Research On The Explosion Of Type â…¡ Supernova

In this paper, relevant physics process of evolutional stages in the presupernova was analyzed, and the explosion energy of the typeⅡsupernova instantaneous mechanism was studied.The kinds of typeⅡsupernova and their explosion mechanism, including the stellar evolution and the reason of causing collapse instability are illuminated. And the structure of the presupernova, especially those given by S. E Woosley et al in 2008, the physics problems and solutions in typeⅡsupernova are introduced in this paper. Besides, we summarized physical factors and numerical calculation method in typeⅡsupernova, such as electronic captured and the equation of state, array of difference and the general relativity hydrodynamic method. And then, the collaspsed, bounce and shock wave of typeⅡsupernova under new models are discussed in detail, and the explosion of typeⅡsupernovae is studied by changing parameter of the equation of the state.The structure of presupernova affects typeⅡsupernova's evolution mode, and plays an important role in the explosion of supernova. The evolution of the supernova are very sensitive to model parameters chosed.Especially, the model parameters of the equation of the stats will change the supernova's results markedly. In this paper, we used new presupernova model, which advanced by Heger and Woosley S. E, to investigate the shock wave propagation, collapse, nuclear energy of the core collapse supernova, and the lower mass limit of the supernova explosion. Through softening the equation of the state, our model can achieve explosion. And analysed results show that:because material mixing and fallback are taken into account in these new models, the initial density output are bigger than before. Compared the results with WW02's, the collapse timeτ(1)couap of the models with presupernova mass of 12 M☉,13 M☉,14 M☉are increased, but that with mass of 15M☉is decreased. And to shock waves propagation, propagation speed in new models are a bit lower than that with WW02's, but it will took more time than before.It shows that the shock wave propagation having a very good stability. For the explosion energy, only the model with a mass of 14M☉is more than that with old presurpernave data, this is due to smaller light dissociation energy and neutrino energy lost for that model. When we structure instantaneous explosion model of typeⅡsupernova, the nuclear physical constants cb and nuclear material compression modulus k0 are modified to get a "better parameter group" to achieve explosion. The conclusion shows that the new presupernova model for containing material mixing and fallback are more reasonable and more actual, which has an important influence on the explosion of supernova. It is great significance in the explosion of supernova.