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Physical Structure and Chemical Evolution during the Disk-Formation Process Traced by Sulfur-Bearing Species

Research Project

Project/Area Number 19K14753
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionThe University of Tokyo

Principal Investigator

Oya Yoko  東京大学, 大学院理学系研究科(理学部), 助教 (00813908)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords電波天文学 / 星形成 / 星間物質 / 星間化学
Outline of Research at the Start

本研究課題の目的は、太陽型原始星の形成に伴う物理的構造進化と物質進化を、硫黄を含む分子 (硫黄関連分子) を軸にして明らかにすることである。とくに、惑星系形成の場である原始惑星系円盤および原始星円盤の形成領域に着目し、半統計的数 (10~20個) の天体における硫黄関連分子の振る舞いを観測する。天体間での一般性と多様性を抽出するとともに、太陽系内での観測結果などと比較することで、惑星系形成領域の化学と太陽系化学の理解を、硫黄関連分子を軸にして結びつけることを目指す。加えて、硫黄関連分子の分布の特徴を類型化し、物理的構造進化を探るための化学診断への応用を確立する。

Outline of Final Research Achievements

This project aimed to understand the chemical evolution in planet-forming regions of Solar-type protostars by delineating the physical structures and chemical distributions in their disk-forming regions, including their mutual relation. To achieve this goal, we performed high sensitivity and high spatial-resolution radio observations, especially focusing on the sulfur-bearing species.
We delineated the complex physical structures in the vicinity of Solar-type protostellar sources with the molecular lines of various sulfur-bearing species. We found that the physical structure drastically changes from the envelope to the disk. Moreover, the sulfur-bearing species show chemical differentiation along with the change in the physical structure. We also found the diversity in the chemical compositions of sulfur-bearing species among Solar-type protostars. We suggested that this diversity can be originated from the initial gas and dust temperatures before the birth of protostars.

Academic Significance and Societal Importance of the Research Achievements

若い太陽型原始星まわりでの惑星系形成と、そこでの物質進化を探ることは、我々が住む地球のもつ豊かな環境の起源の理解に直結する重要な研究課題である。しかし、惑星系の母体である原始惑星系円盤が、原始星の周りに「いつ」「どのようにして」作られるのか、またそこでどのような物質進化が起きているのかについては、観測的にも理論的にも未開拓の領域として残されてきた。本研究課題では、太陽系内の彗星でも検出され注目を集める硫黄関連分子を軸に、惑星系形成領域における物理過程と物質進化の理解を前進させた。この成果は、惑星系形成領域と太陽系化学を結びつける端緒を与えると期待される。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (17 results)

All 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (13 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Int'l Joint Research] Universite Grenoble Alpes, IPAG(フランス)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Substructures in the Disk-forming Region of the Class 0 Low-mass Protostellar Source IRAS 16293?2422 Source A on a 10 au Scale2020

    • Author(s)
      Oya Yoko、Yamamoto Satoshi
    • Journal Title

      The Astrophysical Journal

      Volume: 904 Issue: 2 Pages: 185-216

    • DOI

      10.3847/1538-4357/abbe14

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Molecular Distributions of the Protostellar Envelope and the Outflow of IRAS 15398?3359: Principal Component Analysis2020

    • Author(s)
      Okoda Yuki、Oya Yoko、Sakai Nami、Watanabe Yoshimasa、Yamamoto Satoshi
    • Journal Title

      The Astrophysical Journal

      Volume: 900 Issue: 1 Pages: 40-59

    • DOI

      10.3847/1538-4357/aba51e

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sulfur-bearing Species Tracing the Disk/Envelope System in the Class I Protostellar Source Elias 292019

    • Author(s)
      Oya Yoko、Lopez-Sepulcre Ana、Sakai Nami、Watanabe Yoshimasa、Higuchi Aya E.、Hirota Tomoya、Aikawa Yuri、Sakai Takeshi、Ceccarelli Cecilia、Lefloch Bertrand、Caux Emmanuel、Vastel Charlotte、Kahane Claudine、Yamamoto Satoshi
    • Journal Title

      The Astrophysical Journal

      Volume: 881 Issue: 2 Pages: 112-128

    • DOI

      10.3847/1538-4357/ab2b97

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Circummultiple/Circumstellar Structures and Outflow near its Origin Point: the Multiple System IRAS 16293-2422 Source A Case2021

    • Author(s)
      Oya, Y.
    • Organizer
      East Asian ALMA Science Workshop 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ALMA観測による高解像度3次元データ解析への機械学習の導入2021

    • Author(s)
      大屋瑶子, 癸生川博文, 三宅祥太, 山本智
    • Organizer
      天文学会2021年春季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 速度構造を含めた3次元データにおけるPrincipal Component Analysis2021

    • Author(s)
      大小田結貴, 阿部正太郎, 駒木彩乃, 大屋瑶子, 山本智
    • Organizer
      天文学会2021年春季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Star Formation Feedback to a Parent Cloud: The Elias 29 Case2021

    • Author(s)
      Saiga,E., Oya, Y., Miotello, A., Ceccarelli, C., Codella, C., Chandler, C., Sakai, N., Yamamoto, S., & FAUST Team Members
    • Organizer
      天文学会2021年春季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 連星系 IRAS 16293-2422 A を取り巻く円盤構造と原始星円盤、およびアウトフローの関係2021

    • Author(s)
      大屋瑶子
    • Organizer
      惑星系形成若手研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Circummultiple/circumstellar Structures and Outflow near its Launching Point: the IRAS 16293-2422 Source A Case2020

    • Author(s)
      Oya, Y.
    • Organizer
      Five years after HL Tau: a new era in plane formation
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Class 0低質量原始星天体IRAS 16293-2422 Source Aのアウトフロー構造2020

    • Author(s)
      大屋瑶子, 山本智
    • Organizer
      天文学会2020年秋季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ALMAによるClass I原始星Elias 29のアウトフローの詳細構造2020

    • Author(s)
      雑賀恵理, 大屋瑶子, 山本智
    • Organizer
      天文学会2020年秋季年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] A 10 au Scale View of the Low-Mass Protostellar Source IRAS 16293-2422 Source A2020

    • Author(s)
      Y. Oya
    • Organizer
      East Asian ALMA Science Workshop 2019, Taipei
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Class 0 低質量原始星天体 IRAS 16293-2422 A の内部構造2020

    • Author(s)
      大屋瑶子、山本智
    • Organizer
      天文学会 2020 年春季年会 (オンライン公開のみ)
    • Related Report
      2019 Research-status Report
  • [Presentation] Unified Picture of Chemical Differentiation in Disk-Forming Regions of Young Low-Mass Protostellar Sources2019

    • Author(s)
      Y. Oya, & S. Yamamoto
    • Organizer
      SPICA 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 低質量原始星IRAS16293-2422の 10 au スケールでの円盤/エンベロープ構造2019

    • Author(s)
      大屋瑶子、山本智
    • Organizer
      天文学会 2019 年秋季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Sub-mm Views of Disk-Forming Regions in Young Low-Mass Protostellar Sources2019

    • Author(s)
      Y. Oya
    • Organizer
      East Asian ALMA Development Workshop 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2019-04-18   Modified: 2022-01-27  

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