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arXiv 0810.0963astro-phnucl-th
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核塌缩超新星状态方程统计处理的比较

Comparison of statistical treatments for the equation of state for core-collapse supernovae

S. R. Souza, A. W. Steiner, W. G. Lynch, R. Donangelo, M. A. Famiano

摘要:

在坍缩、反弹和随后的爆炸过程中释放出的中微子提供了有关超新星动力学的信息。中微子的光谱是由它与恒星内部区域的原子核和核子之间的弱相互作用决定的,因此中微子的光谱是由物质的组成决定的。恒星物质的组成,温度范围从$T=1-3$兆电子伏和密度范围从$10^{-5}$到0.1倍的饱和密度进行了探讨。我们研究了通常用于描述超新星模拟中的致密物质的单核近似,并表明,虽然近似在大多数密度下预测能量和压力是准确的,但它不能准确地预测组成。我们发现,随着温度和密度的增加,单核近似系统地高估了实际存在的原子核的质量数,并低估了较轻的原子核的贡献。

英文摘要:

Neutrinos emitted during the collapse, bounce and subsequent explosion provide information about supernova dynamics. The neutrino spectra are determined by weak interactions with nuclei and nucleons in the inner regions of the star, and thus the neutrino spectra are determined by the composition of matter. The composition of stellar matter at temperature ranging from $T=1-3$ MeV and densities ranging from $10^{-5}$ to 0.1 times the saturation density is explored. We examine the single-nucleus approximation commonly used in describing dense matter in supernova simulations and show that, while the approximation is accurate for predicting the energy and pressure at most densities, it fails to predict the composition accurately. We find that as the temperature and density increase, the single nucleus approximation systematically overpredicts the mass number of nuclei that are actually present and underestimates the contribution from lighter nuclei which are present in significant amounts.

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