arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1010.5550astro-ph.HEastro-ph.SRgr-qc
收藏

核坍缩超新星中黑洞的形成

Black Hole Formation in Failing Core-Collapse Supernovae

Evan O'Connor, Christian D. Ott

摘要:

我们提出了一个失败的核心坍缩超新星和恒星质量的黑洞(BH)的形成系统的研究结果。使用我们的开源广义相对论1.5D程序GR 1D,配备了三种中微子泄漏/加热方案和100多个前超新星模型,我们研究了核物质状态方程(EOS),零年龄主序列(ZAMS)质量和金属丰度,旋转和质量损失处方的选择对BH形成的影响。我们发现,结果,对于一个给定的状态方程,可以估计,一阶,由一个单一的参数,在反弹的恒星核心的紧凑性。通过比较质子中子星(PNS)的结构在重力不稳定性的开始与托尔曼-奥本海默方程的解决方案,我们发现,在外部PNS核心的热压力支持是负责提高最大PNS质量高达25%以上的冷NS值。通过人为增加中微子加热,我们发现了爆炸给定的祖结构所需的临界中微子加热效率,并将这些发现与ZAMS条件联系起来,建立,尽管是近似的,第一次基于实际的坍缩模拟,ZAMS参数和核心坍缩结果之间的映射。我们还研究了先驱体转动的影响,发现由于非轴对称转动不稳定性的出现,新生黑洞的无量纲自旋可能被鲁棒地限制在a^* = Jc/GM ^2 = 1以下。

英文摘要:

We present results of a systematic study of failing core-collapse supernovae and the formation of stellar-mass black holes (BHs). Using our open-source general-relativistic 1.5D code GR1D equipped with a three-species neutrino leakage/heating scheme and over 100 presupernova models, we study the effects of the choice of nuclear equation of state (EOS), zero-age main sequence (ZAMS) mass and metallicity, rotation, and mass-loss prescription on BH formation. We find that the outcome, for a given EOS, can be estimated, to first order, by a single parameter, the compactness of the stellar core at bounce. By comparing protoneutron star (PNS) structure at the onset of gravitational instability with solutions of the Tolman-Oppenheimer-Volkof equations, we find that thermal pressure support in the outer PNS core is responsible for raising the maximum PNS mass by up to 25% above the cold NS value. By artificially increasing neutrino heating, we find the critical neutrino heating efficiency required for exploding a given progenitor structure and connect these findings with ZAMS conditions, establishing, albeit approximately, for the first time based on actual collapse simulations, the mapping between ZAMS parameters and the outcome of core collapse. We also study the effect of progenitor rotation and find that the dimensionless spin of nascent BHs may be robustly limited below a^* = Jc/GM^2 = 1 by the appearance of nonaxisymmetric rotational instabilities.

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。

↑