Magnetohydrodynamic simulations of a rotating massive star collapsing to a black hole

Shin Ichirou Fujimoto, Kei Kotake, Shoichi Yamada, Masa Aki Hashimoto, Katsuhiko Sato

    Research output: Contribution to journalArticle

    55 Citations (Scopus)

    Abstract

    We perform two-dimensional, axisymmetric, magnetohydrodynamic simulations of the collapse of a rotating star of 40 M in light of the collapsar model of gamma-ray bursts. Considering two distributions of angular momentum, up to ∼ 1017 cm2 s-1, and the uniform vertical magnetic field, we investigate the formation of an accretion disk around a black hole and the jet production near the black hole. After material reaches the black hole with high angular momentum, the disk forms inside a surface of weak shock. The disk reaches a quasi-steady state for stars whose magnetic field is less than 1010G before the collapse. We find that the jet can be driven by the magnetic fields even if the central core does not rotate as rapidly as previously assumed as long as the outer layers of the star have sufficiently high angular momentum. The magnetic fields are chiefly amplified inside the disk due to the compression and the wrapping of the field. The fields inside the disk propagate to the polar region along the inner boundary near the black hole through the Alfvén wave and eventually drive the jet. The quasi-steady disk is not an advection-dominated disk but a neutrino cooling-dominated one. Mass accretion rates in the disks are greater than 0.01 M s-1 with large fluctuations. The disk is transparent for neutrinos. The dense part of the disk, which is located near the black hole, emits neutrinos efficiently at a constant rate of <8 × 1051 ergs s-1. The neutrino luminosity is much smaller than those from supernovae after the neutrino burst.

    Original languageEnglish
    Pages (from-to)1040-1055
    Number of pages16
    JournalAstrophysical Journal
    Volume644
    Issue number2 II
    DOIs
    Publication statusPublished - 2006 Jun 10

    Fingerprint

    magnetohydrodynamic simulation
    magnetohydrodynamics
    massive stars
    angular momentum
    magnetic field
    simulation
    neutrinos
    accretion
    polar region
    erg
    magnetic fields
    stars
    advection
    compression
    cooling
    quasi-steady states
    gamma ray bursts
    accretion disks
    polar regions
    supernovae

    Keywords

    • Accretion, accretion disks
    • Gamma rays: bursts
    • Methods: numerical
    • MHD
    • Supernovae: general

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Magnetohydrodynamic simulations of a rotating massive star collapsing to a black hole. / Fujimoto, Shin Ichirou; Kotake, Kei; Yamada, Shoichi; Hashimoto, Masa Aki; Sato, Katsuhiko.

    In: Astrophysical Journal, Vol. 644, No. 2 II, 10.06.2006, p. 1040-1055.

    Research output: Contribution to journalArticle

    Fujimoto, Shin Ichirou ; Kotake, Kei ; Yamada, Shoichi ; Hashimoto, Masa Aki ; Sato, Katsuhiko. / Magnetohydrodynamic simulations of a rotating massive star collapsing to a black hole. In: Astrophysical Journal. 2006 ; Vol. 644, No. 2 II. pp. 1040-1055.
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