The evolution toward electron capture supernovae

The flame propagation and the pre-bounce electron-neutrino radiation

Koh Takahashi, Kohsuke Sumiyoshi, Shoichi Yamada, Hideyuki Umeda, Takashi Yoshida

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    A critical-mass ONe core with a high ignition density is considered to end in gravitational collapse leading to neutron star formation. Being distinct from an Fe core collapse, the final evolution involves combustion flame propagation, in which complex phase transition from ONe elements into the nuclear statistical equilibrium (NSE) state takes place. We simulate the core evolution from the O+Ne ignition until the bounce shock penetrates the whole core, using a state-of-the-art 1D Lagrangian neutrino radiation hydrodynamic code, in which important nuclear burning, electron capture, and neutrino reactions are taken into account. Special care is also taken in making a stable initial condition by importing the stellar equation of state, which is used for the progenitor evolution calculation, and by improving the remapping process. We find that the central ignition leads to intense ν e radiation with L νe ≳ 10 51 erg s -1 powered by fast electron captures onto NSE isotopes. This pre-bounce ν e radiation heats the surroundings by the neutrino-electron scattering, which acts as a new driving mechanism of the flame propagation together with the adiabatic contraction. The resulting flame velocity of ∼10 8 cm s -1 will be more than one order of magnitude faster than that of a laminar flame driven by heat conduction. We also find that the duration of the pre-bounce ν e radiation phase depends on the degree of the core hydrostatic/dynamical stability. Therefore, the future detection of the pre-bounce neutrino is important not only to discriminate the ONe core collapse from the Fe core collapse but also to constrain the progenitor hydrodynamical stability.

    Original languageEnglish
    Article number153
    JournalAstrophysical Journal
    Volume871
    Issue number2
    DOIs
    Publication statusPublished - 2019 Feb 1

    Fingerprint

    flame propagation
    electron capture
    supernovae
    neutrinos
    electron
    radiation
    electrons
    ignition
    phase transition
    hydrostatics
    equation of state
    erg
    contraction
    combustion
    critical mass
    hydrodynamics
    scattering
    isotope
    gravitational collapse
    conductive heat transfer

    Keywords

    • abundances-stars: Evolution-supernovae: General
    • neutrinos-nuclear reactions
    • nucleosynthesis

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    The evolution toward electron capture supernovae : The flame propagation and the pre-bounce electron-neutrino radiation. / Takahashi, Koh; Sumiyoshi, Kohsuke; Yamada, Shoichi; Umeda, Hideyuki; Yoshida, Takashi.

    In: Astrophysical Journal, Vol. 871, No. 2, 153, 01.02.2019.

    Research output: Contribution to journalArticle

    Takahashi, Koh ; Sumiyoshi, Kohsuke ; Yamada, Shoichi ; Umeda, Hideyuki ; Yoshida, Takashi. / The evolution toward electron capture supernovae : The flame propagation and the pre-bounce electron-neutrino radiation. In: Astrophysical Journal. 2019 ; Vol. 871, No. 2.
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