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Revealing the formation mechanism of the Milky Way stellar halo based on chemical abundance analyses of large datasets of metal-poor stars

Research Project

Project/Area Number 17K14249
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Astronomy
Research InstitutionTohoku University (2018-2019)
The University of Tokyo (2017)

Principal Investigator

Ishigaki Miho  東北大学, 理学研究科, 特任助教(研究) (30583611)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords銀河考古学 / 天の川銀河 / 恒星 / 元素組成 / スペクトル / 銀河系 / 元素合成 / 金属欠乏星 / 恒星分光学 / 初代星 / 銀河系形成 / 化学進化 / スペクトル解析 / 天文学 / 分光観測
Outline of Final Research Achievements

The ultimate purpose of this study is to reveal nucleosynthesis in the early Universe as well as the formation and chemical evolution of the Milky Way based on planed large spectroscopic surveys. The major achievements of this study are two folds. (1) Making use of archival spectroscopic data combined with latest astrometric data, we have constructed the library of standard stars for chemical abundance analyses, which can be used in upcoming spectroscopic surveys. Based on the candidate standard star's spectra from the archival data, physical quantities such as temperature and chemical composition have been derived. (2)We compared the models of nucleosynthetic products from supernovae and observed chemical compositions of old stars in the Milky Way. As a result, we have obtained a certain constraint on physical properties of the very first stars in the Universe.

Academic Significance and Societal Importance of the Research Achievements

本研究は、2020ー2030年代にかけて大きく進展が見込まれている天の川銀河の大規模恒星サーベイで最大限の成果を得るため、データ解析とデータ解釈の二つの側面で独自の貢献をすることができた。まずデータ解析では、世界最大級のすばる望遠鏡の過去のデータを最新の位置天文学データと連携させることで、大規模恒星サーベイにおいて広く有効活用できることを示した。さらにデータ解釈の面では、超新星爆発元素合成理論モデルを用いた研究を通して、天の川銀河に生き残る最古の恒星である金属欠乏星の観測から直接見ることのできない宇宙初期について観測的な証拠を得る「銀河考古学」のアプローチを具体的に示すものとなった。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (27 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (3 results) Journal Article (8 results) (of which Int'l Joint Research: 7 results,  Open Access: 8 results,  Peer Reviewed: 7 results) Presentation (14 results) (of which Int'l Joint Research: 13 results,  Invited: 10 results) Remarks (2 results)

  • [Int'l Joint Research] 中国国家天文台(中国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Universidad of Diego Portales(チリ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Diego Portales University(チリ)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Chemical abundances of field halo stars - Implications for the building blocks of the Milky Way2019

    • Author(s)
      Ishigaki Miho N.
    • Journal Title

      Proceedings of the International Astronomical Union

      Volume: 14 Issue: S351 Pages: 24-33

    • DOI

      10.1017/s1743921319007865

    • Related Report
      2019 Annual Research Report
    • Open Access
  • [Journal Article] Inferring the velocity of early massive stars from the abundances of extremely metal-poor stars2019

    • Author(s)
      Choplin, A., Tominaga, N., and Ishigaki, M. N.
    • Journal Title

      Astronomy & Astrophysics, Volume 632, id.A62, 26 pp.

      Volume: 632 Pages: A62-A62

    • DOI

      10.1051/0004-6361/201936187

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal-poor Star HE 1327-23262019

    • Author(s)
      Ezzeddine, R., Frebel, A., Roederer, I. U., Tominaga, N., Tumlinson, J., Ishigaki, M., Nomoto, K., Placco, V. M., and Aoki, W.
    • Journal Title

      The Astrophysical Journal, Volume 876, Issue 2, article id. 97, 8 pp. (2019).

      Volume: 876 Issue: 2 Pages: 97-97

    • DOI

      10.3847/1538-4357/ab14e7

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evidence for the accretion origin of halo stars with an extreme r-process enhancement2019

    • Author(s)
      Xing Qian-Fan、Zhao Gang、Aoki Wako、Honda Satoshi、Li Hai-Ning、Ishigaki Miho N.、Matsuno Tadafumi
    • Journal Title

      Nature Astronomy

      Volume: April Issue: 7 Pages: 631-635

    • DOI

      10.1038/s41550-019-0764-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Fingerprint of the first stars: multi-enriched extremely metal-poor stars in the TOPoS survey2019

    • Author(s)
      Hartwig, T., Ishigaki, M. N., Klessen, R. S., Yoshida, N.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 482 Issue: 1 Pages: 1204-1210

    • DOI

      10.1093/mnras/sty2783

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] LAMOST J221750.59+210437.2: A new member of carbon-enhanced extremely metal-poor stars with excesses of Mg and Si2018

    • Author(s)
      Aoki Wako、Matsuno Tadafumi、Honda Satoshi、Ishigaki Miho N、Li Haining、Suda Takuma、Kumar Yerra Bharat
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 70 Issue: 5 Pages: 1-10

    • DOI

      10.1093/pasj/psy092

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Foreground effect on the J-factor estimation of ultrafaint dwarf spheroidal galaxies2018

    • Author(s)
      Ichikawa, K., Horigome, S., Ishigaki, M. N., Matsumoto, S., Ibe, M., Sugai, H., Hayashi, K.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 479 Issue: 1 Pages: 64-74

    • DOI

      10.1093/mnras/sty1387

    • NAID

      130008148664

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Initial Mass Function of the First Stars Inferred from Extremely Metal-poor Stars2018

    • Author(s)
      Ishigaki, Miho N.; Tominaga, Nozomu; Kobayashi, Chiaki; Nomoto, Ken’ichi
    • Journal Title

      Astrophysical Journal

      Volume: 857 Issue: 1 Pages: 46-66

    • DOI

      10.3847/1538-4357/aab3de

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Interpreting spectroscopic survey data for metal-poor stars with supernova yield models2020

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      First Stars VI
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 未定(仮 Chemical enrichments by the first generation of stars probed by Milky Way halo stars)2020

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      First Stars VI in Concepcion, 01-06 March 2020
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Element production by supernovae across the cos- mic time probed by metal-poor stars2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      Fifty-One Ergs
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Chemical tagging with supernova yield models as a tool to link field stars to their birth clusters2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      IAU Symposium 351, Star Clusters: from the Milky Way to the Early Universe
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] PFS Galactic Archaeology survey2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      6th Galaxy Evolution Workshop
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] The effects of contamination on the estimation of dark matter annihilation profile of the Milky Way's dwarf spheroidal galaxies2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      43rd Johns Hopkins Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Interpreting spectroscopic survey data for metal-poor stars with supernova yield models2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      Wide-field-surveys of the Local Group and Nearby Galaxies, Subaru Telescope 20th Anniversary
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Chemical abundance patterns in the Milky Way halo stars as constraints on the element production in the early Universe2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      EAO Subaru Science Workshop 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Element production by supernovae across the cosmic time probed by metal-poor stars2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      FoE19 Fifty-one-Erg, an international workshop on the physics and observations of supernovae and supernova remnants
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Link between chemistry of field stars (also streams) and clusters2019

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      Star Clusters: from the Milky Way to the Early Universe, IAU Symposium 351
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The initial mass function of the first stars inferred from elemental abundances in extremely metal-poor stars2018

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      Stellar Archaeology as a Time Machine to the First Stars
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] A stellar high-resolution spectroscopic library based on the archival data of Subaru/HDS2018

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      The Life and Time of the Milky Way, The symbiosis between Gaia and grand-based spectroscopic surveys
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Galactic Archaeology with Prime Focus Spectrograph2018

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      The Life and Time of the Milky Way, The symbiosis between Gaia and grand-based spectroscopic surveys
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Implications of Extremely Metal-Poor stars on the Masses of the First Stars2017

    • Author(s)
      Miho N. Ishigaki
    • Organizer
      A Celebration of CEMP & Gala of GALAH workshop
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] 天の川銀河形成の名残を捉えることに成功 年老いた星の元素組成から矮小銀河合体の痕跡を発見

    • URL

      https://www.sci.tohoku.ac.jp/news/20190522-10288.html

    • Related Report
      2019 Annual Research Report
  • [Remarks] Researchmap

    • URL

      https://researchmap.jp/miho-n-ishigaki/

    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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