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Kilohertz quasiperiodic oscillations in short gamma-ray bursts
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Journal Article
Kilohertz quasiperiodic oscillations in short gamma-ray bursts
2023
Overview
Short gamma-ray bursts (GRBs) are associated with binary neutron star mergers, which are multimessenger astronomical events that have been observed both in gravitational waves and in the multiband electromagnetic spectrum
1
. Depending on the masses of the stars in the binary and on details of their largely unknown equation of state, a dynamically evolving and short-lived neutron star may be formed after the merger, existing for approximately 10–300 ms before collapsing to a black hole
2
,
3
. Numerical relativity simulations across different groups consistently show broad power spectral features in the 1–5-kHz range in the post-merger gravitational-wave signal
4
–
14
, which is inaccessible by current gravitational-wave detectors but could be seen by future third-generation ground-based detectors in the next decade
15
–
17
. This implies the possibility of quasiperiodic modulation of the emitted gamma rays in a subset of events in which a neutron star is formed shortly before the final collapse to a black hole
18
–
21
. Here we present two such signals identified in the short bursts GRB 910711 and GRB 931101B from archival Burst and Transient Source Experiment (BATSE) data, which are compatible with the predictions from numerical relativity.
Two signals identified in short gamma-ray bursts from archival Burst and Transient Source Experiment data show kilohertz quasiperiodic oscillations, implying the ringing of a hypermassive neutron star before collapsing to a black hole.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
