Physics at Virginia

"Hypermassive neutron stars and short gamma ray bursts"

Cecilia Chirenti , University of Maryland
[Host: Kent Yagi]

Gamma ray bursts (GRBs) are the most luminous electromagnetic events in the universe. Short GRBs, typically lasting less than 2 seconds, have already been associated with binary neutron star (BNS) mergers, which are also sources of gravitational waves (GWs). The ultimate fate of a BNS, after coalescence, is usually expected to be a black hole (BH) with 2-3 solar masses. However, numerical relativity simulations indicate the possible formation of a short-lived hypermassive neutron star (HMNS), lasting for tens to hundreds of milliseconds after the BNS merger and before gravitational collapse forms a BH. The HMNS is expected to emit GWs with kHz frequencies that will be detectable by third generation ground-based GW detectors in the 2030s. I will present results from a recent analysis that revealed evidence for HMNSs by looking for kHz qusiperiodic oscillations in gamma-ray observations obtained in the 1990s with the Compton Gamma Ray Observatory. 

Gravity Seminar
Monday, March 13, 2023
1:30 PM
Physics, Room 313

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