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arXiv 1809.07967astro-ph.HE
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黑洞吸积作为核塌缩超新星爆炸能量源的力学反馈

Mechanical feedback from black hole accretion as an energy source of core-collapse supernova explosions

En-Hao Feng, Rong-Feng Shen, Wei-Peng Lin

摘要:

根据核心坍缩超新星的传统设想,坍缩恒星的核心形成了一颗中子星,其引力能量释放向恒星外壳发出冲击波。然而,在大量的数值模拟中,激波失速和恒星不能成功爆炸,特别是对于大质量的紧凑恒星。我们考虑另一种情况,即随着质量的回落,坍缩的恒星在中心形成一个黑洞,周围是一个密集的,热的吸积盘,吹出强烈的外流(风)。风的动能可能导致恒星爆炸成功。本文对Kohri等人(2005)研究小回落中子星吸积的公式进行了改进,通过计算一组具有不同初始表面旋转速度、质量和金属丰度的前SN恒星模型的吸积历史,并通过比较盘风能和下落恒星包层的结合能,研究了这种盘风驱动的爆炸。我们表明,最有希望的模型,成功地通过这个新的通道是那些相对紧凑的前SN星相对较低的金属丰度和不太低的特定角动量。爆炸的总能量是$\sim 10^{51-52}$尔格,质量更大的前身可能产生更高能的爆炸。

英文摘要:

According to the traditional scenario for core-collapse supernovae, the core of the collapsing star forms a neutron star and its gravitational energy release sends out a shockwave into the stellar envelope. However, in a significant number of numerical simulations, the shock stalls and the star cannot be exploded successfully, especially for a massive, compact star. We consider an alternative scenario that with mass fallback, the collapsing star forms a black hole in the center, surrounded by a dense, hot accretion disk, which blows out an intense outflow (wind). The kinetic energy of the wind may result in a successful stellar explosion. With an improved version of the formulism in Kohri et al. (2005) who studied neutron star accretion of minor fallback, we study this disk wind-driven explosion by calculating the accretion history for a suite of pre-SN stellar models with different initial surface rotational velocities, masses and metallicities, and by comparing the disk wind energy with the binding energy of the infalling stellar envelope. We show that the most promising models to be exploded successfully by this new channel are those relatively compact pre-SN stars with relatively low metallicities and not too low specific angular momenta. The total energies of the explosions are $\sim 10^{51-52}$ergs, and a more massive progenitor may produce a more energetic explosion.

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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