Nucleosynthesis in jets from a collapsar before the formation of a black hole

Shin Ichiro Fujimoto, Nobuya Nishimura, Masa Aki Hashimoto, Kei Kotake, Shoichi Yamada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We have investigated nucleosynthesis inside the jets from a 35 M , low-metallicity collapsar before the formation of a black hole, based on a two-dimensional magneto-hydrodynamic (MHD) simulation of the collapsar, taking into account neutrino interactions both on the MHD simulation and nucleosynthesis. We find that jets are ejected via the magnetic pressure, and that r-process operates in the jets even if the neutrino absorption is taken into account in the nucleosynthesis calculation. This is due to efficient electron captures in the high-density (∼ 10 11 gcm -3) region near the rotational axis, fast ejection (> 0.2 in units of speed of light), and relatively low neutrino luminosity (< 5 × 10 52ergss -1). Chemical composition of the neutron-rich nuclei in jets from collapsars with different mass and rotation could be largely different from each other.

    Original languageEnglish
    Title of host publicationProceedings of Science
    Publication statusPublished - 2008
    Event10th Symposium on Nuclei in the Cosmos, NIC 2008 - Mackinac Island, MI, United States
    Duration: 2008 Jul 272008 Aug 1

    Other

    Other10th Symposium on Nuclei in the Cosmos, NIC 2008
    CountryUnited States
    CityMackinac Island, MI
    Period08/7/2708/8/1

    Fingerprint

    nuclear fusion
    magnetohydrodynamic simulation
    neutrinos
    electron capture
    ejection
    metallicity
    chemical composition
    luminosity
    neutrons
    nuclei
    interactions

    ASJC Scopus subject areas

    • General

    Cite this

    Fujimoto, S. I., Nishimura, N., Hashimoto, M. A., Kotake, K., & Yamada, S. (2008). Nucleosynthesis in jets from a collapsar before the formation of a black hole. In Proceedings of Science

    Nucleosynthesis in jets from a collapsar before the formation of a black hole. / Fujimoto, Shin Ichiro; Nishimura, Nobuya; Hashimoto, Masa Aki; Kotake, Kei; Yamada, Shoichi.

    Proceedings of Science. 2008.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Fujimoto, SI, Nishimura, N, Hashimoto, MA, Kotake, K & Yamada, S 2008, Nucleosynthesis in jets from a collapsar before the formation of a black hole. in Proceedings of Science. 10th Symposium on Nuclei in the Cosmos, NIC 2008, Mackinac Island, MI, United States, 08/7/27.
    Fujimoto SI, Nishimura N, Hashimoto MA, Kotake K, Yamada S. Nucleosynthesis in jets from a collapsar before the formation of a black hole. In Proceedings of Science. 2008
    Fujimoto, Shin Ichiro ; Nishimura, Nobuya ; Hashimoto, Masa Aki ; Kotake, Kei ; Yamada, Shoichi. / Nucleosynthesis in jets from a collapsar before the formation of a black hole. Proceedings of Science. 2008.
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    abstract = "We have investigated nucleosynthesis inside the jets from a 35 M ⊙, low-metallicity collapsar before the formation of a black hole, based on a two-dimensional magneto-hydrodynamic (MHD) simulation of the collapsar, taking into account neutrino interactions both on the MHD simulation and nucleosynthesis. We find that jets are ejected via the magnetic pressure, and that r-process operates in the jets even if the neutrino absorption is taken into account in the nucleosynthesis calculation. This is due to efficient electron captures in the high-density (∼ 10 11 gcm -3) region near the rotational axis, fast ejection (> 0.2 in units of speed of light), and relatively low neutrino luminosity (< 5 × 10 52ergss -1). Chemical composition of the neutron-rich nuclei in jets from collapsars with different mass and rotation could be largely different from each other.",
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    AU - Nishimura, Nobuya

    AU - Hashimoto, Masa Aki

    AU - Kotake, Kei

    AU - Yamada, Shoichi

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