为爆炸做准备：前超新星中的流体动力学不稳定性和Turbulence
Preparing for an Explosion: Hydrodynamic Instabilities and Turbulence in Presupernovae
摘要：
观测和直接的数值模拟都与传统的恒星演化代码对大质量恒星在核心坍缩之前的最后阶段的预测不一致。我们认为，问题在于在这些代码中的湍流对流的治疗，忽略了有限振幅波动的速度和温度，以及它们的非线性相互作用与核燃烧。可能出现的流体动力学不稳定性促使我们讨论一些对大质量恒星命运的深远影响。特别是，我们探索连接到增强的前超新星质量损失，不稳定的核燃烧和随之而来的爆发，膨胀的恒星半径，可能会引发激烈的相互作用与伴星，和潜在的修改核心结构，可能会显着影响计算的核心崩溃机制本身。这些修改可能是至关重要的陨石中测量的同位素异常的解释，改变混合和详细的核合成的预测，年轻的核心坍塌超新星遗迹。它们还可能使开发一种早期预警系统成为可能，以探测即将发生的堆芯坍塌。
英文摘要：
Both observations and direct numerical simulations are discordant with predictions of conventional stellar evolution codes for the latest stages of a massive star's life prior to core collapse. We suggest that the problem lies in the treatment of turbulent convection in these codes, which ignores finite amplitude fluctuations in velocity and temperature, and their nonlinear interaction with nuclear burning. The hydrodynamic instabilities that may arise prompt us to discuss a number of far-reaching implications for the fates of massive stars. In particular, we explore connections to enhanced presupernova mass loss, unsteady nuclear burning and consequent eruptions, swelling of the stellar radius that may trigger violent interactions with a companion star, and potential modifications to the core structure that could dramatically impact calculations of the core-collapse mechanism itself. These modifications may be of fundamental importance to the interpretation of measured isotopic anomalies in meteorites, changing the predictions of both mixing and detailed nucleosynthesis, and of young core-collapse supernova remnants. They may also make possible the development of an early warning system for the detection of impending core collapse.
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