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Magnetohydrodynamic simulations of the final process of accretion process onto a protostar

Research Project

Project/Area Number 18K13579
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionOsaka University (2019-2021)
Nagoya University (2018)

Principal Investigator

Takasao Shinsuke  大阪大学, 理学研究科, 助教 (90794727)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords星形成 / 降着円盤 / 磁気流体力学 / 磁気流体シミュレーション
Outline of Final Research Achievements

The transition region between a protostar and a surrounding accretion disk is called the boundary layer. To update the evolution models of protostars, we need to understand the transport processes in this layer. It is particularly important to reveal the roles of magnetic fields, which have been ignored in most of the previous studies. We have conducted three-dimensional magnetohydrodynamic simulations of the accretion just around a protostar. We found that an accreting protostar can produce violent explosions that suddenly release magnetic energy. In addition, our simulation indicates that magnetic fields extract a large amount of angular momentum of the accreting gas in the connecting layer.

Academic Significance and Societal Importance of the Research Achievements

星は宇宙の最小構成要素であり、本研究はその誕生過程の一端を明らかにしたものである。特に原始星フレアは強いX線を生じて惑星形成のもととなる星形成領域の化学組成に影響を及ぼすことが言われていたが、原始星が進化のどの段階から強いX線を出すかについてはよくわかっていなかった。本研究は、原始星はこれまでよりも早い段階から強いX線を繰り返し出す可能性を理論的に示した。この結果は、太陽をはじめとする星の起源のみならず、その周りの惑星がどのような環境で生まれるのかについても示唆を与えるものである。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (39 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (9 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 9 results,  Open Access: 4 results) Presentation (29 results) (of which Int'l Joint Research: 11 results,  Invited: 8 results)

  • [Int'l Joint Research] プリンストン大学(米国)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Spontaneous Formation of Outflows Powered by Rotating Magnetized Accretion Flows in a Galactic Center2022

    • Author(s)
      Takasao Shinsuke、Shuto Yuri、Wada Keiichi
    • Journal Title

      The Astrophysical Journal

      Volume: 926 Issue: 1 Pages: 50-50

    • DOI

      10.3847/1538-4357/ac38a8

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Probing the Physics of the Solar Atmosphere with the Multi-slit Solar Explorer (MUSE). II. Flares and Eruptions2022

    • Author(s)
      Cheung Mark C. M. et al. (20th coauthor: Shinsuke Takasao)
    • Journal Title

      The Astrophysical Journal

      Volume: 926 Issue: 1 Pages: 53-53

    • DOI

      10.3847/1538-4357/ac4223

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Necessary Condition for Supernova Fallback Invading Newborn Neutron-star Magnetosphere2021

    • Author(s)
      Zhong Yici、Kashiyama Kazumi、Shigeyama Toshikazu、Takasao Shinsuke
    • Journal Title

      The Astrophysical Journal

      Volume: 917 Issue: 2 Pages: 71-71

    • DOI

      10.3847/1538-4357/ac0a74

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Hydrodynamic Model of Hα Emission from Accretion Shocks of a Proto-giant Planet and Circumplanetary Disk2021

    • Author(s)
      Takasao Shinsuke、Aoyama Yuhiko、Ikoma Masahiro
    • Journal Title

      The Astrophysical Journal

      Volume: 921 Issue: 1 Pages: 10-10

    • DOI

      10.3847/1538-4357/ac0f7e

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Corona and XUV emission modelling of the Sun and Sun-like stars2021

    • Author(s)
      Shoda Munehito、Takasao Shinsuke
    • Journal Title

      Astronomy & Astrophysics

      Volume: 656 Pages: A111-A111

    • DOI

      10.1051/0004-6361/202141563

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Accretion Properties of PDS 70b with MUSE2020

    • Author(s)
      Hashimoto Jun、Aoyama Yuhiko、Konishi Mihoko、Uyama Taichi、Takasao Shinsuke、Ikoma Masahiro、Tanigawa Takayuki
    • Journal Title

      The Astronomical Journal

      Volume: 159 Issue: 5 Pages: 222-231

    • DOI

      10.3847/1538-3881/ab811e

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comparative Study of Data-driven Solar Coronal Field Models Using a Flux Emergence Simulation as a Ground-truth Data Set2020

    • Author(s)
      Toriumi Shin、Takasao Shinsuke、Cheung Mark C. M.、Jiang Chaowei、Guo Yang、Hayashi Keiji、Inoue Satoshi
    • Journal Title

      The Astrophysical Journal

      Volume: 890 Issue: 2 Pages: 103-115

    • DOI

      10.3847/1538-4357/ab6b1f

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Giant Protostellar Flares: Accretion-driven Accumulation and Reconnection-driven Ejection of Magnetic Flux in Protostars2019

    • Author(s)
      Takasao Shinsuke、Tomida Kengo、Iwasaki Kazunari、Suzuki Takeru K.
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 878 Issue: 1 Pages: L10-L10

    • DOI

      10.3847/2041-8213/ab22bb

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] A New HLLD Riemann Solver with Boris Correction for Reducing Alfven Speed2019

    • Author(s)
      Matsumoto, Tomoaki; Miyoshi, Takahiro; Takasao, Shinsuke
    • Journal Title

      The Astrophysical Journal

      Volume: 874 Issue: 1 Pages: 37-37

    • DOI

      10.3847/1538-4357/ab05cb

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 磁気圏降着を受ける前主系列星からのウィンド2022

    • Author(s)
      高棹真介
    • Organizer
      CfCA ユーザーズミーティング
    • Related Report
      2021 Annual Research Report
  • [Presentation] 降着を受ける原始ガス惑星からのHα放射に関するシミュレーション2022

    • Author(s)
      高棹真介
    • Organizer
      形成中の惑星およびその兆候のALMA観測に向けた勉強会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 原始星の境界層降着に関する磁気流体計算2022

    • Author(s)
      高棹真介
    • Organizer
      日本天文学会2022年春季年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 太陽・星形成分野の問題解決に向けたアプローチについて2022

    • Author(s)
      高棹真介
    • Organizer
      SoLaBo-X Workshop
    • Related Report
      2021 Annual Research Report
  • [Presentation] Explosive magnetic energy release on the Sun and accreting young stars2021

    • Author(s)
      高棹真介
    • Organizer
      プラズマ・核融合学会第38回年会シンポジウム High-Temperature Plasma Dynamics and Structure Formation Based on Magnetic Field Diversity(磁場の多様性が拓く超高温プラズマダイナミクスと構造形成)
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 核周円盤への磁場の持ち込みと磁気駆動アウトフローの形成2021

    • Author(s)
      高棹真介
    • Organizer
      超巨大ブラックホール研究会:その実態・影響・起源の全貌解明に向けて
    • Related Report
      2021 Annual Research Report
  • [Presentation] Explosive phenomena on the Sun and protostars2021

    • Author(s)
      Shinsuke Takasao
    • Organizer
      High Energy Density Sciences 2021 (HEDS2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Solar-Stellar-Protostellar connection2021

    • Author(s)
      Shinsuke Takasao
    • Organizer
      5th Asia Pacific Conference on Plasma Physics (AAPPS-DPP2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spontaneous formation of magnetically driven outflows powered by galactic-scale accretion flows in a galactic center2021

    • Author(s)
      Shinsuke Takasao
    • Organizer
      East-Asia AGN workshop 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 3D MHD modeling of magnetospheric accretion from the turbulent disk2021

    • Author(s)
      Shinsuke Takasao
    • Organizer
      STAR FORMATION: FROM CLOUDS TO DISCS: A Tribute to the Career of Lee Hartmann
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical approaches for the understanding of particle acceleration during magnetic reconnection2021

    • Author(s)
      Shinsuke Takasao
    • Organizer
      Particle Acceleration in Solar Flares and the Plasma Universe -- Deciphering its features under magnetic reconnection
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 原始星における磁気圏降着構造の降着率依存性2021

    • Author(s)
      高棹真介
    • Organizer
      CfCA ユーザーズミーティング
    • Related Report
      2020 Research-status Report
  • [Presentation] Magnetically Arrested Diskの発現条件に関する理論研究2021

    • Author(s)
      高棹真介
    • Organizer
      日本天文学会2021年春季年会
    • Related Report
      2020 Research-status Report
  • [Presentation] 3D MHD simulations of an accreting young star2021

    • Author(s)
      高棹真介
    • Organizer
      Cool Stars 20.5
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 原始星・円盤相互作用モデルの現状2020

    • Author(s)
      高棹真介
    • Organizer
      新学術領域「星惑星形成」2020年度大研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Accretion processes just around protostars: roles of magnetic fields2020

    • Author(s)
      高棹真介
    • Organizer
      初代星初代銀河研究会2020@仙台
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 3D MHD simulation of magnetospheric accretion onto a protostar2020

    • Author(s)
      高棹真介
    • Organizer
      4th Asia Pacific Conference on Plasma Physics
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 磁気圏降着を受ける原始星のスピンダウンについて2020

    • Author(s)
      高棹真介
    • Organizer
      日本天文学会2020年春季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] 原始惑星系円盤内側領域の大域的非理想磁気流体シミュレーション2020

    • Author(s)
      高棹真介
    • Organizer
      ポスト「京」萌芽的課題・計算惑星 第4回 公開シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] 太陽と他の星の磁気活動を比較:原始星フレア、恒星コロナ2020

    • Author(s)
      高棹真介
    • Organizer
      太陽研究者連絡会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 磁気圏降着を受ける原始星の3次元磁気流体シミュレーション2020

    • Author(s)
      高棹真介
    • Organizer
      CfCAユーザーズミーティング
    • Related Report
      2019 Research-status Report
  • [Presentation] Three-dimensional MHD Simulations of Accretion onto Magnetized Stars2019

    • Author(s)
      高棹真介
    • Organizer
      Planet Formation Workshop 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical Investigation of the Accretion Process onto Protostars2019

    • Author(s)
      高棹真介
    • Organizer
      14th Asia-Pacific Physics Conference (APPC
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 原始星の磁気圏降着に関する3次元磁気流体シミュレーション2019

    • Author(s)
      高棹真介
    • Organizer
      理論懇シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] 磁気圏を持つ中心星への降着に関する3次元磁気流体シミュレーション2019

    • Author(s)
      高棹真介
    • Organizer
      日本天文学会2019年秋季年会
    • Related Report
      2019 Research-status Report
  • [Presentation] 原始星への降着に関する3次元磁気流体シミュレーション2019

    • Author(s)
      高棹真介
    • Organizer
      星・惑星形成再検討会
    • Related Report
      2019 Research-status Report
  • [Presentation] 原始惑星系円盤の降着が駆動する原始星フレア2019

    • Author(s)
      高棹真介
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 3D MHD Simulations of Accreting Young Stars2019

    • Author(s)
      Shinsuke Takasao
    • Organizer
      Athena++ workshop
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Accretion structure of inner protoplanetary disks2019

    • Author(s)
      Shinsuke Takasao
    • Organizer
      MAX PLANCK PRINCETON CENTER WORKSHOP 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2023-01-30  

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