Electron fraction constraints based on Nuclear Statistical Equilibrium with beta equilibrium
Electron fraction constraints based on Nuclear Statistical Equilibrium with beta equilibrium
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基于具有β平衡的核统计平衡的电子分数约束
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
S. Woosley
中科院分区：
文献类型：
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作者：
A. Arcones;G. Martínez;Luke F. Roberts;S. Woosley
电子核子比或电子分数是许多天体物理研究中的关键参数。它的值由弱相互作用速率决定，弱相互作用速率是基于受几个核物理不确定性影响的理论计算。因此，重要的是有一个模型独立的方式来约束电子分数值在不同的天体物理环境。在这里，我们表明核统计平衡与β平衡相结合可以提供这样的约束。我们测试这种近似在presupernova模型的有效性，并给出了较低的限制，在Ia型超新星和吸积引起的崩溃的电子分数。
The electron-to-nucleon ratio or electron fraction is a key parameter in many astrophysical studies. Its value is determined by weakinteraction rates that are based on theoretical calculations subject to several nuclear physics uncertainties. Consequently, it is important to have a model independent way of constraining the electron fraction value in different astrophysical environments. Here we show that nuclear statistical equilibrium combined with beta equilibrium can provide such a constraint. We test the validity of this approximation in presupernova models and give lower limits for the electron fraction in type Ia supernova and accretion-induced collapse.