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arXiv 1509.02494astro-ph.HEastro-ph.SR
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简化的核心坍缩超新星爆炸的随机性和效率

Stochasticity and efficiency of simplified core-collapse supernova explosions

Christian Y. Cardall, Reuben D. Budiardja

摘要:

我们提出了一个初步的报告160个高度简化的模型的反弹后核心坍缩超新星环境在三维空间(3D)的模拟。我们设置不同的值的一个参数表征的影响,在失速冲击,以调节后冲击流体的速度,从而确定对流和静止吸积激波不稳定性(SASI)的相对重要性。虽然我们的对流主导运行符合在给定的质量吸积率下爆炸的“临界中微子光度”的范式概念(尽管爆炸时间在阈值以上有一个非平凡的传播),但我们的SASI主导运行的结果要随机得多:在$\sim 20\%$的光度范围内,一个尖锐的阈值临界光度被“涂抹”成一个不断上升的爆炸概率。我们还发现,SASI占主导地位的模型能够爆炸的效率低3至4倍的中微子加热,这表明祖属性,流体和中微子微观物理,有利于SASI将使中微子驱动的爆炸机制更加强大。

英文摘要:

We present an initial report on 160 simulations of a highly simplified model of the post-bounce core-collapse supernova environment in three spatial dimensions (3D). We set different values of a parameter characterizing the impact of nuclear dissociation at the stalled shock in order to regulate the post-shock fluid velocity, thereby determining the relative importance of convection and the stationary accretion shock instability (SASI). While our convection-dominated runs comport with the paradigmatic notion of a `critical neutrino luminosity' for explosion at a given mass accretion rate (albeit with a nontrivial spread in explosion times just above threshold), the outcomes of our SASI-dominated runs are much more stochastic: a sharp threshold critical luminosity is `smeared out' into a rising probability of explosion over a $\sim 20\%$ range of luminosity. We also find that the SASI-dominated models are able to explode with 3 to 4 times less efficient neutrino heating, indicating that progenitor properties, and fluid and neutrino microphysics, conducive to the SASI would make the neutrino-driven explosion mechanism more robust.

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