Lyutikov 2010 超新星和伽马暴的爆炸

主要内容:
考虑近似球对称的超新星爆炸和各向异性的伽马暴爆炸。超新星在前，伽马暴的喷流穿过一个很陡的由于超新星爆炸引起的幂律密度分布的包层，这里会不稳定。（我怎么觉得幂律越陡，后面的物质越不起作用，应该越稳定呢？）

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Title:		Double explosions and jet formation in GRB-supernova progenitors
Authors:		Lyutikov, Maxim
Publication:		eprint arXiv:1009.0734
Publication Date:		09/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Bibliographic Code:		2010arXiv1009.0734L

Abstract

Progenitors of long GRBs, and core-collapse supernovae in general, may have two separate mechanisms driving the outflows: quasi-isotropic neutrino-driven supernova explosions followed by a highly collimated relativistic outflow driven by the GRB central engine, a black hole or a magnetar. We consider the dynamics of the second GRB-driven explosion propagating through expanding envelope generated by the passage of the primary supernova shock. Beyond the central core, in the region of steep density gradient created by the SN shock breakout, the accelerating secondary quasi-spherical GRB shock become unstable to corrugation and under certain conditions may form a highly collimated jet, a "chimney", when a flow expands almost exclusively along a nearly cylindrically collimated channel. Thus, weakly non-spherical driving and/or non-spherical initial conditions of the wind cavity may produce highly non-spherical, jetted outflows. For a constant luminosity GRB central engine, this occurs for density gradient in the envelope \rho ~ r^{-\omega} steeper than \omega >4.

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