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arXiv 0811.0456astro-ph
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核塌缩超新星中子化的系统热还原

Systematic thermal reduction of neutronization in core-collapse supernovae

A. F. Fantina, P. Donati, P. M. Pizzochero

摘要:

我们研究了在引力坍缩过程中,核对称能的温度依赖性在多大程度上影响了中微子捕获之前的恒星核的中子化。为此,我们实施了一个单区模拟,以遵循崩溃,直到达到β平衡,轻子分数保持不变。由于与超新星场景相关的富中子核上的电子捕获强度仍然是一个悬而未决的问题,我们将其作为一个自由参数。我们发现,对称能的温度依赖性始终导致去质子化的小幅降低,这对应于冲击波能量学上的系统效应:冲击波离解能的增益很小,但不可忽略,约为0.4 foe(1 foe = 10^51 erg),这一结果几乎与核电子俘获的强度无关。这种系统效应的存在及其在单区模型参数变化下的鲁棒性足以证明进一步研究超新星爆炸的详细数值模拟是有意义的。

英文摘要:

We investigate to what extent the temperature dependence of the nuclear symmetry energy can affect the neutronization of the stellar core prior to neutrino trapping during gravitational collapse. To this end, we implement a one-zone simulation to follow the collapse until beta equilibrium is reached and the lepton fraction remains constant. Since the strength of electron capture on the neutron-rich nuclei associated to the supernova scenario is still an open issue, we keep it as a free parameter. We find that the temperature dependence of the symmetry energy consistently yields a small reduction of deleptonization, which corresponds to a systematic effect on the shock wave energetics: the gain in dissociation energy of the shock has a small yet non-negligible value of about 0.4 foe (1 foe = 10^51 erg) and this result is almost independent from the strength of nuclear electron capture. The presence of such a systematic effect and its robustness under changes of the parameters of the one-zone model are significative enough to justify further investigations with detailed numerical simulations of supernova explosions.

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