Numerical analysis of standing accretion shock instability with neutrino heating in supernova cores

Naofumi Ohnishi, Kei Kotake, Shoichi Yamada

    Research output: Contribution to journalArticle

    141 Citations (Scopus)

    Abstract

    We have numerically studied the instability of the spherically symmetric standing accretion shock wave against nonspherical perturbations. We have in mind the application to collapse-driven supernovae in the postbounce phase, where the prompt shock wave generated by core bounce is commonly stalled. We take an experimental standpoint in this paper. Using spherically symmetric, completely steady, shocked accretion flows as unperturbed states, we have clearly observed both the linear growth and the subsequent nonlinear saturation of the instability. In so doing, we have employed a realistic equation of state, together with heating and cooling via neutrino reactions with nucleons. We have performed a mode analysis based on the spherical harmonics decomposition and found that the modes with l = 1, 2 are dominant not only in the linear regime but also after nonlinear couplings generate various modes and saturation occurs. By varying the neutrino luminosity, we have constructed unperturbed states both with and without a negative entropy gradient. We have found that in both cases the growth of the instability is similar, suggesting that convection does not play a dominant role, which also appears to be supported by the recent linear analysis of the convection in accretion flows by Foglizzo et al. The oscillation period of the unstable l = 1 mode is found to fit better with the advection time rather than with the sound crossing time. Whatever the cause may be, the instability favors a shock revival.

    Original languageEnglish
    Pages (from-to)1018-1028
    Number of pages11
    JournalAstrophysical Journal
    Volume641
    Issue number2 I
    DOIs
    Publication statusPublished - 2006 Apr 20

    Fingerprint

    numerical analysis
    supernovae
    neutrinos
    shock
    accretion
    heating
    shock wave
    shock waves
    convection
    saturation
    spherical harmonics
    advection
    equation of state
    nucleons
    entropy
    equations of state
    oscillation
    luminosity
    perturbation
    decomposition

    Keywords

    • Hydrodynamics
    • Instabilities
    • Neutrinos
    • Supernovae: general

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Numerical analysis of standing accretion shock instability with neutrino heating in supernova cores. / Ohnishi, Naofumi; Kotake, Kei; Yamada, Shoichi.

    In: Astrophysical Journal, Vol. 641, No. 2 I, 20.04.2006, p. 1018-1028.

    Research output: Contribution to journalArticle

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