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Formation and Evolution of Primitive Solar Nebula

Research Project

Project/Area Number 03640391
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Space and upper atmospheric physics
Research InstitutionUniversity of Tokyo

Principal Investigator

NAKAGAWA Yositsugu  Univ. of Tokyo, Faculty of Science, Research Associate., 理学部, 助手 (30172282)

Co-Investigator(Kenkyū-buntansha) SEKIYA Minoru  Teikyo Univ., Dept. of Mechanical and Precision System, Instructor., 理工学部, 講師 (60202420)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordssolar system origin / primitive solar nebula / solar nebula / protoplanetary disks / dust opacity / shear instability / T Tauri stars / gravitational instability / 原始惑星系円盤 / ダスト / Tタウリ型星 / 太陽系 / ガスーダスト円盤
Research Abstract

For these two years we studied formation and evolution of the solar nebula. Our research consists of the following these studies: (i) Over-reflection and over-transmission of non-axisymmetric waves in differentially rotating disks with self-gravity, (ii) Formation and early evolution of the solar nebula, (iii) Effect of particle growth on opacity curves of protoplanetary disks around T Tauri stars. We give brief summaries of these studies below.
Study(i): We quantitatively clarified phenomena of over-reflection and over-transmission of non- axisymmetric waves in differentially rotating disks and found that the self-gravity of the disks enhances these phenomena quite efficiently. These phenomena are considered as one of excitation mechanism of turbulence, and turbulence causes early evolution of the solar nebula.
Study(ii): We numerically simulated the processes of formation and early evolution of the solar nebula. We obtained radial temperature distribution in the solar nebula which is consistent with observation of protoplanetary disks around T Tauri stars. The temperature distribution is kept by surface heating due to infall gas and by viscous heating in the nebula. We also found that in the gas infall phase the solar nebula becomes gravitationally unstable at a radial distance comparable to the size of the present solar system.
Study(iii): We showed that dust growth in protoplanetary disks can quite naturally explain the diffrences in opacity between dust in protoplanetary disks and interstellar dust. We also showed that the opacity of grown dust gives an estimate of disk mass consistent with nominal solar nebula models.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Y.NAKAGAWA: "Wave action conservation、over-transmission of nonaxisymmetric waves in diffeventially rotating thin discs with self-grouty" Mon.Not.Roy.Astroll.Soc. 256. 685-694 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.NAKAMOTO: "For mation,EarlyEvolution,and Gravitational Stability of Protoplanetary Disks" Astrophyrical. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.MIYAKE: "Effects of panticle growth on opacity curves of protoplanetary disks araund T Touri stors" Icarus. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.NAKAMOTO: "Gravitational Stability of the solw Nebula" Proc.24th ISAS Lunar&Planetory Symp. 86-91 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.SEKIYA: "Shear Instability in the Solar Nebula" Proc:24th ISAS Lunar &Planetary Syup. 92-95 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.NAKAGAWA: "Over-reflection,Over-transmission,and Action conservation of Non-axisymmetric Waves in Differenrially potating Disks with selfgravity" origin and Evolution of the Solar System. 17. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y. Nakagawa and M. Sekiya: "Wave action conservation, Over-reflection and Over-transmission of nonaxisymmetric waves in differentially rotating disks with self-gravity." Mon. Not. Roy. Astron. Soc.256. 685-694 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T. Nakamoto and Y. Nakagawa: "Formation, Early Evolution, and Gravitational Stability of Protoplanetary Disks." Astrophysical Journal. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Miyake and Y. Nakagawa: "Effects of particle growth on opacity curves of protoplanetary disks around T Tauri stars." Icarus. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T. Nakamoto and Y. Nakagawa: "Gravitational Stability of the Solar Nebula." Proc. 24th ISAS Lunar & Planetary Symp.86-91 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M. Sekiya and S. M. Miyama: "Shear Instability in the Solar Nebula." Proc. 24th ISAS Lunar & Planetary Symp.92-95 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y. Nakagawa: "Over-reflection, Over-transmission, and Action Conservation of Non-axisymmetric Waves in Differentially Rotating Disks with Self-gravity." Origin and Evolution of the Solar System. 17 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Nakagawa: "Wave action conservation,over-reflection and over-transmission of nonaxisymmetric waves in differermtially rotating thin discs with self-grovity" Mon.Not.Roy.Astron.Soc. 256. 685-694 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Nakamoto: "For mation,Early Evolution,and Gravitational Stability of Protoplanetary Disks" Astrophysical Journal. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Miyake: "Effects of particle growth on opacity curved of protoplanetary disks around T Tauri stars" Icarus. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] T,Nakamoto: "Gravitational stabibity of the Solar Nebula" Proc:24th ISAS Lunar & Planetary Symp.86-91 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Sekiya: "Shear Lnstability in the Solar Nebula" Proc:24th ISAS Lunar & Planetary Symp.92-95 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Nakagawa: "Wave Action Conservation,OverーReflection and Overーtransmission of NonーAxisymmetric Waves in Differentially Rotating Thin Discs with SelfーGravity" Monthly Notices of Royal Astronomical Society. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Nakagawa: "Evolution of GasーDust Disks" Origin and Evolution of the Solar System (O.Schmidt Inst.of Phys.of Earth,Moscow). 17 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Sekiya: "Shear Instability in the Solar Nebula" Proc.24th ISAS Lunar Planet.Symposium. 24. 92-95 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Nakamoto: "Gravitational Stability of the Solar Nebula" Proc.24th ISAS Lunar Planet.Symposium. 24. 86-91 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] K.Ohtsuki: "Planetary Accretion in the Solar Gravitational Field" Protostars and Planets III (Univ.of Arizona Press). III. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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