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Origin of Circumstellar Dust Clouds and Formation of Planetary Systems

Research Project

Project/Area Number 63540193
Research Category

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

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

NAKANO Takenori  Kyoto Univ., Dept. Physics, Associate Professor, 理学部, 助教授 (30027346)

Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1989: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
KeywordsSolar System / Planetary Systems / Circumstellar Dust / Infrared Objects / Beta Pictoris / かが座ベ-タ星 / 星周辺塵雲 / 遠赤外超過 / 太陽系の起源 / 画架座β星 / Vegalike stars
Research Abstract

I have investigated the formation of planetary systems around stars of various masses and obtained the following results.
1. By extending the Kyoto theory on planet formation I have shown that Neptune forms within the age of the Solar System, which the previous theories could not derive.
2. By applying this theory to stars other than the Sun I investigated what kind of stars can have planets. Because the time needed to form a planet is an increasing function of the distance from the star, there is an outer boundary to the region where planets form within the stellar lifetime. The outer boundary for a more massive star is closer to the star because of the shorter life. Because the temperature is high and solid material cannot exist near the star, there is an inner boundary to the region where planets form. The inner boundary is farther for a massive star because of the higher luminosity. Therefore the region where planets may form is smaller for more massive stars) and it disappears for stars more massive than about 10M<]SY.sun.[).
3. There have been two conflicting assertions on the density distribution in the beta Pictoris dust disk, n(gamma) alpha gamma^<-3> and n(gamma) alpha gamma^<-1>, where gamma is the distance from the star and the size of dust has been assumed the same everywhere. The observed surface brightness distribution along the midplane of the disk, which is approximated by a power law I(*) alpha *^<mu> with the index mu = 3.6-4.3, can be reproduced by the distribution of the scattering cross section per unit volume nsigma nsigma alpha gamma^<-1> only if the dust is much more strongly forward-scattering than the interplanetary dust which is responsible for the zodiacal light. Otherwise the distribution nsigma nsigma alpha gamma^<1-mu> can reproduce the observed surface brightness and is an appropriate distribution.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] 中野武宣: "Formation of planets around stars of various masses.II." Monthly Notices Roy.Astr.Soc.230. 551-571 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中野武宣: "Formation of planets around stars of various mases.III." Monthly Notices Roy.Astr.Soc.235. 193-201 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中野武宣: "Conditions for the formation of massive stars through nonspherical accretion" Astrophysical J.345. 464-471 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中野武宣: "Magnetic braking of the rotation of molecular cloud cores" Montyly Notices Roy.Astr.Soc.341. 495-505 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中野武宣: "Contraction of rotating magnetized clouds" Monthly Notices Roy.Astr.Soc.(1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中野武宣: "The density distribution in the Beta Pictoris dust disk." Astrophys.J.(Letters). (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano: "Formation of planets around stars of various masses. II. Stars of two and three solar masses and the origin and evolution of circumstellar dust clouds." Mon. Not. Roy. Astron. Soc., 230, No.4, 551-571, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano: "Formation of planets around stars of various masses. III. Massive and small-mass stars and the regions of planet formation." Mon. Not. Roy. Astron. Soc., 235, No.1, 193-201, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano: "Gravitational instability of magnetized gaseous disks." Publ. Astron. Soc. Japan, 40, No.5, 593-604, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano and T. Umebayashi: "Effects of magnetic fields on star formation." Prog. Theor. Phys. Suppl., No.96, 73-84, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Umebayashi and T. Nakano: "Ionization state and magnetic field in the Solar Nebula." Prog. Theor. Phys. Suppl., No.96, 151-160, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano: "Conditions for the formation of massive stars through nonspherical accretion." Astrophys. J., 345, No.1, 464-471, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano: "Magnetic braking of the rotation of molecular cloud cores." Mon. Not. Roy. Astr. Soc., 241, No.3, 495-505, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano: "Contraction of rotating magnetized clouds." Mon. Not. Roy. Astr. Soc., (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Umebayashi and T. Nakano: "Magnetic flux loss from interstellar clouds." Mon. Not. Roy. Astr. Soc., (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T. Nakano: "The density distribution in the Beta Pictoris dust disk." Astrophys. J. (Letters), (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 中野武宣: "Formation of planets around stars of various masses.II." Monthly Notices Roy.Astr.Soc.230. 551-571 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中野武宣: "Conditions for the formation of massive stars through nonsphevical accretion" Astrophysical J.345. 464-471 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中野武宣: "Magnetic braking of the rotation of molecular cloud cores" Monthly Notices Roy.Astr.Soc. 241. 495-505 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中野武宣: "Contraction of rotating magnetized clouds" Monthly Notices Roy.Astr.Soc. 243. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 梅林豊治: "Magnetic flux loss from interstellar clouds" Monthly Notices Roy.Astr.Soc.(1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中野武宣: "The density distribution in the Beta Pictoris dust disk" Astrophys.J.(Letters). (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中野武宣: Monthly Notices Roy,Astron.Soc.235. 193-201 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 中野武宣: Publ.Astron.Soc.Japan. 40. 593-604 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 中野武宣、梅林豊治: Prog.Theor.Phys.Suppl.96. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 梅林豊治、中野武宣: Prog.Theor.Phys.Suppl.96. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 中野武宣: Astrophys.J.344. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 中野武宣: "Galactic and Extragalactic Star Formation" Kluwer Academic Publ., 111-133 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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