A Model of ``Short'' Gamma-Ray Bursts: Heated Neutron Stars in Close Binary Systems

Astronomy and Astrophysics – Astronomy

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Scientific paper

In this paper we present a model for the ``short'' (< 1 second) population of gamma-ray bursts. In this model heated neutron stars in a close binary system near their last stable orbit emit neutrinos at large luminosities (Lmax ~ 1053 ergs/sec). A fraction of these neutrinos will annihilate to form an e+e^- pair plasma wind which will, in turn, expand and recombine to photons which make the gamma-ray burst. We study neutrino pair annihilation into e+e^- pairs and show that a substantial fraction ( ~ 50%) of energy deposited comes from inter-star neutrinos, where each member of the neutrino pair originates from each neutron star. Thus, in addition to the annihilation of neutrinos blowing off of a single star, we have a new source of baryon free energy that is deposited between the stars. To model the e+e^- pair plasma wind between stars, we do three-dimensional relativistic numerical hydrodynamic calculations.

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