两种物态方程下铁核塌缩型超新星爆发机制的数值模拟

【目的】物态方程对铁核塌缩型超新星爆发过程中铁核塌缩、激波产生及其传播等都将产生影响。为了探索对超新星爆发机制解释更合理的物态方程,对比分析2种物态方程对铁核塌缩型超新星爆发的影响。【方法】以新前身星模型数据作为输入参量,分别采用Lattimer等(LS物态方程)和王贻仁等(W物态方程)提出的物态方程,对不同初始质量的铁核塌缩型超新星的爆发过程进行数值模拟,并对比分析模拟结果。【结果】在LS物态方程下,铁核塌缩结束时恒星的中心密度最高只达到核密度的1.5倍,且得到的同模区偏小,中微子的能量损失较大,这使激波在向外传播过程中损失了较多能量,不利于解释超新星的成功爆发。【结论】W物态方程更能合理解释超新星的成功爆发。

Numeral Simulation for Iron Core Supernova Explosion with Two Kinds of Equation of State

Objective] The equation of state (EOS) obviously causes influence on the iron-core collapse, the generation and propagation of shock waves in iron core supernova explosion.To seek reasonable EOS for understanding the mechanism about supernova explosion, the effects of two kinds of EOS on iron core supernova explosions are analyzed.Methods] With the input data of progenitor stars, the iron core supernova explosions of different mass are numerical simulated by the EOS from Lattimer and Swesty group (LS EOS) or from Wang Yi-ren group (W EOS).And the results are discussed by comparison.Results] The density of stellar center only reaches to 1.5 times than nuclear density at the end of iron core collapse with the LS EOS.The inner core is smaller and the energy loss of neutrino is larger than that with the W EOS, indicating that there is more energy loss in outward propagation of shock wave with the LS EOS, which is not good for a successful supernova explosion.Conclusion] The W EOS is better to explain a supernova explosion reasonably.