R-process nucleosynthesis in the MHD+neutrino-heated collapsar jet

K. Nakamura, T. Kajino, G. J. Mathews, S. Sato, S. Harikae

    研究成果: Article

    13 引用 (Scopus)

    抄録

    It has been proposed that the collapsar scenario for long-duration gamma ray bursts is a possible astrophysical site for r-process nucleosynthesis. Here we present r-process nucleosynthesis calculations based upon a model for a MHD+neutrino-heated collapsar jet. We utilize a relativistic magnetohydrodynamic model that includes ray-tracing neutrino transport to describe the development of the black hole accretion disk and the neutrino heating of the funnel region above the black hole. The late time evolution of the collapsar jet is then evolved using axisymmetric special relativistic hydrodynamics. We employ representative test particles to follow the trajectories in density, temperature, entropy, and electron fraction for material flowing from the accretion disk into the jet until they are several thousand km above the black hole. The evolution of nuclear abundances from nucleons to heavy nuclei for ejected test particle trajectories was solved in a large nuclear reaction network as temperatures fall from 9 × 109 to 3 × 108 K. We show that an r-process-like abundance distribution forms in material ejected in the collapsar jet. The possibility for a signature of collapsar r-process material to be found in metal-poor stars is discussed.

    元の言語English
    記事番号A34
    ジャーナルAstronomy and Astrophysics
    582
    DOI
    出版物ステータスPublished - 2015 10 1

    Fingerprint

    nuclear fusion
    neutrinos
    accretion disks
    trajectory
    accretion
    funnels
    particle trajectories
    ray tracing
    heavy nuclei
    magnetohydrodynamics
    gamma ray bursts
    nuclear reactions
    nucleons
    entropy
    astrophysics
    temperature
    hydrodynamics
    signatures
    trajectories
    heating

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    これを引用

    Nakamura, K., Kajino, T., Mathews, G. J., Sato, S., & Harikae, S. (2015). R-process nucleosynthesis in the MHD+neutrino-heated collapsar jet. Astronomy and Astrophysics, 582, [A34]. https://doi.org/10.1051/0004-6361/201526110

    R-process nucleosynthesis in the MHD+neutrino-heated collapsar jet. / Nakamura, K.; Kajino, T.; Mathews, G. J.; Sato, S.; Harikae, S.

    :: Astronomy and Astrophysics, 巻 582, A34, 01.10.2015.

    研究成果: Article

    Nakamura, K. ; Kajino, T. ; Mathews, G. J. ; Sato, S. ; Harikae, S. / R-process nucleosynthesis in the MHD+neutrino-heated collapsar jet. :: Astronomy and Astrophysics. 2015 ; 巻 582.
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