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arXiv 2008.08984astro-ph.HE
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中微子驱动的核塌缩超新星模型的磁场依赖性的二维数值研究

Two-dimensional numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models

Jin Matsumoto, Tomoya Takiwaki, Kei Kotake, Yuta Asahina, Hiroyuki R. Takahashi

摘要:

我们研究了磁场对非旋转恒星内核动力学的影响,通过执行二维(2D),磁流体动力学(MHD)模拟。为此,我们已经更新了我们的中微子辐射流体动力学超新星代码,包括MHD采用的发散清洗方法与有限体积和面积重建的仔细治疗。通过改变初始磁场强度,研究了$15.0$、$18.4$和$27.0$ $M_\odot$前超新星前身星的演化.在我们的研究中,一个有趣的发现是中微子驱动的爆炸发生与初始磁场的强度无关。对于本文提出的二维模型,中微子加热是爆炸的主要驱动力,而磁场则是爆炸前动力学的次要因素。结果表明,强磁场相对于弱磁场,在小尺度上减弱了中微子驱动湍流的增长。这导致激波后区域的湍流动能增加较慢,从而导致初始磁场较强的模型的激波复苏的开始略有延迟。

英文摘要:

We study the effects of the magnetic field on the dynamics of non-rotating stellar cores by performing two-dimensional (2D), magnetohydrodynamics (MHD) simulations. To this end, we have updated our neutrino-radiation-hydrodynamics supernova code to include MHD employing a divergence cleaning method with both careful treatments of finite volume and area reconstructions. By changing the initial strength of the magnetic field, the evolution of $15.0$, $18.4$ and $27.0$ $M_\odot$ presupernova progenitors is investigated. An intriguing finding in our study is that the neutrino-driven explosion occurs regardless of the strength of the initial magnetic field. For the 2D models presented in this work, the neutrino heating is the main driver for the explosion, whereas the magnetic field secondary contributes to the pre-explosion dynamics. Our results show that the strong magnetic field weakens the growth of the neutrino-driven turbulence in the small scale compared to the weak magnetic field. This results in the slower increase of the turbulent kinetic energy in the postshock region, leading to the slightly delayed onset of the shock revival for models with the stronger initial magnetic field.

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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