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arXiv 1401.3032astro-ph.HE
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核心坍缩超新星的后退机制

The Fallback Mechanisms in Core-Collapse Supernovae

Tsing-Wai Wong, Christopher L. Fryer, Carola I. Ellinger, Gabriel Rockefeller, Vassiliki Kalogera

摘要:

虽然核心坍缩超新星机制的细节尚未完全了解,但人们普遍认为坍缩释放的能量会产生冲击波,破坏恒星并产生爆炸。一些恒星物质没有获得足够的能量来逃离新形成的中子星的势阱,它又落回了核心。这种回落在设置紧凑的残余质量中起着重要的作用,并被用来解释一些观察到的现象:晚时间中微子发射,r-过程元素的生产,奇特的超新星,和长时间的伽马射线暴。为了研究回退和这些观察到的现象之间的联系,我们必须了解回退的本质,目前,已经提出了多种机制,导致回退的不同特征。在本文中,我们模拟了一系列的三维爆炸后回落两个不同的大规模的祖先,研究的回落的性质和不对称爆炸的作用,这个回落。后退背后最常被引用的机制之一认为,它是由向外移动的超新星激波在恒星包层相对平坦的密度分布中减速时产生的反向激波引起的。我们表明,这种机制起着次要的,如果有的话,在驱动回落和大多数超新星回落产生的提示机制的作用。

英文摘要:

Although the details of the core-collapse supernova mechanism are not fully understood, it is generally accepted that the energy released in the collapse produces a shock that disrupts the star and produces the explosion. Some of the stellar material does not receive enough energy to escape the potential well of the newly formed neutron star and it falls back on to the core. This fallback plays an important role in setting compact remnant masses and has been invoked to explain a number of observed phenomena: late-time neutrino emission, r-process element production, peculiar supernovae, and long-duration gamma-ray bursts. To examine the link between fallback and these observed phenomena, we must understand the nature of fallback and currently, multiple mechanisms have been proposed that lead to different characteristics of the fallback. In this paper, we model a series of three-dimensional explosions by following the fallback for two different massive progenitors to study both the nature of the fallback and the role of asymmetric explosions on this fallback. One of the most-cited mechanisms behind fallback argues that it is caused by the reverse shock produced when the outward moving supernova shock decelerates in the relatively flat density profile of the stellar envelope. We show that this mechanism plays a minor, if any, role in driving fallback and most supernova fallback is produced by prompt mechanisms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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