Influence of magnetorotational instability on neutrino heating: A new mechanism for weakly magnetized core-collapse supernovae

Hidetomo Sawai, Shoichi Yamada

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    We investigated the impact of magnetorotational instability (MRI) on the dynamics of weakly magnetized, rapidly rotating core-collapse supernovae by conducting high-resolution axisymmetric MHD simulations with simplified neutrino transfer. We found that an initially sub-magnetar-class magnetic field is drastically amplified by MRI and substantially affects the dynamics thereafter. Although the magnetic pressure is not strong enough to eject matter, the amplified magnetic field efficiently transfers angular momentum from small to large radii and from higher to lower latitudes, which causes the expansion of the heating region due to the extra centrifugal force. This then enhances the efficiency of neutrino heating and eventually leads to neutrino-driven explosion. This is a new scenario of core-collapse supernovae that has never been demonstrated by past numerical simulations.

    Original languageEnglish
    Article numberL10
    JournalAstrophysical Journal Letters
    Volume784
    Issue number1
    DOIs
    Publication statusPublished - 2014 Mar 20

    Fingerprint

    supernovae
    neutrinos
    magnetic field
    heating
    angular momentum
    simulation
    explosion
    magnetars
    centrifugal force
    tropical regions
    magnetic fields
    explosions
    conduction
    radii
    expansion
    causes
    high resolution

    Keywords

    • instabilities
    • magnetohydrodynamics (MHD)
    • methods: numerical
    • stars: magnetars
    • supernovae: general

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

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    abstract = "We investigated the impact of magnetorotational instability (MRI) on the dynamics of weakly magnetized, rapidly rotating core-collapse supernovae by conducting high-resolution axisymmetric MHD simulations with simplified neutrino transfer. We found that an initially sub-magnetar-class magnetic field is drastically amplified by MRI and substantially affects the dynamics thereafter. Although the magnetic pressure is not strong enough to eject matter, the amplified magnetic field efficiently transfers angular momentum from small to large radii and from higher to lower latitudes, which causes the expansion of the heating region due to the extra centrifugal force. This then enhances the efficiency of neutrino heating and eventually leads to neutrino-driven explosion. This is a new scenario of core-collapse supernovae that has never been demonstrated by past numerical simulations.",
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    AU - Yamada, Shoichi

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