Effects of the Temperature and Mass of Iron Cores on the Mass Ejection of Neutrino-Trapping Supernovae : Astrophysics and Relativity

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Effects of the neutrino trapping and the temperature, T_c, and/or mass of iron cores, M, on the mass ejection of neutrino-trapping supernovae are investigated with the aid of an idealized equation of state on the assumption of adiabatic collapse. It is found that 1) for a fixed T_c and/or M, the final stages of the collapse of Fe-cores are classified into the following three cases according to the trapped lepton fraction, Y_L; in the increasing order of Y_L, i) no ejection, ii) mass ejection due to the thermal expansion and iii) mass ejection by shock waves. 2) The critical values of Y_L distinguishing these cases increase with T_c and/or M. Therefore, if we adopt the value of the trapped lepton fraction Y_L=0.39, only cores less massive than 1.4 M_⦿ can make violent explosions. The physical interpretation of the above results and the detailed dependence of mass ejection on T_c and/or M are discussed.
理論物理学刊行会の論文
1984-03-25