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Ring formation and dust growth in protoplanetary disks studied by ALMA polarization observations and radiative transfer calculations

Research Project

Project/Area Number 20K14533
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Ohashi Satoshi  国立研究開発法人理化学研究所, 開拓研究本部, 研究員 (50808730)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords惑星形成 / 原始惑星系円盤 / 電波天文観測 / 原始星円盤 / ダスト成長 / ALMA偏光観測 / 輻射輸送計算
Outline of Research at the Start

近年、ALMAによる高解像度の撮像観測によって、惑星の誕生現場である原始惑星系円盤に様々な構造が明らかになってきた。特に、リング構造が多くの円盤で観測され、このようなリングが惑星形成へとつながる可能性が指摘されている。
惑星形成の最初のステップは、星間空間にあるミクロンサイズの小さなダストが衝突合体し、ミリメートル以上のサイズへと成長する過程である。このダスト成長過程がリング上で起こっているのかを観測的に調べるため、ミリ波の散乱偏光観測とそれに基づく輻射輸送計算を行う。本研究で円盤におけるダストサイズと乱流分布を明らかにしていく。

Outline of Final Research Achievements

We have studied the dust growth process in protoplanetary disks through dust continuum observations with radio telescopes such as ALMA and VLA and dust coagulation growth simulations, and clarified the early stages of planet formation from both observational and theoretical perspectives. In addition, we have proposed dust growth fronts as one of the mechanisms of ring formation recently observed by ALMA and other telescopes.

Academic Significance and Societal Importance of the Research Achievements

惑星形成の初期段階が従来考えられていたよりも大幅に早く始まっていることを提唱した。
従来、惑星形成は中心の恒星への質量降着がほとんど終了し、原始惑星系円盤の静かな段階からゆっくりと始まると考えられていたが、本研究によって、惑星形成の始まりは、恒星の形成と同時期が始まっている可能性を示した。本研究は、惑星大気の主成分を決定する段階や、水のようなハビタブルな惑星がどのように形成されるのかといった、生命の起源にも大きな影響を与える。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (13 results)

All 2023 2022 2021 2020

All Journal Article (8 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results,  Open Access: 8 results) Presentation (5 results)

  • [Journal Article] Formation of Dust Clumps with Sub-Jupiter Mass and Cold Shadowed Region in Gravitationally Unstable Disk around Class 0/I Protostar in L1527 IRS2022

    • Author(s)
      Ohashi Satoshi、Nakatani Riouhei、Liu Hauyu Baobab、Kobayashi Hiroshi、Zhang Yichen、Hanawa Tomoyuki、Sakai Nami
    • Journal Title

      The Astrophysical Journal

      Volume: 934 Issue: 2 Pages: 163-163

    • DOI

      10.3847/1538-4357/ac794e

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] No Evidence of the Significant Grain Growth but Tentative Discovery of Disk Substructure in a Disk around the Class I Protostar L1489 IRS2022

    • Author(s)
      Ohashi Satoshi、Kobayashi Hiroshi、Sai Jinshi、Sakai Nami
    • Journal Title

      The Astrophysical Journal

      Volume: 933 Issue: 1 Pages: 23-23

    • DOI

      10.3847/1538-4357/ac6fcf

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Misaligned Rotations of the Envelope, Outflow, and Disks in the Multiple Protostellar System of VLA 1623-2417: FAUST. III2022

    • Author(s)
      Ohashi Satoshi、Codella Claudio、Sakai Nami、et al.
    • Journal Title

      The Astrophysical Journal

      Volume: 927 Issue: 1 Pages: 54-54

    • DOI

      10.3847/1538-4357/ac4cae

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). IV. Star Formation Signatures in G023.4772021

    • Author(s)
      Morii Kaho、Sanhueza Patricio、Nakamura Fumitaka、Jackson James M.、Li Shanghuo、Beuther Henrik、Zhang Qizhou、Feng Siyi、Tafoya Daniel、Guzman Andres E.、Izumi Natsuko、Sakai Takeshi、Lu Xing、Tatematsu Ken’ichi、Ohashi Satoshi、Silva Andrea、Olguin Fernando A.、Contreras Yanett
    • Journal Title

      The Astrophysical Journal

      Volume: 923 Issue: 2 Pages: 147-147

    • DOI

      10.3847/1538-4357/ac2365

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Ring Formation by Coagulation of Dust Aggregates in the Early Phase of Disk Evolution around a Protostar2021

    • Author(s)
      Ohashi, S., Kobayashi, H., Nakatani, R., Okuzumi, S., Tanaka, H., Murakawa, K., Zhang, Y., Liu, H. B., & Sakai, N.
    • Journal Title

      The Astrophysical Journal

      Volume: 907 Issue: 2 Pages: 80-80

    • DOI

      10.3847/1538-4357/abd0fa

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Solving Grain Size Inconsistency between ALMA Polarization and VLA Continuum in the Ophiuchus IRS 48 Protoplanetary Disk2020

    • Author(s)
      Ohashi, Satoshi; Kataoka, Akimasa; van der Marel, Nienke; Hull, Charles L. H.; Dent, William R. F.; Pohl, Adriana; Pinilla, Paola; van Dishoeck, Ewine F.; Henning, Thomas
    • Journal Title

      The Astrophysical Journal

      Volume: 900 Issue: 1 Pages: 81-81

    • DOI

      10.3847/1538-4357/abaab4

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks2020

    • Author(s)
      Tanaka Kei E. I.、Zhang Yichen、Hirota Tomoya、Sakai Nami、Motogi Kazuhito、Tomida Kengo、Tan Jonathan C.、Rosero Viviana、Higuchi Aya E.、Ohashi Satoshi、Liu Mengyao、Sugiyama Koichiro
    • Journal Title

      The Astrophysical Journal

      Volume: 900 Issue: 1 Pages: 1-11

    • DOI

      10.3847/2041-8213/abadfc

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Substructure Formation in a Protostellar Disk of L1527 IRS2020

    • Author(s)
      Nakatani Riouhei、Liu Hauyu Baobab、Ohashi Satoshi、Zhang Yichen、Hanawa Tomoyuki、Chandler Claire、Oya Yoko、Sakai Nami
    • Journal Title

      The Astrophysical Journal

      Volume: 895 Issue: 1 Pages: L2-L2

    • DOI

      10.3847/2041-8213/ab8eaa

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Multiple star formation in the VLA 1623-2417 region revealed by FAUST2023

    • Author(s)
      大橋聡史
    • Organizer
      日本天文学会2023年春季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Class I 原始星 L1489 における円盤形成初期のダスト成長と構造形成2022

    • Author(s)
      大橋聡史
    • Organizer
      日本天文学会2022年秋季年会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Misaligned rotations of the envelope, outflow, and disks in the triplet protostellar system of VLA 1623-24172021

    • Author(s)
      大橋聡史
    • Organizer
      日本天文学会2021年秋季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 原始星円盤におけるダスト成長前線によるリング形成2021

    • Author(s)
      大橋聡史
    • Organizer
      日本天文学会2021年春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] ALMAミリ波偏光観測とVLAセンチ波観測による原始惑星系円盤IRS48のダ ストサイズ分布2020

    • Author(s)
      大橋聡史
    • Organizer
      日本天文学会2020年秋季年会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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