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OBSERVATIONAL RESEARCH OF ACCRETION IN PROTOPLANETARY DISKS

Research Project

Project/Area Number 08640339
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionNATIONAL ASTRONOMICAL OBSERVATORY

Principal Investigator

HAYASHI Masahiko  NATIONAL ASTRONOMICAL OBSERVATORY,ASSOCIATE PROFESSOR, ハワイ観測所, 助教授 (10183914)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsStar Formation / Planetary System Formation / Protostars / Dynamical Collapse / Protoplanetary Disks / Accretion Disks
Research Abstract

In this research we investigated, through astronomical observations, dynamical collapse in star formation and formation of protoplanetary disks.
Direct evidence of dynamical infall was found around two new protostars during the research in the fiscal year 1996. Both objects showed rotation as well as infall at the envelope radius of about 1000AU (=Astronomical Unit), suggesting the presence of 100 AU scale protoplanetary disks around the central objects, which were actually confirmed from other observations. Our results hence gave firm evidence of protoplanetary disks, which would be the site of planetary system formation, to be formed through dynamical accretion in protostellar envelopes.
We then studied statistical characteristics of protostellar envelopes in the fiscal year 1997 based upon new observations, finding that, while the specific angular momentum of gas in envelopes is proportional to the 1.6-th power of the radius at radii larger than 0.03 parsec (pc), it is independent of radius and is constant at about 10^<-3> km s^<-1>pc at radii less than 0.03pc. This may mean that dynamical collapse in protostellar envelopes occurs inside radii of 0.03 pc and that, as a result, the gas keeps its specific angular momentum to form protoplanetary disks with their radii comparable to 100 AU.This new result naturally explains the 100 AU size scale of the solar system as well as that of protoplanetary disks.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] Oka, T.et al.: "CO(J=2-1) Line Observations of the Galactic Center Molecular Cloud Complex.I.On-Plane Structure" Astrophysical Journal. 460. 334-342 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N.et al.: "The Nobeyama Millimeter Array Survey of Young Stellar Objects associated with the Taurus Molecular Cloud" Astrophysical Journal. 466. 317-337 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N, et al.: "Possible Infall in the Gas Disk around L1551-IRS 5" Astrophysical Journal. 466. 957-963 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Momose, M.et al: "Dispersing Cloud Core around T Tauri" Astrophysical Journal. 470. 1001-1014 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hayashi, M.: "Observations of Protoplanetary Disks" Basic Physics of Acctetiom Disks. 247-252 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N.et al.: "Interferometric Imaging of IRAS 04368+2557 in the L1527 Molecular Cloud:A Dynamically Infalling Envelope with Rotation" Astrophysical Journal. 475. 211-223 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sakamoto, S.et al.: "Extensive High-Resolution ^<12>CO Imaging of L1641 in Orion" Astrophysical Journal. 481. 302-312 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N.et al.: "Rotation in the Protostellar Envelopes around IRAS 04169+2702 and IRAS 04365+2535:The Size Scale of Dynamical COllapse" Astrophysical Journal. 486. 317-329 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Lee, H.G.et al.: "NMA CS(J=2-1)Observations of IRAS 19550+3248" Publications of the Astronomical Society of Japan. 49. 639-645 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Oka, T., Nasegawa, T., Handa, T., Hayashi, M., and Sakamoto, S.: "CO (J=2-1) Line Observatins of the Galactic Center Molecular Cloud Complex. 1. On-Plane Structure" Astrophys.J.460. 334-342 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N., Hayashi, M., Kawabe, R., and Ishiguro, M.: "The Nobeyama Millimeter Array Surbey of Young Stellar Objects associated with the Taurus Molecular Cloud" Astrophys.J.466. 317-337 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N., Hayashi, M., Ho, P.T.P., Momose, M., Hirano, N.: "Possible Infall in the Gas Disk around L1551-IRS5" Astrophys.J.466. 957-963 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Momose, M., Ohashi, N., Kawabe, R., Hayashi, M., and Nakano, T.: "The Dispersing Cloud Core around T Tauri" Astrophys.J.470. 1001-1014 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hayashi, M.: "Observations of Protoplanetary Disks" In "Basic Physics of Accretion Disks, " eds.S.Kato et al, Gordon and Breach Science Publishers. 247-252 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N., Hayashi, M., Momose, M., and Ho, P.T.P.: "Interferometric Imaging of IRAS 04368+2557 in the L1527 Molecular Cloud : A Dynamically Infalling Envelope with Rotation" Astrophys.J. 475. 211-223 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sakamoto, S., Hasegawa, T., Hayashi, M., Morino, J.-1., and Sato, K.: "Extensive High-Resolution 12CO Imaging of L1641 in Orion" Astrophys.J. 481. 302-312 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi, N., Hayashi, M., Ho, P.T.P., Momose, M., Tamura, M., Hirano, N., and sargent, A.I.: "Rotation in the Protostellar Envelopes around IRAS 04169+2702 and IRAS 04365+2535 : The Size Scale for Dynamical Collapse" Astrophys.J.488. 317-329 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Lee, H.G., Koo, B.C., Park, Y.s., Hong, S.S., Roh, D.G,and Hayashi, M.: "NMA CS (J=2-1) Observations of IRAS 19550+3248" Publ.Astron.Soc.Japan. 49. 639-645 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohashi,N. et al.: "Interferometric Imaging of IRAS 04368+2557 in the L1527 Molecular Cloud:A Dynamically Infalling Envelope with Rotation" Astrophysical Journal. 475. 211-223 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Sakamoto,S. et al.: "Extensive High-Resolution ^<12>CO Imaging of L1641 in Orion" Astrophysical Journal. 481. 302-312 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Ohashi,N. et al.: "Rotation in the Protostellar Envelopes around IRAS 04169+2702 and IRAS 04365+2535:The Size Scale of Dynamical COllapse" Astrophysical Journal. 486. 317-329 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Lee,H.G. et al.: "NMA CS(J=2-1) Observations of IRAS 19550+3248" Publications of the Astronomical Society of Japan. 49. 639-645 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Oka,T. et al.: "CO(J=2-1) Observations of the Galactic Center Molecular Cloud Complex:ll.Dynamical Structure and Physical Conditions" Astrophysical Journal. (印刷中). (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Oka,T.et al.: "CO(J=2-1)Line Observations of the Galactic Center Molecular Cloud Complex. I.On-Plane Structure" Astrophysical Journal. 460. 334-342 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Ohashi,N.et al.: "The Nobeyama Millimeter Array Survey of Young Stellar Objects associated with the Taurus Molecular Cloud" Astrophysical Journal. 466. 317-337 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Ohashi,N.et al.: "Possible Infall in the Gas Disk around L1551-IRS5" Astrophysical Journal. 466. 957-963 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Momose,M.et al.: "Dispersing Cloud Core around T Tauri" Astrophysical Journal. 470. 1001-1014 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Hayashi,M.: "Observations of Protoplanetary Disks" Basic Physics of Accretion Disks. 247-252 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Ohashi,N.et al.: "Interferometric Imaging of IRAS04368+2557 in the L1527 Molecular Cloud : A Dynamically Infalling Envelope with Rotation" Astrophysical Journal. 475. 211-223 (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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