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Revealing the initial conditions of moleuclar dense cores and investigating the origin of the angular momentum

Research Project

Project/Area Number 18K13595
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) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords原始惑星系円盤 / 分子雲コア / 星形成 / 惑星形成 / 電波天文 / 偏光 / 偏光観測
Outline of Final Research Achievements

The formation of stars and planetary systems is investigated by detailed observations of molecular cloud cores and millimeter-wave polarization observations of protoplanetary disks. Observations of the molecular cloud core reveal how the core splits due to gravitational instability and how multiple stars are born at the same time.
In the millimeter-wave polarization observation of the disk, we show that the polarization mechanism is different depending on the size of the dust by using observations and models. A detailed polarization model and comparison with observations show that the dust size of the protoplanetary disk HD 163296 is different between the rings and the gaps. Furthermore, it was found that the turbulence in this disk is smaller in the inner part of the disk.

Academic Significance and Societal Importance of the Research Achievements

地球を有する太陽系のような星・惑星系の形成を理解することは、太陽系や生命の起源だけでなく銀河形成などの宇宙論的な問題や宇宙の歴史を知るといった、宇宙科学の根源的な問いに答える。
本研究は、星形成を起こす直前の分子雲コアを詳細に観測し、その物理状態を明らかにすることで複数の星が重力不安定によって誕生する様子を示唆した。
さらに原始惑星系円盤ではミリ波偏光のメカニズムを新たに解明し、ダストサイズが偏光メカニズムを変える重要な要因であることを示し、実際にダストが円盤内で成長し惑星形成を開始する様子を捉えた。

Report

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

    (17 results)

All 2020 2019 2018

All Journal Article (8 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 8 results,  Open Access: 7 results) Presentation (9 results) (of which Int'l Joint Research: 8 results,  Invited: 1 results)

  • [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
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Radial Variations in Grain Sizes and Dust Scale Heights in the Protoplanetary Disk around HD 163296 Revealed by ALMA Polarization Observations2019

    • Author(s)
      Ohashi, Satoshi; Kataoka, Akimasa
    • Journal Title

      The Astrophysical Journal

      Volume: 886 Issue: 2 Pages: 103-103

    • DOI

      10.3847/1538-4357/ab5107

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] An Observational Study for Grain Dynamics in the AS 209 Disk with Submillimeter Polarization2019

    • Author(s)
      Mori Tomohiro、Kataoka Akimasa、Ohashi Satoshi、Momose Munetake、Muto Takayuki、Nagai Hiroshi、Tsukagoshi Takashi
    • Journal Title

      The Astrophysical Journal

      Volume: 883 Issue: 1 Pages: 16-16

    • DOI

      10.3847/1538-4357/ab3575

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nobeyama 45 m Cygnus-X CO Survey. II. Physical Properties of C18O Clumps2019

    • Author(s)
      Takekoshi Tatsuya、Fujita Shinji、Nishimura Atsushi、Taniguchi Kotomi、Yamagishi Mitsuyoshi、Matsuo Mitsuhiro、Ohashi Satoshi、Tokuda Kazuki、Minamidani Tetsuhiro
    • Journal Title

      The Astrophysical Journal

      Volume: 883 Issue: 2 Pages: 156-156

    • DOI

      10.3847/1538-4357/ab3a55

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Filamentary Accretion Flows in the Infrared Dark Cloud G14.225?0.506 Revealed by ALMA2019

    • Author(s)
      Chen Huei-Ru Vivien、Zhang Qizhou、Wright M. C. H.、Busquet Gemma、Lin Yuxin、Liu Hauyu Baobab、Olguin F. A.、Sanhueza Patricio、Nakamura Fumitaka、Palau Aina、Ohashi Satoshi、Tatematsu Ken’ichi、Liao Li-Wen
    • Journal Title

      The Astrophysical Journal

      Volume: 875 Issue: 1 Pages: 24-24

    • DOI

      10.3847/1538-4357/ab0f3e

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Two Different Grain Size Distributions within the Protoplanetary Disk around HD 142527 Revealed by ALMA Polarization Observation2018

    • Author(s)
      Ohashi Satoshi、Kataoka Akimasa、Nagai Hiroshi、Momose Munetake、Muto Takayuki、Hanawa Tomoyuki、Fukagawa Misato、Tsukagoshi Takashi、Murakawa Kohji、Shibai Hiroshi
    • Journal Title

      The Astrophysical Journal

      Volume: 864 Issue: 1 Pages: 81-81

    • DOI

      10.3847/1538-4357/aad632

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Gravitationally Unstable Condensations Revealed by ALMA in the TUKH122 Prestellar Core in the Orion A Cloud2018

    • Author(s)
      Ohashi Satoshi、Sanhueza Patricio、Sakai Nami、Kandori Ryo、Choi Minho、Hirota Tomoya、Nguy?n-Lu’o’ng Quang、Tatematsu Ken’ichi
    • Journal Title

      The Astrophysical Journal

      Volume: 856 Issue: 2 Pages: 147-147

    • DOI

      10.3847/1538-4357/aab3d0

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A warped disk around an infant protostar2018

    • Author(s)
      Sakai Nami、Hanawa Tomoyuki、Zhang Yichen、Higuchi Aya E.、Ohashi Satoshi、Oya Yoko、Yamamoto Satoshi
    • Journal Title

      Nature

      Volume: 565 Issue: 7738 Pages: 206-208

    • DOI

      10.1038/s41586-018-0819-2

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Observations for protoplanetary disks: From ALMA to ngVLA2019

    • Author(s)
      Satoshi Ohashi
    • Organizer
      next generation VLA workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Radial variations of grain size and turbulence in protoplanetary disks revealed by ALMA polarization2019

    • Author(s)
      Satoshi Ohashi
    • Organizer
      East-Asian ALMA Science Workshop 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Radial variations of grain sizes and dust scale heights of the protoplanetary disk around HD 163296 revealed by ALMA polarization observation2019

    • Author(s)
      Satoshi Ohashi
    • Organizer
      Planet Formation Workshop 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Understanding distributions of grain sizes and turbulence in protoplanetary disks2019

    • Author(s)
      Satoshi Ohashi
    • Organizer
      Science with the Submillimeter Array: Present and Future
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Radial variations of grain sizes and dust scale heights on the protoplanetary disk of HD 1632962019

    • Author(s)
      Satoshi Ohashi
    • Organizer
      ALMA2019: Science Results and Cross-Facility Synergies
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Grain size distributions in HD 163296 studied by ALMA polarization observation2019

    • Author(s)
      Satoshi Ohashi
    • Organizer
      Great Barriers in Planet Formation
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Radial variations of grain size in the HD 163296 protoplanetary disk revealed by ALMA polarization2019

    • Author(s)
      Satoshi Ohashi
    • Organizer
      Workshop on Polarization in Protoplanetary Disks and Jets
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 原始惑星系円盤HD 163296のALMAミリ波偏光観測で探るダスト分布2019

    • Author(s)
      大橋聡史、片岡章雅
    • Organizer
      日本天文学会2019年春季年会
    • Related Report
      2018 Research-status Report
  • [Presentation] Different Polarization Mechanisms in Protoplanetary Disks2018

    • Author(s)
      Satoshi Ohashi
    • Organizer
      First TagKASI International Conference: Cosmic Dust and Magnetism
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2021-02-19  

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