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

Chikako Ishizuka, Akira Ohnishi, Kohsuke Tsubakihara, Kohsuke Sumiyoshi, Shoichi Yamada

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    98 Citations (Scopus)

    Abstract

    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 Σ and Ξ hyperons with the σ meson are determined to fit the hyperon potential depths in nuclear matter, UΣ0) ≃ +30 MeV and UΞ0) ≃ -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 2.17 M (Neμ) to 1.63 M (NYeμ) when hyperons are included. In a spherical, adiabatic collapse of a 15 M 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 ρB > 0.4 fm-3).

    Original languageEnglish
    Article number085201
    JournalJournal of Physics G: Nuclear and Particle Physics
    Volume35
    Issue number8
    DOIs
    Publication statusPublished - 2008 Aug 1

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    hyperons
    supernovae
    equations of state
    M stars
    neutron stars
    neutrinos
    mesons
    hydrodynamics
    nuclei
    temperature
    approximation
    simulation

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Nuclear and High Energy Physics

    Cite this

    Tables of hyperonic matter equation of state for core-collapse supernovae. / Ishizuka, Chikako; Ohnishi, Akira; Tsubakihara, Kohsuke; Sumiyoshi, Kohsuke; Yamada, Shoichi.

    In: Journal of Physics G: Nuclear and Particle Physics, Vol. 35, No. 8, 085201, 01.08.2008.

    Research output: Contribution to journalArticle

    Ishizuka, Chikako ; Ohnishi, Akira ; Tsubakihara, Kohsuke ; Sumiyoshi, Kohsuke ; Yamada, Shoichi. / Tables of hyperonic matter equation of state for core-collapse supernovae. In: Journal of Physics G: Nuclear and Particle Physics. 2008 ; Vol. 35, No. 8.
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    AU - Yamada, Shoichi

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