GRB 090618: a candidate for a neutron star gravitational collapse onto a black hole induced by a type Ib/c supernova

作者：Izzo L^*; Rueda J A; Ruffini R

来源：Astronomy & Astrophysics, 2012, 548: L5.

DOI：10.1051/0004-6361/201219813

• accretion, accretion disks
• binaries: general
• gamma-ray burst: general
• stars: neutron
• supernovae: general

A novel concept has recently been proposed for explaining the temporal coincidence of some gamma ray bursts (GRBs) with an associated supernova (SN) in terms of the gravitational collapse of a neutron star (NS) onto a black hole (BH), induced by a type Ib/c SN explosion. We applied these considerations to the exceptional case of GRB 090618, for which there is evidence of an SN similar to 10 days after the GRB occurrence. We calculated the accretion rate and total accreted mass onto an NS from an SN Ib/c that originated from a companion evolved star. These calculations show that the NS reaches the critical mass in a few seconds and undergoes gravitational collapse onto a BH, leading to the emission of a GRB. We find for the mass of the NS companion, M-NS, and for the SN core progenitor, M-core, the following mass ranges: 1.8 less than or similar to M-NS/M-circle dot less than or similar to 2.1 and 3 <= M-core/M-circle dot <= 8. Finally, we discuss the complementarity of these considerations to alternative processes explaining long and short GRBs.

• 出版日期2012-12