GRB 190829A -- A Showcase of Binary Late Evolution

Yu Wang, J. A. Rueda, R. Ruffini, R. Moradi, Liang Li, Y. Aimuratov, F. Rastegarnia, S. Eslamzadeh, N. Sahakyan, Yunlong Zheng

Submitted on 12 July 2022


GRB 190829A is the fourth closest gamma-ray burst (GRB) to date (z=0.0785). Owing to its wide range of radio, optical, X-ray, and the very-high-energy (VHE) observations by H.E.S.S., it has become an essential new source examined by various models with complementary approaches. We here show in GRB 190829A the double-prompt pulses and the three-multiwavelength afterglows are consistent with the type II binary-driven hypernova (BdHN II) model. The progenitor is a binary composed of a carbon-oxygen (CO) star and a neutron star (NS) companion. The gravitational collapse of the iron core of the CO star produces a supernova (SN) explosion and leaves behind a new neutron star (νNS) at its center. The accretion of the SN ejecta onto the NS companion and onto the νNS via matter fallback spins up the NSs and produces the double-peak prompt emission. The synchrotron emission from the expanding SN ejecta with the energy injection from the rapidly spinning νNS and its subsequently spin-down leads to the afterglow in the radio, optical, and X-ray. We model the sequence of physical and related radiation processes in BdHNe and focus on individuating the binary properties that play the relevant roles.


Comment: 14 pages, 6 figures. Accepted for publication in ApJ

Subject: Astrophysics - High Energy Astrophysical Phenomena