Volume 548, December 2012
|Number of page(s)||4|
|Published online||26 November 2012|
GRB 090618: a candidate for a neutron star gravitational collapse onto a black hole induced by a type Ib/c supernova
Dipartimento di Fisica and ICRASapienza Università di Roma,
P.le Aldo Moro 5, 00185 Rome, Italy ICRANet, P.zza
della Repubblica 10,
e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
Accepted: 16 October 2012
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 ~ 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, MNS, and for the SN core progenitor, Mcore, the following mass ranges: 1.8 ≲ MNS/M⊙ ≲ 2.1 and 3 ≤ Mcore/M⊙ ≤ 8. Finally, we discuss the complementarity of these considerations to alternative processes explaining long and short GRBs.
Key words: accretion, accretion disks / binaries: general / gamma-ray burst: general / stars: neutron / supernovae: general
© ESO, 2012
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