The Intermediate r-process in Core-collapse Supernovae Driven by the Magneto-rotational Instability

N. Nishimura, H. Sawai, T. Takiwaki, Shoichi Yamada, F. K. Thielemann

    Research output: Contribution to journalArticle

    41 Citations (Scopus)

    Abstract

    We investigated r-process nucleosynthesis in magneto-rotational supernovae, based on a new explosion mechanism induced by the magneto-rotational instability (MRI). A series of axisymmetric magnetohydrodynamical simulations with detailed microphysics including neutrino heating is performed, numerically resolving the MRI. Neutrino-heating dominated explosions, enhanced by magnetic fields, showed mildly neutronrich ejecta producing nuclei up to A ∼ 130 (i.e., the weak r-process), while explosion models with stronger magnetic fields reproduce a solar-like r-process pattern. More commonly seen abundance patterns in our models are in between the weak and regular r-process, producing lighter and intermediate-mass nuclei. These intermediate r-processes exhibit a variety of abundance distributions, compatible with several abundance patterns in r-processenhanced metal-poor stars. The amount of Eu ejecta ∼ 10-5 M. in magnetically driven jets agrees with predicted values in the chemical evolution of early galaxies. In contrast, neutrino-heating dominated explosions have a significant amount of Fe (56Ni) and Zn, comparable to regular supernovae and hypernovae, respectively. These results indicate magneto-rotational supernovae can produce a wide range of heavy nuclei from iron-group to r-process elements, depending on the explosion dynamics.

    Original languageEnglish
    Article numberL21
    JournalAstrophysical Journal Letters
    Volume836
    Issue number2
    DOIs
    Publication statusPublished - 2017 Feb 20

    Fingerprint

    supernovae
    explosions
    explosion
    neutrinos
    ejecta
    heating
    magnetic field
    nuclei
    chemical evolution
    heavy nuclei
    nuclear fusion
    magnetic fields
    galaxies
    iron
    stars
    metal
    metals
    simulation

    Keywords

    • gamma-ray burst: general
    • magnetohydrodynamics (MHD)
    • neutrinos
    • nuclear reactions, nucleosynthesis, abundances
    • stars: neutron
    • supernovae: gene

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    The Intermediate r-process in Core-collapse Supernovae Driven by the Magneto-rotational Instability. / Nishimura, N.; Sawai, H.; Takiwaki, T.; Yamada, Shoichi; Thielemann, F. K.

    In: Astrophysical Journal Letters, Vol. 836, No. 2, L21, 20.02.2017.

    Research output: Contribution to journalArticle

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