Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-06
Astrophys.J.611:L81-L84,2004
Astronomy and Astrophysics
Astrophysics
to appear in ApJ Lett
Scientific paper
10.1086/423934
We study centered and decentered nucleation of black holes in core-collapse of massive stars in binaries. By Bekenstein's gravitational-radiation recoil mechanism, a newly nucleated black hole typically leaves the central core prematurely. With low probability, the black hole remains centered and matures to a high-mass black hole which spins rapidly if the binary is compact. GRB030329/SN2003dh demonstrates that Type Ib/c supernovae are the parent population of long GRBs, whose branching ratio is ${\cal R}=(2-4)\times 10^{-3}$. We identify ${\cal R}$ with the low probability of centered nucleation in compact binaries. Decentered events are predicted to produce a single short burst in gravitational radiation. Centered events are predicted to produce a second, long-burst in gravitational radiation powered by a luminous black hole. These signatures are of interest to LIGO, VIRGO and TAMA.
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