On the pair-instability supernovae and gamma-ray burst phenomenon |
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| Authors: | Pascal Chardonnet,Valery Chechetkin,Lev Titarchuk |
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| Affiliation: | 1.LAPTH,Université de Savoie, CNRS,Annecy-le-Vieux Cedex,France;2.Keldysh Institute of Applied Mathematics (IPM),Russian Academy of Science,Moscow,Russia;3.George Mason,Fairfax,USA;4.US Naval Research Laboratory,Washington,USA;5.Dipartimento di Fisica,Universitá di Ferrara,Ferrara,Italy;6.Goddard Space Flight Center,NASA,Greenbelt,USA |
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| Abstract: | We present a model of a gamma-ray burst (GRB) related to “very massive” stars. In the framework of our model, the GRB phenomenon is a result of helium burning in degenerate conditions in a massive star (≳130 M ⊙), in which the thermal nuclear burning occurs in the deflagration regime and has a pulsating temporal pattern. The shock runs away from the burning (reaction) zone, which leads to the development of a coronal outflow (jet-like) structure. In our scenario the GRB observable prompt fast rise and decay part can be a result of photon propagation through the hot corona (Comptonization photosphere) of the star. On the other hand, the GRB afterglow is a cooling phase of the expanding and outflowing envelope. Presumably, the X-ray part of the GRB emergent spectrum is formed due to upscattering of soft photons of outer layers of the star off hot coronal electrons, and thus it should have a specific shape of the Comptonization spectrum. |
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