2020-12-2

Astrophysics of compact binary mergers

Speaker: Kenta Hotokezaka (Univ. of Tokyo)

Abstract:

Since the discovery of the binary black hole merger in 2015, the LIGO-Virgo observatories have leveraged a new messenger, gravitational waves (GWs), to study the Universe. In 2017, a new era of multi-messenger astronomy has begun with the simultaneous detection of GWs and electromagnetic waves from the binary neutron star (BNS) merger GW170817, which yielded a scientific bonanza in fields as wide-ranging as gravitational physics, nucleosynthesis, dense nuclear matter, relativistic jets, and cosmology. In this talk, I will  talk about astrophysical implications of the most recent GW source catalogue, GWTC-2. Then I will review the multiwavelength studies of the BNS merger GW170817 including kilonova, gamma-ray burst, long-lasting afterglow, and GW cosmology. I will also talk about a progress in kilonova nebula modelings, which will be important to obtain the knowledge of BNS r-process in the JWST era.