Long-term evolution of a collapsar

Shin Ichirou Fujimoto, Kie Kotake, Shoichi Yamada, Masa Aki Hashimoto

    Research output: Contribution to journalArticle

    Abstract

    During the collapse of a massive star greater than 35-40 M , stellar core is considered to promptly collapse to a black hole, and stellar material may fall onto the hole greater than several solar masses with extremely high accretion rates (> 1 M s -1). If the star has a sufficiently high angular momentum before the collapse, an accretion disk is likely to form around the black hole. Jets are suggested to be launched from the inner region of the accretion disk near the hole through magnetic and/or neutrino processes. Gamma-Ray Bursts (GRBs) are expected to be driven by the jets. This scenario of GRBs is called the collapsar model. Recently, magnetohydrodynamic (MHD) simulations were performed of the collapse of rapidly rotating, magnetized 25 M and 40 M stars in light of the collapsar model of GRBs (see papers listed at the end of the paper). For assumed angular velocity distributions and the uniform magnetic fields, the collapsars are shown to eject jets driven through the magnetic pressure. The simulations are however performed up to 4 s, which are shorter than durations of long GRBs ∼ 10 s. In the present work, we have performed long-term (∼ 10 s), two-dimensional, MHD simulations of the collapse of a rapidly rotating, magnetized 40 M star.

    Original languageEnglish
    Pages (from-to)1479-1480
    Number of pages2
    JournalNuovo Cimento della Societa Italiana di Fisica B
    Volume121
    Issue number12
    DOIs
    Publication statusPublished - 2006 Dec

    Fingerprint

    gamma ray bursts
    M stars
    magnetohydrodynamic simulation
    accretion disks
    stellar cores
    angular velocity
    massive stars
    neutrinos
    angular momentum
    velocity distribution
    stars
    magnetic fields
    simulation

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Long-term evolution of a collapsar. / Fujimoto, Shin Ichirou; Kotake, Kie; Yamada, Shoichi; Hashimoto, Masa Aki.

    In: Nuovo Cimento della Societa Italiana di Fisica B, Vol. 121, No. 12, 12.2006, p. 1479-1480.

    Research output: Contribution to journalArticle

    Fujimoto, Shin Ichirou ; Kotake, Kie ; Yamada, Shoichi ; Hashimoto, Masa Aki. / Long-term evolution of a collapsar. In: Nuovo Cimento della Societa Italiana di Fisica B. 2006 ; Vol. 121, No. 12. pp. 1479-1480.
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