1206.2887 (L. Izzo et al.)

GRB 090618: The First Example of a Neutron Star Gravitational Collapse to a Black Hole Induced by a Type Ib/c Supernova    [PDF]

L. Izzo, Jorge A. Rueda, R. Ruffini

We use the explicit expression for the accretion rate and the total accreted mass onto a neutron star from a Supernova Ib/c originated from a companion evolved star. We apply these considerations to the exceptional case of GRB 090618, for which there is evidence of a supernova $\sim 10$ days after the GRB occurrence. It is shown that the neutron star reaches in a few seconds the critical mass and undergoes gravitational collapse leading to the emission of a GRB. This approach gives a natural explanation of the temporal coincidence of a type Ib/c Supernova and a GRB. We find for the mass of the neutron star companion, $M_{\rm NS}$, and for the supernova progenitor, $M_{\rm SN-prog}$, the following mass ranges: $1.94\lesssim M_{\rm NS}/M_\odot \lesssim 2.16$ and $3\leq M_{\rm SN-prog}/M_\odot \leq 6$.

View original: http://arxiv.org/abs/1206.2887