• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Unraveling the origin and evolution of r-process elements based on the interpretation of elemental abundances measured for stars and meteorites

Research Project

Project/Area Number 18H01258
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 16010:Astronomy-related
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Tsujimoto Takuji  国立天文台, JASMINEプロジェクト, 助教 (10270456)

Co-Investigator(Kenkyū-buntansha) 横山 哲也  東京工業大学, 理学院, 教授 (00467028)
Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2022: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywordsr過程元素 / 中性子星合体 / ブラックホール / 重力崩壊型超新星 / 隕石 / 同位体比異常 / 隕石同位体比分析 / 矮小銀河 / 超新星(強磁場超新星、コラプサー) / 隕石同位体分析 / 超新星(強磁場超新星、コラプサー) / radial migration / 球状星団 / 同位体分析 / 強磁場超新星 / 銀河化学力学進化 / 同位体異常
Outline of Final Research Achievements

The astrophysical origin of elements such as gold and platinum formed through rapid neutron-capture process, the so-called r-process, has been identified to be binary neutron star mergers through the detection of gravitational wave from the corresponding object in 2017 summer. Since this discovery, we have entered the era when the verification of neutron star mergers as the site of r-process is strongly desired. In this study, we have assessed this issue from the unique approaches using stellar abundances, the models for Galactic chemical evolution, and meteorite analysis. We eventually got to the conclusion that stellar abundances in the Galaxy are compatible with the hypothesis that rare core-collapse supernovae together with neutron star mergers are the origin of r-process elements. In addition, we find that the ejection of r-process elements from neutron star-black hole binaries is the another key factor for understanding the r-process evolution in the early Galaxy.

Academic Significance and Societal Importance of the Research Achievements

本研究成果は一般にも馴染みのある金やプラチナに代表される貴金属、レアアースといった元素の起源に関して新たな知見を与えるものである。地球で希少価値のあるこれらの元素が、宇宙において如何に稀な天体現象で作り出されてきたかを検証した結果、中性子星という究極の状態にある星同士が合体するという現象と非常に稀な種類の超新星爆発で生まれるという理論仮設を銀河化学進化の独自の視点から実証した。さらに、より稀な現象である中性子星とブラックホールの連星合体が貴金属を作る重要なサイトであることを明らかにし、ブラックホールと金との意外な関連性をも提示でき、社会的インパクトも大きい成果と言える。

Report

(6 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (88 results)

All 2024 2023 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (11 results) Journal Article (35 results) (of which Int'l Joint Research: 18 results,  Peer Reviewed: 35 results,  Open Access: 30 results) Presentation (42 results) (of which Int'l Joint Research: 17 results,  Invited: 15 results)

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

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] アンドレベロ大学(チリ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] 西オーストラリア大学(オーストラリア)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] 西オーストラリア大学(オーストラリア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] 西オーストラリア大学(オーストラリア)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] 西オーストラリア大学(オーストラリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Joint r-Process Enrichment with a Metallicity Threshold and Neutron Star Mergers2024

    • Author(s)
      Tsujimoto Takuji
    • Journal Title

      The Astrophysical Journal

      Volume: -

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phosphorus Enrichment by ONe Novae in the Galaxy2024

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

      The Astrophysical Journal Letters

      Volume: 967 Issue: 1 Pages: L1-L1

    • DOI

      10.3847/2041-8213/ad3fb6

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] JASMINE: Near-infrared astrometry and time-series photometry science2024

    • Author(s)
      Kawata Daisuke、Kawahara Hajime、Gouda Naoteru、et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: psae020 Issue: 3 Pages: 1-40

    • DOI

      10.1093/pasj/psae020

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Applicability of quartz tube digestion for the determination of highly siderophile and volatile chalcophile element abundances with Os isotopic compositions using ICP-MS/MS and N-TIMS2024

    • Author(s)
      Fujita Ryo、Nakano Shun、Yokoyama Tetsuya、Ishikawa Akira
    • Journal Title

      GEOCHEMICAL JOURNAL

      Volume: 58 Issue: 1 Pages: 9-27

    • DOI

      10.2343/geochemj.GJ24002

    • ISSN
      0016-7002, 1880-5973
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Exploring the Sun’s birth radius and the distribution of planet building blocks in the Milky Way galaxy: a multizone Galactic chemical evolution approach2023

    • Author(s)
      Baba Junichi、Saitoh Takayuki R、Tsujimoto Takuji
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 526 Issue: 4 Pages: 6088-6102

    • DOI

      10.1093/mnras/stad3188

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A model for GN-z11: top-heavy stellar initial mass functions in forming galactic nuclei and ultra-compact dwarfs2023

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

      Monthly Notices of the Royal Astronomical Society: Letters

      Volume: 526 Issue: 1 Pages: L26-L30

    • DOI

      10.1093/mnrasl/slad108

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Oxygen, sulfur, and iron radial abundance gradients of classical Cepheids across the Galactic thin disk2023

    • Author(s)
      da Silva R.、D’Orazi V.、Palla M.、Bono G.、Braga V. F.、Fabrizio M.、Lemasle B.、Spitoni E.、Matteucci F.、Jonsson H.、Kovtyukh V.、Magrini L.、Bergemann M.、Dall’Ora M.、Ferraro I.、Fiorentino G.、Francois P.、Iannicola G.、Inno L.、Kudritzki R.-P.、Matsunaga N.、Monelli M.、Nonino M.、..........、Tsujimoto T.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 678 Pages: A195-A195

    • DOI

      10.1051/0004-6361/202346982

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Metallicities of Classical Cepheids in the Inner Galactic Disk2023

    • Author(s)
      Matsunaga Noriyuki、Taniguchi Daisuke、Elgueta Scarlet S.、Tsujimoto Takuji、Baba Junichi、McWilliam Andrew、Otsubo Shogo、Sarugaku Yuki、Takeuchi Tomomi、Katoh Haruki、Hamano Satoshi、Ikeda Yuji、Kawakita Hideyo、Hull Charlie、Albarracin Rogelio、Bono Giuseppe、D’Orazi Valentina
    • Journal Title

      The Astrophysical Journal

      Volume: 954 Issue: 2 Pages: 198-198

    • DOI

      10.3847/1538-4357/aced93

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The VISCACHA survey. VIII. Chemical evolution history of the Small Magellanic Cloud west halo clusters2023

    • Author(s)
      Saroon S.、Dias B.、Tsujimoto T.、Parisi M. C.、Maia F.、Kerber L.、Bekki K.、Minniti D.、Oliveira R. A. P.、Westera P.、Katime Santrich O. J.、Bica E.、Sanmartim D.、Correa Quint B.、Fraga L.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 677 Pages: A35-A35

    • DOI

      10.1051/0004-6361/202346648

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Diffuse Neutrino Flux Based on the Rates of Core-collapse Supernovae and Black Hole Formation Deduced from a Novel Galactic Chemical Evolution Model2023

    • Author(s)
      Ashida Yosuke、Nakazato Ken'ichiro、Tsujimoto Takuji
    • Journal Title

      The Astrophysical Journal

      Volume: 953 Issue: 2 Pages: 151-151

    • DOI

      10.3847/1538-4357/ace3ba

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample2023

    • Author(s)
      Yokoyama Tetsuya、et al.
    • Journal Title

      Science Advances

      Volume: 9 Issue: 45

    • DOI

      10.1126/sciadv.adi7048

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Strontium isotope evidence for the repeated formation of refractory inclusions in the Allende meteorite2023

    • Author(s)
      Masuda, Y., Yokoyama, T.
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 345 Pages: 50-61

    • DOI

      10.1016/j.gca.2023.01.024

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evaluation of the Residual Mass Fractionation in High‐Precision Cr Isotopic Analysis with TIMS2023

    • Author(s)
      Yokoyama, T., Ohkuma, Y., Nishikawa, K., Sumiya, K., Gautam, I.
    • Journal Title

      Geostandards and Geoanalytical Research

      Volume: ― Issue: 2 Pages: 415-435

    • DOI

      10.1111/ggr.12479

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Very Metal-poor RR Lyrae Star with a Disk Orbit Found in the Solar Neighborhood2022

    • Author(s)
      Matsunaga、Itane、Hattori、Crestani、Braga、Bono、Taniguchi、Baba、Maehara、Ukita、Sakamoto、Kobayashi、Aoki、Soyano、Tarusawa、Sarugaku、Mito、Sako、Doi、Nakada、Izumi、Ita、Onozato、Jian、Kondo、Hamano、Yasui、Tsujimoto、Otsubo、Ikeda、Kawakita
    • Journal Title

      The Astrophysical Journal

      Volume: 925 Issue: 1 Pages: 10-10

    • DOI

      10.3847/1538-4357/ac3483

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Highly Sensitive, Non-cryogenic NIR High-resolution Spectrograph, WINERED2022

    • Author(s)
      Ikeda Yuji、Kondo Sohei、Otsubo Shogo、Hamano Satoshi、Yasui Chikako、Matsunaga Noriyuki、Sameshima Hiroaki、et al.
    • Journal Title

      Publications of the Astronomical Society of the Pacific

      Volume: 134 Issue: 1031 Pages: 015004-015004

    • DOI

      10.1088/1538-3873/ac1c5f

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Potential Signature of Population III Pair-instability Supernova Ejecta in the BLR Gas of the Most Distant Quasar at z = 7.542022

    • Author(s)
      Yoshii Yuzuru、Sameshima Hiroaki、Tsujimoto Takuji、Shigeyama Toshikazu、Beers Timothy C.、Peterson Bruce A.
    • Journal Title

      The Astrophysical Journal

      Volume: 937 Issue: 2 Pages: 61-61

    • DOI

      10.3847/1538-4357/ac8163

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] From Galactic chemical evolution to cosmic supernova rates synchronized with core-collapse supernovae limited to the narrow progenitor mass range2022

    • Author(s)
      Tsujimoto T
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 518 Issue: 3 Pages: 3475-3481

    • DOI

      10.1093/mnras/stac3351

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Geochemical constraints on the formation of chondrules: Implication from Os and Fe isotopes and HSE abundances in metals from CR chondrites2022

    • Author(s)
      Nakanishi Nao、Yokoyama Tetsuya、Okabayashi Satoki、Iwamori Hikaru、Hirata Takafumi
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 319 Pages: 254-270

    • DOI

      10.1016/j.gca.2021.11.009

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Chemical and Isotopic Evaluation of a Microsampling Method using Laser Ablation and Membrane Filter2022

    • Author(s)
      Masuda Yuki、Yokoyama Tetsuya、Okabayashi Satoki、Ishikawa Akira、Iwamori Hikaru
    • Journal Title

      Geostandards and Geoanalytical Research

      Volume: in press Issue: 2 Pages: 205-222

    • DOI

      10.1111/ggr.12426

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed
  • [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、Dai Wei、Hu Yan、Abe Yoshinari、Aleon Jerome、O’D. Alexander Conel M.、Amari Sachiko、Amelin Yuri ... Yabuta Hikaru ... et al.
    • Journal Title

      Nature Astronomy

      Volume: 7 Issue: 2 Pages: 182-189

    • DOI

      10.1038/s41550-022-01846-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / 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、Aleon Jerome、O’D. Alexander Conel M.、Amari Sachiko、Amelin Yuri、Bajo Ken-ichi、Bizzarro Martin、Bouvier Audrey ... Yabuta Hikaru ... et al.
    • Journal Title

      Science Advances

      Volume: 8 Issue: 46 Pages: 1-10

    • DOI

      10.1126/sciadv.add8141

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Absorption Lines in the 0.91?1.33 μm Spectra of Red Giants for Measuring Abundances of Mg, Si, Ca, Ti, Cr, and Ni2021

    • Author(s)
      Fukue Kei、Matsunaga Noriyuki、Kondo Sohei、Taniguchi Daisuke、Ikeda Yuji、Kobayashi Naoto、Sameshima Hiroaki、Hamano Satoshi、Arai Akira、Kawakita Hideyo、Yasui Chikako、Mizumoto Misaki、Otsubo Shogo、Takenaka Keiichi、Yoshikawa Tomohiro、Tsujimoto Takuji
    • Journal Title

      The Astrophysical Journal

      Volume: 913 Issue: 1 Pages: 62-62

    • DOI

      10.3847/1538-4357/abf0b1

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two Sites of r-process Production Assessed on the Basis of the Age-tagged Abundances of Solar Twins2021

    • Author(s)
      Tsujimoto Takuji
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 920 Issue: 2 Pages: L32-L32

    • DOI

      10.3847/2041-8213/ac2c75

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Variable refractory lithophile element compositions of planetary building blocks: Insights from components of enstatite chondrites2021

    • Author(s)
      Yoshizaki Takashi、Ash Richard D.、Lipella Marc D.、Yokoyama Tetsuya、McDonough William F.
    • Journal Title

      Geochimica et Cosmochimica Acta

      Volume: 308 Pages: 173-187

    • DOI

      10.1016/j.gca.2021.05.057

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nucleosynthesis: The Where and How2021

    • Author(s)
      Yokoyama Tetsuya、Tsujimoto Takuji
    • Journal Title

      Encyclopedia of Geology 2nd Edition

      Volume: 5 Pages: 1-19

    • DOI

      10.1016/b978-0-08-102908-4.00121-1

    • ISBN
      9780081029091
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Remarkable Migration of the Solar System from the Innermost Galactic Disk; a Wander, a Wobble, and a Climate Catastrophe on the Earth2020

    • Author(s)
      Tsujimoto Takuji、Baba Junichi
    • Journal Title

      The Astrophysical Journal

      Volume: 904 Issue: 2 Pages: 137-137

    • DOI

      10.3847/1538-4357/abc00a

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of Absorption Lines of Heavy Metals in the Wavelength Range 0.97-1.32 μm2020

    • Author(s)
      Matsunaga Noriyuki、Taniguchi Daisuke、Jian Mingjie、Ikeda Yuji、Fukue Kei、Kondo Sohei、Hamano Satoshi、Kawakita Hideyo、Kobayashi Naoto、Otsubo Shogo、Sameshima Hiroaki、Takenaka Keiichi、Tsujimoto Takuji、Watase Ayaka、Yasui Chikako、Yoshikawa Tomohiro
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 246 Issue: 1 Pages: 10-10

    • DOI

      10.3847/1538-4365/ab5c25

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] r-process enrichment in the Galactic halo characterized by nucleosynthesis variation in the ejecta of coalescing neutron star binaries2020

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

      The Astrophysical Journal

      Volume: 889 Issue: 2 Pages: 119-119

    • DOI

      10.3847/1538-4357/ab655c

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Separation of Heavy Lanthanoids by Flash Column Chromatography for Precise Determination of Er and Yb Isotope Compositions in Rock Samples2020

    • Author(s)
      Yokoyama Tetsuya、Fukai Ryota、Nakahara Masaki
    • Journal Title

      Geostandards and Geoanalytical Research

      Volume: in press Issue: 2 Pages: 265-285

    • DOI

      10.1111/ggr.12317

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Galactic r-process Abundance Feature Shaped by Radial Migration2019

    • Author(s)
      Tsujimoto, Takuji; Baba, Junichi
    • Journal Title

      The Astrophysical Journal

      Volume: 878 Issue: 2 Pages: 125-133

    • DOI

      10.3847/1538-4357/ab22b3

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A New Formation Model for ω Centauri: A Complex Interplay of Astrophysical Processes2019

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

      The Astrophysical Journal

      Volume: 886 Issue: 2 Pages: 121-121

    • DOI

      10.3847/1538-4357/ab464d

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Origin and Evolution of Distinct Molybdenum Isotopic Variabilities within Carbonaceous and Noncarbonaceous Reservoirs2019

    • Author(s)
      Yokoyama Tetsuya、Nagai Yuichiro、Fukai Ryota、Hirata Takafumi
    • Journal Title

      The Astrophysical Journal

      Volume: 883 Issue: 1 Pages: 62-62

    • DOI

      10.3847/1538-4357/ab39e7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] FeI lines in 0.91-1.33 micrometre spectra of red giants for measuring the microturbulence and metallicities2019

    • Author(s)
      Kondo S.、Fukue K.、Matsunaga N.、et al.
    • Journal Title

      The Astrophysical Journal

      Volume: in press

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nucleosynthetic Sr-Nd isotope correlation in chondrites: Evidence for nebular thermal processing and dust transportation in the early Solar System2019

    • Author(s)
      Fukai R.、 Yokoyama T.
    • Journal Title

      The Astrophysical Journal

      Volume: in press

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Early Chemical Evolution of Zn Driven by Magnetorotational Supernovae and the Pathway to the Solar Zn Composition2018

    • Author(s)
      Tsujimoto Takuji、Nishimura Nobuya
    • Journal Title

      The Astrophysical Journal

      Volume: 863 Issue: 2 Pages: L27-L27

    • DOI

      10.3847/2041-8213/aad86b

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Galactic and cosmic chemical evolutions, and their connection to neutrino astronomy2024

    • Author(s)
      Tsujimoto Takuji
    • Organizer
      Unraveling the History of the Universe and Matter Evolution with Underground Physics (UGAP2024)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 銀河の化学進化から探るr過程元素を作り出す超新星の個性2024

    • Author(s)
      辻本拓司
    • Organizer
      新学術「地下宇宙」第10回超新星ニュートリノ研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Chemistry, the IMF, and migration of the Galactic bulge2023

    • Author(s)
      Tsujimoto Takuji
    • Organizer
      The Galactic bulge and beyond
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 太陽系近傍データから迫るr過程元素の起源と進化2023

    • Author(s)
      辻本拓司
    • Organizer
      中性子捕獲反応で迫る宇宙の元素合成
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 狭範囲に限定された重力崩壊型超新星親星質量が示唆する銀河系化学進化と超新星頻度史2023

    • Author(s)
      辻本拓司
    • Organizer
      新学術「地下宇宙」第9回超新星ニュートリノ研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 超新星由来のr過程元素を強く示唆する銀河系化学進化2022

    • Author(s)
      辻本拓司
    • Organizer
      新学術「地下宇宙」第8回超新星ニュートリノ研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 太陽系大移動とスノーボールアース2022

    • Author(s)
      辻本拓司
    • Organizer
      宇宙線で繋ぐ文明・地球環境・太陽系・銀河
    • Related Report
      2021 Annual Research Report
  • [Presentation] 太陽系誕生地と移動に関する考察2022

    • Author(s)
      辻本拓司
    • Organizer
      天の川銀河研究会2022
    • Related Report
      2021 Annual Research Report
  • [Presentation] Origin of nucleosynthetic Sr isotope anomalies in fine grained calcium and aluminum-rich inclusions from Allende2022

    • Author(s)
      Masuda, Y., Yokoyama, T.
    • Organizer
      Lunar and Planetary Science Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Samarium and neodymium isotopic compositions of C-type asteroid (162173) Ryugu2022

    • Author(s)
      Torrano, Z. A., Jordan, M. K., Mock, T. D., Carlson, R. W., Yokoyama, T., Gautam, I., et al.
    • Organizer
      Lunar and Planetary Science Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Molybdenum and Osmium isotopic compositions of Ryugu sample2022

    • Author(s)
      Nakanishi, N., Ishikawa, A., Yokoyama, T., Walker, R. J.
    • Organizer
      Hayabusa Symposium 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 隕石の精密同位体分析に基づく銀河系化学進化とr核種の起源2022

    • Author(s)
      横山哲也
    • Organizer
      天の川銀河研究会2022
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 元素の起源と地球化学2022

    • Author(s)
      横山哲也
    • Organizer
      放射化学討論会2022
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Recent progress on the application of nucleosynthetic isotope anomalies in meteorites to elucidate the origin of r-process nuclides2022

    • Author(s)
      Yokoyama, T., Tsujimoto, T., Fukai, R.
    • Organizer
      JpGU 2022
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 超新星由来のr過程元素を強く示唆する銀河系化学進化2022

    • Author(s)
      辻本拓司
    • Organizer
      新学術「地下宇宙」第8回超新星ニュートリノ研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Origin of nucleosynthetic Sr isotope anomalies in fine grained calcium and aluminum-rich inclusions from Allende2022

    • Author(s)
      Masuda, Y., Yokoyama, T.
    • Organizer
      Lunar and Planetary Science Conference, The Woodlands, USA
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高精度Nd同位体比測定による平衡論的同位体効果の同定2021

    • Author(s)
      深井稜汰、 若木重行、 横山哲也
    • Organizer
      日本地球化学会2021年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Allende隕石中細粒CAIに見られる核合成起源のSr同位体異常の多様性2021

    • Author(s)
      増田雄樹、横山哲也
    • Organizer
      日本地球化学会2021年会
    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Presentation] 太陽系の銀河内軌道変化と地球の寒冷化2021

    • Author(s)
      辻本拓司
    • Organizer
      新学術「地下宇宙」第7回超新星ニュートリノ研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 高精度Nd同位体比測定による平衡論的同位体効果の同定2021

    • Author(s)
      深井稜汰, 若木重行, 横山哲也
    • Organizer
      日本地球化学会2021年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 近赤外線高分散分光器WINERED : Mg, Si, Ca, Ti, Cr, Niの化学組成導出に用いるYJバンド中の吸収線の選定2020

    • Author(s)
      福江慧、池田優二、河北秀世、松永典之、近藤荘平、谷口大輔、鮫島寛明、小林尚人、濱野哲史、安井千香子、辻本拓司、WINERED開発チーム
    • Organizer
      日本天文学会秋季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 太陽系大移動と地球の寒冷化2020

    • Author(s)
      辻本拓司
    • Organizer
      京都大学地球惑星科学セミナー
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Origin and evolution of distinct isotopic variabilities for Sr, Mo, and Nd within inner and outer solar system2020

    • Author(s)
      Yokoyama, T., Fukai, R., Nagai, Y., Hirata, T.
    • Organizer
      JpGU-AGU Joint meeting
    • Related Report
      2020 Annual Research Report
  • [Presentation] Origin and evolution of distinct isotopic variabilities for Sr, Mo, and Nd within CC and NC reservoirs (Keynote Talk)2020

    • Author(s)
      Yokoyama, T., Fukai, R., Nagai, Y., Hirata, T.
    • Organizer
      Goldschmidt Conference
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 隕石の重元素同位体異常にまつわる最近の話題2020

    • Author(s)
      横山哲也
    • Organizer
      研究会「星の錬金術から銀河考古学へ」
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Recent progress in the application of nucleosynthetic isotope anomalies in meteorites2020

    • Author(s)
      Yokoyama, T.
    • Organizer
      ISAS Colloquium
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 理論からの宇宙化学進化2019

    • Author(s)
      辻本拓司
    • Organizer
      第6回超新星ニュートリノ天文学
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Connection of r-process enrichment with the gravitational-wave detection rate2019

    • Author(s)
      Tsujimoto, T.
    • Organizer
      Gravitational wave physics and astronomy: Genesis, Third Annual Symposium
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 近赤外線YJバンドに存在するCuより重い元素の吸収線の同定2019

    • Author(s)
      松永典之、谷口大輔、Mingjie Jian、近藤荘平、小林尚人、鮫島寛明、池田優二、福江慧、河北 秀世、大坪翔悟、竹中慶一、渡瀬彩華、吉川智裕、濱野哲史、辻本拓司、安井千香子
    • Organizer
      日本天文学会春季年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Nucleosynthetic Sr and Nd isotopic anomalies of bulk differentiated meteorites2019

    • Author(s)
      Fukai, R., Sugimoto, K., Yokoyama, T.
    • Organizer
      Goldschmidt Conference
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Separation of heavy lanthanoids by flash column chromatography for precise determination of Er and Yb isotope compositions in rock samples2019

    • Author(s)
      Yokoyama, T.
    • Organizer
      4th China-Japan Joint Forum on Geochemistry and Cosmochemistry
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Nucleosynthetic Sr and Nd isotopic anomalies of bulk differentiated meteorites2019

    • Author(s)
      Fukai, R., Sugimoto, K., Yokoyama, T.
    • Organizer
      JpGU 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 宇宙化学進化とニュートリノ天文学2019

    • Author(s)
      辻本拓司
    • Organizer
      第5回超新星ニュートリノ研究会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Molybdenum isotopic evidence for nebular thermal processing and material transportation in the inner solar system2019

    • Author(s)
      Yokoyama T.、 Fukai R.、 Tsujimoto T.
    • Organizer
      Lunar and Planetary Science Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nucleosynthetic strontium-neodymium isotope correlation in chondrites: Evidence for nebular thermal processing and dust transportation in the early solar system2019

    • Author(s)
      Fukai R.、 Yokoyama T.
    • Organizer
      Lunar and Planetary Science Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 希土類元素創生:2018年宇宙の旅2018

    • Author(s)
      辻本拓司
    • Organizer
      日本希土類学会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] r-process study based on stellar abundances and meteorites2018

    • Author(s)
      Takuji Tsujimoto
    • Organizer
      Gravitational wave physics and astronomy: Genesis, Area Workshop
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Sporadic r-process events found in the Draco dwarf spheroidal galaxy2018

    • Author(s)
      Takuji Tsujimoto
    • Organizer
      IAU Symposium 344: Dwarf Galaxies: From the Deep Universe to the Present
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] r-process nucleosynthesis and enrichment2018

    • Author(s)
      Takuji Tsujimoto
    • Organizer
      Gravitational wave physics and astronomy: Genesis, Second Annual Symposium
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 星と隕石の化学組成に刻まれたr過程元素の起源と進化2018

    • Author(s)
      辻本拓司
    • Organizer
      重力波観測時代のrプロセスと不安定核
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Meteoritical perspective on the origin of r-process nuclides in the Solar System2018

    • Author(s)
      Yokoyama T.、 Fukai R.、 Tsujimoto T.
    • Organizer
      3rd Korea-Japan Joint Workshop on Isotope-Ratio Mass Spectrometry
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Nucleosynthetic Sr-;Nd correlation in bulk chondrites: Evidence for nebular thermal processing and transportation of refractory dusts in the early Solar System2018

    • Author(s)
      Fukai R.、 Yokoyama T.
    • Organizer
      Goldschmidt Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

URL: 

Published: 2018-04-23   Modified: 2025-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi