Properties of long gamma-ray bursts from massive compact binaries.

TitleProperties of long gamma-ray bursts from massive compact binaries.
Publication TypeJournal Article
Year of Publication2013
AuthorsChurch RP, Levan AJ, Davies MB, Kim C
JournalPhilosophical transactions. Series A, Mathematical, physical, and engineering sciences
Date Published2013 Jun 13

We consider the implications of a model for long-duration gamma-ray bursts in which the progenitor is spun up in a close binary by tidal interactions with a massive black-hole companion. We investigate a sample of such binaries produced by a binary population synthesis, and show that the model predicts several common features in the accretion on to the newly formed black hole. In all cases, the accretion rate declines as approximately t(-5/3) until a break at a time of order 10(4) s. The accretion rate declines steeply thereafter. Subsequently, there is flaring activity, with the flare peaking between 10(4) and 10(5) s, the peak time being correlated with the flare energy. We show that these times are set by the semi-major axis of the binary, and hence the process of tidal spin-up; furthermore, they are consistent with flares seen in the X-ray light curves of some long gamma-ray bursts.

Alternate JournalPhilos Trans A Math Phys Eng Sci