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arXiv 2102.11283astro-ph.HEhep-exhep-thnucl-exnucl-th
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基于长期轴对称模拟的超新星中微子信号

Supernova neutrino signals based on long-term axisymmetric simulations

Hiroki Nagakura, Adam Burrows, David Vartanyan

摘要:

我们研究了用轴对称CCSN模拟计算的来自核心坍缩超新星(CCSN)的理论中微子信号,该模拟覆盖了直到$\sim 4$ ~s的反弹后阶段。我们提供了中微子信号的基本数量,如事件率,能谱,和累积事件数在一些地面中微子探测器,然后讨论了一些新的功能,在后期出现在我们的模型。与普遍的看法相反,在后期阶段的中微子发射并不总是稳定的,而是有时间波动,其活力取决于CCSN模型和中微子味道。我们发现,这样的时间变化主要不是由原中子星(PNS)对流驱动,但在爆炸模型的回落吸积。我们评估这些时间变化的可检测性,并发现IceCube是最有前途的检测器来解决它们。我们还更新了拟合公式首次提出在我们以前的论文中,总中微子能量(TONE)在CCSN源发射的估计从每个探测器的事件的累积数量。这将是一个强大的技术,用于分析实际观测,特别是低统计数据。

英文摘要:

We study theoretical neutrino signals from core-collapse supernova (CCSN) computed using axisymmetric CCSN simulations that cover the post-bounce phase up to $\sim 4$~s. We provide basic quantities of the neutrino signals such as event rates, energy spectra, and cumulative number of events at some terrestrial neutrino detectors, and then discuss some new features in the late phase that emerge in our models. Contrary to popular belief, neutrino emissions in the late phase are not always steady, but rather have temporal fluctuations, the vigor of which hinges on the CCSN model and neutrino flavor. We find that such temporal variations are not primarily driven by proto-neutron star (PNS) convection, but by fallback accretion in exploding models. We assess the detectability of these temporal variations, and find that IceCube is the most promising detector with which to resolve them. We also update fitting formulae first proposed in our previous paper for which the total neutrino energy (TONE) emitted at the CCSN source is estimated from the cumulative number of events in each detector. This will be a powerful technique with which to analyze real observations, particularly for low-statistics data.

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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