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arXiv 1608.05320astro-ph.HE
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快速旋转大质量恒星的不对称核心坍缩

Asymmetric core collapse of rapidly rotating massive star

Avishai Gilkis

摘要:

非轴对称特征被发现在一个快速旋转的大质量恒星的核心崩溃,这可能有重要的影响,磁场放大和生产的双极外流,可以爆炸的恒星,以及r-过程核合成和natal踢。一个进化的快速旋转的大质量恒星的崩溃,其次是在三维流体动力学模拟使用的FLASH代码与中微子泄漏。一个旋转的原中子星(PNS)以非零的线速度形成。这可能有助于致密残留物的出生踢。PNS被湍流介质包围,其中高剪切可能放大磁场,这反过来又可以驱动双极流出。PNS附近的富中子物质可能会引起强烈的r过程核合成。快速旋转的PNS具有E> 10 foe的转动能。以类似方式进行的磁星形成将能够通过自旋下降机制在超新星喷出物中沉积一部分能量。这些过程对于由快速旋转的祖星产生的罕见超新星可能很重要,即使在本研究中没有模拟完整的爆炸。

英文摘要:

Non-axisymmetric features are found in the core collapse of a rapidly rotating massive star, which might have important implications for magnetic field amplification and production of a bipolar outflow that can explode the star, as well as for r-process nucleosynthesis and natal kicks. The collapse of an evolved rapidly rotating massive star is followed in three-dimensional hydrodynamic simulations using the FLASH code with neutrino leakage. A rotating proto-neutron star (PNS) forms with a non-zero linear velocity. This can contribute to the natal kick of the remnant compact object. The PNS is surrounded by a turbulent medium, where high shearing is likely to amplify magnetic fields, which in turn can drive a bipolar outflow. Neutron-rich material in the PNS vicinity might induce strong r-process nucleosynthesis. The rapidly rotating PNS possesses a rotational energy of E>10foe. Magnetar formation proceeding in a similar fashion will be able to deposit a portion of this energy later on in the supernova ejecta through a spin down mechanism. These processes can be important for rare supernovae generated by rapidly rotating progenitors, even though a complete explosion is not simulated in the present study.

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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