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arXiv 1912.03378astro-ph.HEgr-qc
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坍缩星核合成的全输运广义相对论辐射磁流体力学

Full Transport General Relativistic Radiation Magnetohydrodynamics for Nucleosynthesis in Collapsars

Jonah M. Miller, Trevor M. Sprouse, Christopher L. Fryer, Benjamin R. Ryan, Joshua C. Dolence, Matthew R. Mumpower, Rebecca Surman

摘要:

我们用全输运、频率依赖、广义相对论辐射磁流体力学模型模拟了一个致密黑洞-吸积盘系统。我们研究是否风从一个星盘可以进行快速中子捕获(r-过程)核合成,并显着贡献太阳r-过程丰度。我们发现,准确的运输列入外流有显着的影响,提高电子分数以上$Y_{\rm e} \sim 0.3$,并防止第三峰r-过程材料被合成。我们分析了时间演化的中微子过程和电子分数的磁盘,并提出了一个简单的一维模型出现的垂直结构。我们比较我们的模拟半分析的期望,并认为,准确的中微子运输和现实的初始和边界条件,需要捕捉的动力学和核合成的结果的一个星。

英文摘要:

We model a compact black hole-accretion disk system in the collapsar scenario with full transport, frequency dependent, general relativistic radiation magnetohydrodynamics. We examine whether or not winds from a collapsar disk can undergo rapid neutron capture (r-process) nucleosynthesis and significantly contribute to solar r-process abundances. We find the inclusion of accurate transport has significant effects on outflows, raising the electron fraction above $Y_{\rm e} \sim 0.3$ and preventing third peak r-process material from being synthesized. We analyze the time-evolution of neutrino processes and electron fraction in the disk and present a simple one-dimensional model for the vertical structure that emerges. We compare our simulation to semi-analytic expectations and argue that accurate neutrino transport and realistic initial and boundary conditions are required to capture the dynamics and nucleosynthetic outcome of a collapsar.

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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