Hypercritical Accretion, Induced Gravitational Collapse, and Binary-Driven Hypernovae

Understand

The induced gravitational collapse (IGC) paradigm has been successfully applied to the explanation of the concomitance of gamma-ray bursts (GRBs) with supernovae (SNe) Ic.

• The progenitor is a tight binary system composed by a carbon-oxygen (CO) core and a neutron star (NS) companion.
• The explosion of the SN leads to hypercritical accretion onto the NS companion which reaches the critical mass, hence inducing its gravitational collapse to a black hole (BH) with consequent emission of the GRB.
• The first estimates of this process were based on a simplified model of the binary parameters and the Bondi-Hoyle-Lyttleton accretion rate.