Nagakura 2011 数值模拟大质量恒星产生伽马暴

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二维，既有盘，也有包层，在一定条件下喷流可以冲出包层。

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Title:		Population III Gamma-Ray Bursts and Breakout Criteria for Accretion-Powered Jets
Authors:		Nagakura, Hiroki; Suwa, Yudai; Ioka, Kunihito
Publication:		eprint arXiv:1104.5691
Publication Date:		04/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		37 pages, 16 figures, Submitted to ApJ
Bibliographic Code:		2011arXiv1104.5691N

Abstract

We investigate the propagations of accretion-powered jets in various types of massive stars such as Wolf-Rayet stars, light Population III (Pop III) stars, and massive Pop III stars, all of which are the progenitor candidates of Gamma-Ray Bursts (GRBs). We perform two dimensional axisymmetric simulations of relativistic hydrodynamics taking into account both the envelope collapse and the jet propagation (i.e., the negative feedback of the jet on the accretion). We calculate the accretion rate from the mass flux going through the inner boundary, and inject the jet with a constant accretion-to-jet conversion efficiency $\eta$. By varying the efficiency $\eta$ and opening angle $\theta_{op}$ for more than 30 models, we find that the forward shock wave succeeds to break out of the stellar surface and potentially create GRBs in all types of progenitors if a simple condition $\eta \gtrsim 10^{-3} (\theta_{op}/20^{\circ})^2$ is satisfied, that is consistent with analytical estimates, otherwise no explosion or some failed spherical explosions occur. We also suggest that a (slightly) delayed jet injection is preferred for GRBs.

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