Lazzati, Davide 2011 用中心引擎的持续时间来分类伽马暴Ibc型超新星等

主要内容:
假设中心引擎的持续时间就是能产生喷流的时间，考虑到喷流还要穿过恒星包层，那么喷流时间最长的能产生正常的长伽马暴；中等长度的只能产生如GRB 980425样的弱伽马暴；短的只产生超新星，不过这种超新星的速度蛮快的；最短的，就只有一个一般的超新星，而没有任何伽马暴的特征了。

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Title:		Unifying the Zoo of Jet-Driven Stellar Explosions
Authors:		Lazzati, Davide; Morsony, Brian J.; Blackwell, Christopher H.; Begelman, Micthell C.
Publication:		eprint arXiv:1111.0970
Publication Date:		11/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Comment:		8 pages, 5 figures, submitted to ApJL. Full resolution version of Fig. 1 available at http://grb.physics.ncsu.edu/ms_hr.pdf
Bibliographic Code:		2011arXiv1111.0970L

Abstract

We present a set of numerical simulations of stellar explosions induced by relativistic jets emanating from a central engine sitting at the center of compact, dying stars. We explore a wide range of durations of the central engine activity, two candidate stellar progenitors, and two possible values of the total energy release. We find that even if the jets are narrowly collimated, their interaction with the star unbinds the stellar material, producing a stellar explosion. We also find that the outcome of the explosion can be very different depending on the duration of the engine activity. Only the longest-lasting engines result in successful gamma-ray bursts. Engines that power jets only for a short time result in relativistic supernova explosions, akin to observed engine-driven SNe such as SN2009bb. Engines with intermediate durations produce weak gamma-ray bursts, with properties similar to nearby bursts such as GRB 980425. Finally, we find that the engines with the shortest durations, if they exist in nature, produce stellar explosions that lack sizable amounts of relativistic ejecta and are therefore dynamically indistinguishable from ordinary core-collapse supernovae.

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