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2022 Fiscal Year Annual Research Report

難揮発性包有物CAIから探る太陽系の誕生環境:ニオブ92をトレーサーとして

Research Project

Project/Area Number 20K14551
Research InstitutionThe University of Tokyo

Principal Investigator

日比谷 由紀  東京大学, 先端科学技術研究センター, 助教 (30867536)

Project Period (FY) 2020-04-01 – 2023-03-31
Keywords難揮発性包有物 / カラムクロマトグラフィー / 質量分析 / 超新星爆発
Outline of Annual Research Achievements

本研究は「太陽系誕生時における 92Nb(ニオブ-92)存在度分布の解明」を目的とする。具体的には、1 外側太陽系由来である炭素質コンドライトのうち始原的な CV, CRタイプの隕石からCAIを物理的に抽出し、2 研究代表者が開発した高精度クロム-チタン安定同位体測定法と 3 高精度ジルコニウム同位体比分析を組み合わせることにより、CAIがもつ太陽系内の位置情報と92Nb初期存在度の同時決定を試みる。既存値との比較を通して、太陽系の大質量星起源物質の初期分布の探索を行い、太陽系形成時の星間環境・物質循環に関する考察を行う。令和4年度には、複数のCVコンドライト隕石の厚片についてEPMAを用いた細粒CAI中の元素定量分析を行い、同位体分析を行うCAIの鉱物観察を行なった。CRコンドライト隕石についても探索を行なったものの、残念ながら分析に必要なサイズのCAIを見出すことができなかった。こちらについては、今後探索法を考えてあらためて試料を入手する予定である。また、テスト的にMC-ICPMSにおけるCAIのチタン同位体分析も行い、先行研究の結果と組み合わせることによって、CAI形成領域には92Nbが過剰に存在することも示唆された。今後、さらに試料を増やして検証を続けていく必要があるものの、本研究からはこれまでに、原始太陽系近傍での超新星爆発によって92Nbが太陽系円盤内に局所的に注入されたことが示唆された。本研究により、隕石中の微小構成物質の鉱物観察および同位体比分析の一連のフローを確立することができたことで、今後初期太陽系核種分布の研究を進めていく上での重要な足がかりとなった。

  • Research Products

    (32 results)

All 2023 2022 Other

All Int'l Joint Research (2 results) Journal Article (8 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 8 results,  Open Access: 6 results) Presentation (22 results) (of which Int'l Joint Research: 17 results)

  • [Int'l Joint Research] ブリュッセル自由大学(ベルギー)

    • Country Name
      BELGIUM
    • Counterpart Institution
      ブリュッセル自由大学
  • [Int'l Joint Research] ウィスコンシン大学(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      ウィスコンシン大学
  • [Journal Article] Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu2023

    • Author(s)
      Piani Laurette, Nagashima Kazuhide, Kawasaki Noriyuki et al. (23/88)
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 946 Pages: L43~L43

    • DOI

      10.3847/2041-8213/acc393

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evidence for Enrichment of Niobium-92 in the Outer Protosolar Disk2023

    • Author(s)
      Hibiya Yuki, Iizuka Tsuyoshi, Enomoto Hatsuki, Hayakawa Takehito
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 942 Pages: L15~L15

    • DOI

      10.3847/2041-8213/acab5d

    • Peer Reviewed / Open Access
  • [Journal Article] Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites2023

    • Author(s)
      Yokoyama Tetsuya, Nagashima Kazuhide, Nakai Izumi et al. (23/150)
    • Journal Title

      Science

      Volume: 379 Pages: eabn7850

    • DOI

      10.1126/science.abn7850

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild22022

    • Author(s)
      Kawasaki Noriyuki, Nagashima Kazuhide, Sakamoto Naoya et al. (27/94)
    • Journal Title

      Science Advances

      Volume: 8 Pages: eade2067

    • DOI

      10.1126/sciadv.ade2067

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis2022

    • Author(s)
      Paquet Marine, Moynier Frederic, Yokoyama Tetsuya et al. (24/93)
    • Journal Title

      Nature Astronomy

      Volume: 7 Pages: 182~189

    • DOI

      10.1038/s41550-022-01846-1

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System2022

    • Author(s)
      Hopp Timo, Dauphas Nicolas, Abe Yoshinari et al.(20/92)
    • Journal Title

      Science Advances

      Volume: 8 Pages: eadd8141

    • DOI

      10.1126/sciadv.add8141

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Solar System calcium isotopic composition inferred from Ryugu samples2022

    • Author(s)
      Moynier F., Dai W., Yokoyama T. et al. (24/94)
    • Journal Title

      Geochemical Perspectives Letters

      Volume: 24 Pages: 1~6

    • DOI

      10.7185/geochemlet.2238

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Presolar Stardust in Asteroid Ryugu2022

    • Author(s)
      Barosch Jens, Nittler Larry R., Wang Jianhua, et al. (40/123)
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 935 Pages: L3~L3

    • DOI

      10.3847/2041-8213/ac83bd

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] An Exploration of Hydrogen Content in Magnetite from Asteroid Ryugu.2023

    • Author(s)
      Aleon J. Mostefaoui S. Bureau H. Vangu D. Khodja H. The Hayabusa initial-analysis chemistry team.
    • Organizer
      Lunar and Planetary Science conference 2023
    • Int'l Joint Research
  • [Presentation] High Precision SIMS Oxygen Isotope Analyses of Carbonates in Ryugu.2023

    • Author(s)
      Kita N. T. Kitajima K. Kawasaki N. Nagashima K. Sakamoto N. Yurimoto H. The Hayabusa initial-analysis chemistry team.
    • Organizer
      Lunar and Planetary Science conference 2023
    • Int'l Joint Research
  • [Presentation] Ni Isotopic Composition of Ryugu Samples Returned by the Hayabusa2 Mission.2023

    • Author(s)
      Spitzer F, Burkhardt C. Kleine T. The, Hayabusa initial-analysis chemistry team, Hayabusa2-Initial-Analysis core
    • Organizer
      Lunar and Planetary Science conference 2023
    • Int'l Joint Research
  • [Presentation] Samarium and Neodymium Isotopic Compositions of C-Type Asteroid (162173) Ryugu.2023

    • Author(s)
      Torrano Z, A. Jordan M, K. Mock T, D. Carlson, R, W. Yokoyama, T, Gautam I. The, Hayabusa initial-analysis chemistry team
    • Organizer
      Lunar and Planetary Science conference 2023
    • Int'l Joint Research
  • [Presentation] Radiogenic, Nucleosynthetic, and Stable Isotope Isotope Variations in Strontium in Samples Returned by Hayabusa2 of Cb-Type Asteroid Ryugu.2023

    • Author(s)
      Wadhwa M, Masuda Y. Rai V, K. Gautum, I. Haba M, K. Yokoyama, T. The, Hayabusa initial-analysis chemistry team
    • Organizer
      Lunar and Planetary Science conference 2023
    • Int'l Joint Research
  • [Presentation] Evidence for Enrichment of Niobium-92 in the Outer Protosolar Disk2023

    • Author(s)
      Hibiya, Y, T. Iizuka, H. Enomoto, T. Hayakawa
    • Organizer
      2nd JCFos 2023年3月
    • Int'l Joint Research
  • [Presentation] 小惑星リュウグウ試料から見つかった特異的な炭素質物質と同位元素分布2022

    • Author(s)
      坂本 直哉, The Hayabusa2-initial-analysis chemistry team, The Hayabusa2-initial-analysis core
    • Organizer
      2022年度日本地球惑星科学連合大会
  • [Presentation] Titanium and Chromium isotope analyses of spherules in the Barberton greenstone belt2022

    • Author(s)
      日比谷 由紀, 吉屋 一美, 飯塚 毅, 山本 伸次, 小宮 剛, 鈴木 勝彦
    • Organizer
      2022年度日本地球惑星科学連合大会
  • [Presentation] リュウグウ試料中のオリビン,パイロキシン,スピネルの酸素同位体組成とその起源2022

    • Author(s)
      川崎 教行、永島 一秀、坂本 直哉、馬上 謙一、和田 壮平、圦本 尚義、The Hayabusa2-initial-analysis chemistry team, The Hayabusa2-initial-analysis core
    • Organizer
      2022年度日本地球惑星科学連合大会
  • [Presentation] Oxygen isotope compositions of aqueously formed minerals in Ryugu2022

    • Author(s)
      永島 一秀、川崎 教行、坂本 直哉、木多 紀子、北島 宏輝、圦本 尚義、The Hayabusa2-initial-analysis chemistry team, The Hayabusa2-initial-analysis core.
    • Organizer
      2022年度日本地球惑星科学連合大会
  • [Presentation] Relative abundances of light elements between Ryugu and Ivuna.2022

    • Author(s)
      N. Sakamoto, C. Park, N. Kawasaki, K. Nagashima, The Hayabusa initial-analysis chemistry team, The Hayabusa initial-analysis core
    • Organizer
      Goldschmidt Conference 2022
    • Int'l Joint Research
  • [Presentation] Presolar Grains in Asteroid Ryugu.2022

    • Author(s)
      J. Barosch, L. R. Nittler, The Hayabusa initial-analysis chemistry team, The Hayabusa initial-analysis core
    • Organizer
      Goldschmidt Conference 2022
    • Int'l Joint Research
  • [Presentation] Overview of initial analysis activity of Hayabusa2-returned sample from C-type near-Earth asteroid (162713) Ryugu.2022

    • Author(s)
      S. Tachibana, The Hayabusa initial analysis team
    • Organizer
      Goldschmidt Conference 2022
    • Int'l Joint Research
  • [Presentation] Cr and Ti isotope systematics of Ryugu samples.2022

    • Author(s)
      T. Yokoyama, T. Iizuka, I. Gautam, Y. Hibiya, M. K. Haba, Y. Masuda, R. Fukai, H. Yurimoto
    • Organizer
      Goldschmidt Conference 2022
    • Int'l Joint Research
  • [Presentation] Pb isotopic compositions of Ryugu samples and carbonaceous chondrites2022

    • Author(s)
      M. K. Haba, T. Yokoyama, Y. Masuda, I. Gautam, R, Fukai, The Hayabusa initial-analysis chemistry team, The Hayabusa initial-analysis core
    • Organizer
      Goldschmidt Conference 2022
    • Int'l Joint Research
  • [Presentation] バーバートン緑色岩体における隕石衝突起源スフェルールの探索2022

    • Author(s)
      日比谷 由紀, 吉屋 一美, 飯塚 毅, 山本 伸次, 小宮 剛, 鈴木 勝彦
    • Organizer
      2022年度 日本地球化学会 第69回年会
  • [Presentation] Chemical abundances in Ryugu, nugget effect, and cosmic composition.2022

    • Author(s)
      N. Dauphas, T. Yokoyama, R. Fukai, T. Usui, S. Tachibana, M. Schonbachler, A. M. Davis, H. Yurimoto, The Hayabusa initial-analysis chemistry team, The Hayabusa initial-analysis core
    • Organizer
      Hayabusa 2022 Symposium
    • Int'l Joint Research
  • [Presentation] Zinc, copper and calcium isotopic composition of Ryugu’s samples.2022

    • Author(s)
      F. Moynier, M. Paquet, W. Dai, T. Yokoyama, Y. HuThe, Hayabusa initial- analysis chemistry team, The Hayabusa initial-analysis core
    • Organizer
      Hayabusa 2022 Symposium
    • Int'l Joint Research
  • [Presentation] Oxygen isotope analyses of magnetite in Ryugu.2022

    • Author(s)
      N. T. Kita, K. Kitajima, K. Nagashima, N. Kawasaki, N. Sakamoto, H. Yurimoto, The Hayabusa initial-analysis chemistry team, The Hayabusa initial-analysis core
    • Organizer
      Hayabusa 2022 Symposium
    • Int'l Joint Research
  • [Presentation] Molybdenum and Osmium isotopic compositions of Ryugu sample.2022

    • Author(s)
      N. Nakanishi, A. Ishikawa, T. Yokoyama, R. J. Walker, The Hayabusa2-initial-analysis chemistry team, The Hayabusa2-initial-analysis core. Molybdenum and Osmium isotopic compositions of Ryugu sample.
    • Organizer
      Hayabusa 2022 Symposium
    • Int'l Joint Research
  • [Presentation] Oxygen and carbon isotope compositions of Ryugu’s carbonates: Constraints on the conditions of aqueous alteration.2022

    • Author(s)
      W. Fujiya, N. Kawasaki, K. Nagashima, C. M. O’D. Alexander, H. Yurimoto, The Hayabusa2-initial-analysis chemistry team, The Hayabusa2-initial-analysis core.
    • Organizer
      Hayabusa 2022 Symposium
    • Int'l Joint Research
  • [Presentation] Distinct ages and temperatures of aqueous activities recorded in Ryugu samples.2022

    • Author(s)
      K. Nagashima, N. Kawasaki, N. Sakamoto, W. Fujiya, H. Yurimoto, The Hayabusa2-initial-analysis chemistry team, The Hayabusa2-initial-analysis core
    • Organizer
      Hayabusa 2022 Symposium
    • Int'l Joint Research

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Published: 2023-12-25  

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