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首页> 外文期刊>The Astrophysical journal >THE ROLE OF DOUBLY DIFFUSIVE INSTABILITIES IN THE CORE-COLLAPSE SUPERNOVA MECHANISM
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THE ROLE OF DOUBLY DIFFUSIVE INSTABILITIES IN THE CORE-COLLAPSE SUPERNOVA MECHANISM

机译：双扩散不稳定在核心崩溃超新星机制中的作用

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摘要

We investigate doubly diffusive instabilities in hot, dense stellar material by examining its behavior in response to small perturbations. These instabilities, particularly "neutron fingers," have been suggested to arise in the postcollapse cores of massive stars, where entropy and lepton gradients are stabilizing and destabilizing, respectively, and to be important for the supernova explosion mechanism. We model neutrino-mediated equilibration of energy and leptons as a linear system characterized by four response functions. These latter are evaluated for a given thermodynamic state by detailed neutrino-transport experiments. Our results indicate that regions in a postcollapse stellar core may be semiconvectively rather than neutron-finger unstable but that these regions shrink with time as more and more of the lepton profile of the core falls below the critical lepton number for which a negative lepton gradient becomes stabilizing. Because these results differ from what has been assumed before, the role of doubly diffusive instabilities in the supernova explosion mechanism will have to be reexamined.
机译：我们通过检查其对微小扰动的行为来研究热的致密恒星材料中的双扩散不稳定性。这些不稳定性，特别是“中子指”，被认为是在大质量恒星的坍塌后核中产生的，熵和轻子梯度分别在其中稳定和不稳定，这对于超新星爆炸机制很重要。我们将中微子介导的能量和轻子平衡模型化为一个具有四个响应函数的线性系统。通过详细的中微子传输实验，针对给定的热力学状态评估了后者。我们的结果表明，塌陷后的恒星核中的区域可能是半对流的，而不是中子-手指不稳定的，但是随着越来越多的核的轻子轮廓降到临界轻子数以下（负轻子梯度变为），这些区域会随着时间而收缩稳定。由于这些结果与以前的假设不同，因此必须重新检查双扩散不稳定性在超新星爆炸机制中的作用。

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