超核密度压缩参数对Ⅱ型超新星爆发的影响
发布时间：2019-01-08 18:01
【摘要】：本文通过使用2002年Woosley提供的前身星模型数据,用"SHII-WLYW89"程序,计算前身星为11M⊙、13M⊙、15M⊙、20M⊙、25M⊙、30M⊙、35M⊙、40M⊙的超新星,调节物态方程中参数v,探讨物态方程中v对超新星星核坍缩、激波传播及爆发能量的影响,这将为物态方程的改进提供依据。 研究结果表明：1.在星核坍缩阶段,v越大,YLc、Yec、Yvc的值保持不变,但中心的熵却减小,pmaxc值也越小,即物态方程越软；2.在反弹过程中,v值越大,EvH也逐渐增大,即中微子携带走的能量也越大。但是同模区内的物质动能、内能、引力势能的总结合能(从t4到t11期间内核转移到外核的能量),随着v增大而先增大后减小。比较而言,对于不同质量的前身星,内星核转移到外星核的能量最大值时的v值不相同。3.在四粒子模型下考察v的变化对不同太阳质量模型的爆发能量影响时,我们发现对于太阳质量模型不同时,最佳的超核密度压缩参数的取值不一样,通过对8个模型的对比,发现：v=2较为合适；这些结论说明v对超新星铁核坍缩、激波传播时刻能量转移、爆发能量等有重要的影响。这对于超新星爆发的研究有着重要的意义。
[Abstract]:In this paper, by using the data of the predecessor star model provided by Woosley in 2002 and the program "SHII-WLYW89", we calculate the supernovae whose predecessor stars are 11m _ (?), () ~ (13) M _ (?), (15M), 20m _ (?), 25M _ (?), 30M _ (?), 35M _ (?), 40m _, and adjust the parameters v in the equation of state. The effects of v on the collapse of supernova star nucleus, the propagation of shock wave and the burst energy in the equation of state are discussed, which will provide the basis for the improvement of the equation of state. The results show that: 1. At the stage of star collapse, the value of YLc,Yec,Yvc remains unchanged with the increase of v, but the entropy of the center decreases and the value of pmaxc is smaller, that is, the equation of state is softer; 2. In the process of rebound, the higher v value, the larger the EvH, that is, the greater the energy of neutrino walking. However, the total binding energy of mass kinetic energy, internal energy and gravitational potential energy in the same mode region (the energy transferred from the core to the outer nucleus between t 4 and t 11) increases first and then decreases with the increase of v. In comparison, for different masses of precursors, the v value of the inner star's nucleus transferring to the maximum of the energy of the alien nucleus is not the same as that of the former star's. 3. 3. Under the four-particle model, when we investigate the effect of v variation on the burst energy of different solar mass models, we find that the best compression parameters of supernuclei density are different for different solar mass models. The results showed that vx2 was more suitable; These results indicate that v has an important effect on the collapse of supernova iron nuclei, energy transfer at shock wave propagation time and burst energy. This is of great significance for the study of supernova eruptions.
【学位授予单位】：广西师范大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：P145.3
本文编号：2404941
[Abstract]:In this paper, by using the data of the predecessor star model provided by Woosley in 2002 and the program "SHII-WLYW89", we calculate the supernovae whose predecessor stars are 11m _ (?), () ~ (13) M _ (?), (15M), 20m _ (?), 25M _ (?), 30M _ (?), 35M _ (?), 40m _, and adjust the parameters v in the equation of state. The effects of v on the collapse of supernova star nucleus, the propagation of shock wave and the burst energy in the equation of state are discussed, which will provide the basis for the improvement of the equation of state. The results show that: 1. At the stage of star collapse, the value of YLc,Yec,Yvc remains unchanged with the increase of v, but the entropy of the center decreases and the value of pmaxc is smaller, that is, the equation of state is softer; 2. In the process of rebound, the higher v value, the larger the EvH, that is, the greater the energy of neutrino walking. However, the total binding energy of mass kinetic energy, internal energy and gravitational potential energy in the same mode region (the energy transferred from the core to the outer nucleus between t 4 and t 11) increases first and then decreases with the increase of v. In comparison, for different masses of precursors, the v value of the inner star's nucleus transferring to the maximum of the energy of the alien nucleus is not the same as that of the former star's. 3. 3. Under the four-particle model, when we investigate the effect of v variation on the burst energy of different solar mass models, we find that the best compression parameters of supernuclei density are different for different solar mass models. The results showed that vx2 was more suitable; These results indicate that v has an important effect on the collapse of supernova iron nuclei, energy transfer at shock wave propagation time and burst energy. This is of great significance for the study of supernova eruptions.
【学位授予单位】：广西师范大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：P145.3
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