Influence Of Supernuclear-density Compression Parameter On Type Ⅱ Supernova Explosion

In this paper, the presupernova data of 11 M⊙,13M⊙,15M⊙,20M⊙,25M⊙,30M⊙,35M⊙and 40M⊙, proposed by Woosley in 2002, are used in SNII-WLYW89 program to simulate supernova explosion. By means of adjusting the supernuclear-density compression parameter v in the equation of state, its influence in core collapse, shock propagation and explosive energy are discussed, which will be significative to improve the model of supernova evolution.The results show that:1.In core collapse phase, with v become larger, YLc,Yec and YVc remain unchanged, but the entropy and density of the center (S and pmaxc) decreased. This means that the Equation of State with a larger v is softer than that with a smaller v; 2. In rebound process, a larger v will bring E" increasing, that is, neutrinos will carry away more energy in that case. However, in the same mold region, the material, total binding energy (Energy transferred from the core to the outer in the phase from t4 to t11), kinetic energy, internal energy and gravitational potential energy experience a process which firstly increase and then decrease although V increases monotonously. In contrast, the maximum total binding energy with different mass presupemova will be corresponding to a different v.3. Based on the four-particle model, for different mass presupernova, their maximum surpernova explosion energy didn't give a same value of v, and v=2 will be a appropriate value for all model in our study. These conclusions explain that v is important to supernovae core collapse, energy transfer of shock propagation time and explosion energy. And it will be significance to study of supernova explosions.