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Unraveling the hypothesis that a neutron star merger is the origin of r-process elements, based on the understanding of galaxy evolution and nucleosynthesis

Research Project

Project/Area Number 15K05033
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Astronomy
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Tsujimoto Takuji  国立天文台, 光赤外研究部, 助教 (10270456)

Co-Investigator(Renkei-kenkyūsha) Wanajo Sinya  上智大学, 理工学部, 准教授 (30327879)
Ishigaki Miho  東京大学, カブリ数物連携宇宙研究機構, 研究員 (30583611)
Research Collaborator Nishimura Nobuya  
Bekki Kenji  
Gerhard Hensler  
Project Period (FY) 2015-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsr過程元素 / 中性子星合体 / 元素合成 / 銀河化学進化 / 磁気駆動型超新星 / 矮小銀河 / 銀河進化 / 強磁場超新星 / 隕石
Outline of Final Research Achievements

The astrophysical origin of elements formed through rapid neutron-capture process, so-called r-process, such as gold and platinum has not been identified yet. Last summer in 2017, we have caught the compelling signature of binary neutron star mergers as the site of r-process. However, we have only one sample and some observational results challenge the claim that a neutron star merger is the sole site of r-process. In this study, we have assessed this issue from the unique approach using stellar abundances as the diagnosis of r-process origin. We eventually got o the conclusion that stellar abundances in nearby dwarf galaxies support neutron star mergers as the r-process site but require specific supernovae -magnetorotational supernovae- at the early stage of galaxy evolution.

Report

(4 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (25 results)

All 2017 2016 2015 Other

All Int'l Joint Research (8 results) Journal Article (8 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 8 results,  Open Access: 8 results,  Acknowledgement Compliant: 3 results) Presentation (9 results) (of which Int'l Joint Research: 7 results,  Invited: 2 results)

  • [Int'l Joint Research] 西オーストラリア大学(オーストラリア)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] キール大学(英国)

    • Related Report
      2016 Research-status Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2016 Research-status Report
  • [Int'l Joint Research] 西オーストラリア大学(オーストラリア)

    • Related Report
      2016 Research-status Report
  • [Int'l Joint Research] キール大学(英国)

    • Related Report
      2015 Research-status Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2015 Research-status Report
  • [Int'l Joint Research] 西オーストラリア大学(オーストラリア)

    • Related Report
      2015 Research-status Report
  • [Journal Article] Enrichment in r-process Elements from Multiple Distinct Events in the Early Draco Dwarf Spheroidal Galaxy2017

    • Author(s)
      Tsujimoto Takuji、Matsuno Tadafumi、Aoki Wako、Ishigaki Miho N.、Shigeyama Toshikazu
    • Journal Title

      The Astrophysical Journal

      Volume: 850 Issue: 1 Pages: L12-L12

    • DOI

      10.3847/2041-8213/aa9886

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Formation of Globular Clusters with Internal Abundance Spreads in r-Process Elements: Strong Evidence for Prolonged Star Formation2017

    • Author(s)
      Bekki Kenji、Tsujimoto Takuji
    • Journal Title

      The Astrophysical Journal

      Volume: 844 Issue: 1 Pages: 34-34

    • DOI

      10.3847/1538-4357/aa77ae

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chemical evolution of 244Pu in the solar vicinity and its implication for the properties of r-process production.2017

    • Author(s)
      Tsujimoto, T., Yokoyama, T. and Bekki, K.
    • Journal Title

      Astrophys. J. Lett.

      Volume: 835 Issue: 1 Pages: L3-L3

    • DOI

      10.3847/2041-8213/835/1/l3

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Formation of Anomalous Globular Clusters with Metallicity Spreads: A Unified Picture2016

    • Author(s)
      Bekki, Kenji; Tsujimoto, Takuji
    • Journal Title

      The Astrophysical Journal

      Volume: 831 Issue: 1 Pages: 70-70

    • DOI

      10.3847/0004-637x/831/1/70

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Line-depth Ratios in H-band Spectra to Determine Effective Temperatures of G- and K-type Giants and Supergiants2015

    • Author(s)
      Fukue, Kei; Matsunaga, Noriyuki; Yamamoto, Ryo; Kondo, Sohei; Kobayashi, Naoto; Ikeda, Yuji; Hamano, Satoshi; Yasui, Chikako; Arasaki, Takayuki; Tsujimoto, Takuji; Bono, Giuseppe; Inno, Laura
    • Journal Title

      The Astrophysical Journal

      Volume: 812 Issue: 1 Pages: 64-64

    • DOI

      10.1088/0004-637x/812/1/64

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The r-process in Magnetorotational Supernovae2015

    • Author(s)
      Tsujimoto, Takuji; Nishimura, Nobuya
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 811 Issue: 1 Pages: L10-L10

    • DOI

      10.1088/2041-8205/811/1/l10

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] The Origin of Dust Extinction Curves with or without the 2175 A Bump in Galaxies: the Case of the Magellanic Clouds2015

    • Author(s)
      Bekki, Kenji; Hirashita, Hiroyuki; Tsujimoto, Takuji
    • Journal Title

      The Astrophysical Journal

      Volume: 810 Issue: 1 Pages: 39-39

    • DOI

      10.1088/0004-637x/810/1/39

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chemical feature of Eu abundance in the Draco dwarf spheroidal galaxy2015

    • Author(s)
      Tsujimoto, Takuji; Ishigaki, Miho N.; Shigeyama, Toshikazu; Aoki, Wako
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 67 Issue: 3

    • DOI

      10.1093/pasj/psv035

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] r-process enrichment traced by Pu and Ba near the sun and in the Draco2017

    • Author(s)
      Tsujimoto Takuji
    • Organizer
      Observational Signatures of r-process nucleosynthesis in neutron star mergers
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 太陽近傍および矮小銀河におけるr過程元素の起源と進化2017

    • Author(s)
      辻本拓司
    • Organizer
      天の川銀河研究会 2017
    • Related Report
      2017 Annual Research Report
  • [Presentation] Galactic Archaeology with Planetary Nebula study2017

    • Author(s)
      Tsujimoto Takuji
    • Organizer
      Planetary Nebula Research with Subaru Telescope in the Era of International Partnership
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 短寿命放射性核種244Puの太陽系における化学進化2016

    • Author(s)
      辻本拓司
    • Organizer
      日本質量分析学会同位体比部会
    • Place of Presentation
      秋田温泉さとみ(秋田県・秋田市)
    • Year and Date
      2016-11-16
    • Related Report
      2016 Research-status Report
  • [Presentation] r-process enrichment in the Milky Way and nearby dwarf galaxies2016

    • Author(s)
      Tsujimoto, Takuji
    • Organizer
      The Milky Way and its environment
    • Place of Presentation
      パリ天文研究所(フランス・パリ)
    • Year and Date
      2016-09-19
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Origin and evolution of r-nuclides in Local Universe2016

    • Author(s)
      Tsujimoto, Takuji
    • Organizer
      Goldschmidt
    • Place of Presentation
      パシフィコ横浜(神奈川県・横浜市)
    • Year and Date
      2016-06-27
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Observational constraints on r-process site & nucleosynthesis form dwarf galaxies, the Milky Way, and the solar system2016

    • Author(s)
      Tsujimoto, Takuji
    • Organizer
      The r-process nucleosynthesis: connecting FRIB with the cosmos
    • Place of Presentation
      ミシガン州立大学(アメリカ合衆国・ランシング)
    • Year and Date
      2016-06-06
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Chemical footsteps of r-nuclides in satellite galaxies of Local Group2015

    • Author(s)
      Tsujimoto, Takuji
    • Organizer
      In the Footsteps of galaxies: tracing the evolution of environmental effects
    • Place of Presentation
      ソヴェラート(イタリア)
    • Year and Date
      2015-09-07
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Chemical evolution of r-process elements in Draco dwarf spheroidal galaxies2015

    • Author(s)
      Nitta Ishigaki, Miho; Tsujimoto, Takuji; Shigeyama, Toshikazu; Aoki, Wako
    • Organizer
      IAU General Assembly, The general assembly of galaxy halos: structure, origin and evolution
    • Place of Presentation
      ホノルル、ハワイ(アメリカ合衆国)
    • Year and Date
      2015-08-03
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2022-02-16  

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