Tables of hyperonic matter equation of state for core-collapse supernovae

摘要

We present sets of equation of state (EOS) of nuclear matter including hyperons using an SUf(3) extended relativistic mean field (RMF) model with a wide coverage of density, temperature and charge fraction for numerical simulations of core-collapse supernovae. Coupling constants of Sigma and Xi hyperons with the sigma meson are determined to fit the hyperon potential depths in nuclear matter, U-Sigma(rho(0)) similar or equal to + 30MeV and U-Xi(rho(0)) similar or equal to - 15 MeV, which are suggested from recent analyses of hyperon production reactions. At low densities, the EOS of uniform matter is connected with the EOS by Shen et al, in which the formation of finite nuclei is included in the Thomas - Fermi approximation. In the present EOS, the maximum mass of neutron stars decreases from 2.17M(circle dot) (Ne mu) to 1.63 M-circle dot (NY e mu) when hyperons are included. In a spherical, adiabatic collapse of a 15M(circle dot) star by the hydrodynamics without neutrino transfer, hyperon effects are found to be small, since the temperature and density do not reach the region of hyperon mixture, where the hyperon fraction is above 1 % (T > 40 MeV or rho(B) > 0.4 fm(-3)).