurves from gamma…

astro-ph.HE2025

Discovery of two new millisecond pulsars towards the Galactic bulge

J. Berteaud, F. Calore, M. Clavel +13

The mysterious Galactic Center Excess of gamma rays could be explained by a large population of millisecond pulsars hiding in the Galactic bulge, too faint to be detected as indivi…

astro-ph.HE2025★ 1 cited

The TRAPUM Large Magellanic Cloud pulsar survey with MeerKAT II: 12 new discoveries and timing solutions for 7 pulsars

V. Prayag, L. Levin, M. Geyer +15

We report the discovery of 12 new radio pulsars in the Large Magellanic Cloud (LMC) as part of the TRAPUM (TRAnsients and PUlsars with MeerKAT) Large Survey Project, using the Meer…

astro-ph.HE2025★ 1 cited

Optical Study of TRAPUM Pulsars and Modelling of the Redbacks: PSR J10364353 and PSR J18036707

A. Phosrisom, R. P. Breton, C. J. Clark +12

The Transients and Pulsars with MeerKAT (TRAPUM) project discovered eight binary millisecond pulsars in its first shallow \textit{L}-band survey of unidentified \textit{Fermi} -…

astro-ph.HE2025★ 5 cited

Astrophysical Implications of Eccentricity in Gravitational Waves from Neutron Star-Black Hole Binaries

Isobel Romero-Shaw, Jakob Stegmann, Gonzalo Morras +2

The gravitational-wave signal from the neutron star-black hole (NSBH) merger GW200105 is consistent with this binary having significant orbital eccentricity close to merger. This r…

astro-ph.HE2025★ 1 cited

Frequency- and phase-resolved polarimetry of millisecond pulsars and its application to timing

Małgorzata Curyło, Andrew Zic, Shuangqiang Wang +16

Pulsar timing is used for a variety of applications including tests of fundamental physics, probing the structure of neutron stars, and detecting nanohertz gravitational waves. Dev…

astro-ph.HE2025

Data span and frequency coverage requirements for robust detection and inference in PTAs: A case study with EPTA DR2

Irene Ferranti, Mikel Falxa, Federico Fantoccoli +2

Pulsar Timing Arrays (PTAs) are approaching the sensitivity required for a detection of the nanohertz stochastic gravitational-wave background (GWB). This makes it crucial to…

astro-ph.HE2025★ 34 cited

GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-Spin Black Hole Coalescence

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1783

We report the observation of gravitational waves from two binary black hole coalescences during the fourth observing run of the LIGO--Virgo--KAGRA detector network, GW241011 and GW…