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1995 Fiscal Year Final Research Report Summary

Construction of a solar nebula model considering the effect of magnetic field

Research Project

Project/Area Number 06832011
Research Category

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

Allocation TypeSingle-year Grants
Research Field 惑星科学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

SEKIYA Minoru  Kyushu University, Faculty of Science, Associate Professor, 理学部, 助教授 (60202420)

Co-Investigator(Kenkyū-buntansha) UMEBAYASHI Toyosharu  Yamagata University, Faculty of Science, Assistant Professor, 理学部, 助教授 (60183753)
Project Period (FY) 1994 – 1995
Keywordssolar system / solar nebula / magnetic field / protoplanetary disk / chondrule / cosmic dust / dust
Research Abstract

(1) Variation of the dissipation rate of the maganetic field due to the settling and the growth of the dust particles in the solar nebula is calculated. As a result, the dissipation rate of the magnetic field is found to decrease due to the settling and the growth of the dust. However, the magnetic field does not grow as to affect the evolution of the solar nebula. (2) The revision of the momentum transfer rate between an electron and a neutron is found to have little effect on the dissipation rate of the magnetic field. (3) Radiative equilibrium temperature of the solar nebula is calculated. As a result, temperature is found to be lower than of Hayashi's model (1981), and there are possibility that the nebula become unstable against convection even if it is transparent. (4) Numerical code of SPH method to calculate the evolution of the solar nebula due to eddy viscosity is developed. (5) Condition of chondrule formation is made clear, by observing compound chondrules and using the gravitational istability condition of the dust layr. Chondrules were probably made in the region much inner than the Asteroid belt. (6) Chemical reactions and condensation process on the dust particles in the protoplanetary disks are calculated. Especially, behavior of CO molecules are investigated in detail. As a result, it is found that almost all the CO molecules condense for less than 20 K, i. e. outer than 200 AU from the central star. (7) Numerical simulation of the entry of cosmic dust is performed. This simulation give the temperature experienced by a cosmic dust as a function of the entry angle and speed into the atmosphere.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 武田英徳: "Numerical simulation of viscous flow by smoothed particle hydrodynamics Progress of Theoretical Physics" Progress of Theoretical Physics. 92. 939-960 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 相川祐理: "Chemical evolution in protoplanetary disks -Interpretation of ‘CO depletion'" Proceedings of the ISAS Lunar and Planetary Symposium. 27. 87-90 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中村智樹: "Compound chondrules from antarctic carbonaceous and unequilibrated ordinary chondrites" Papers presented to the symposium on antarctic meteorites. 20. 179-181 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 関谷実: "Which occurred ealier,the settling of dust particles and the formation of chondrules in the solar nebula? -Implication from compound chondrules" Papers presented to the symposium on antarctic meteorites. 20. 225-227 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 関谷実: "Gravitational instabilities in a dust layer and the condition for the formation of compound chondrules" Proceedings of the ISAS Lunar and Planetary Symposium. 28. 73-76 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 矢田達: "Numerical simulation of I-type spherule formation" Proceedings of the ISAS Lunar and Planetary Symposium. 28. 169-172 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 関谷実: "原始太陽系星雲内のダストの振る舞い" 日本惑星科学会誌. 4. (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 関谷実: "Condition for the formation of the compound chondrules in the solar nebula" Proceedings of NIPR Symposium on Antarctic Meteorites. 9(掲載予定). 248-252 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 矢田達: "Formation process of magnetic spherules collected from deep-sea sediments -Observation and numerical simulation of the orbital evolution-" Proceedings of NIPR Symposium on Antarctic Meteorites. 9(掲載予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hidenori Takeda: "Numerical simulation of viscous flow by smoothed particle hydrodynamics" Progress of Theoretical Physics. Vol.92. 939-960 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yuri Aikawa: "Chemical evolution in protoplanetary disks -Interpretation of 'CO depletion'" Proceedings of the ISAS Lunar and Planetary Symposium. Vol.27. 87-90 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomoki Nakamura: "Compound chondrules from antarctic carbonaceous and unequilibrated ordinary chondrites" Papers presented to the symposium on antarctic meteorites. Vol.20. 179-181 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Minoru Sekiya: "Which occurred earlier, the settling of dust particles and the formation of chondrules in the solar nebula? - Implication from compound chondrules" Papers presented to the symposium on antarctic meteorites. Vol.20. 225-227 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Minoru Sekiya: "Gravitational instabilities in a dust layr and the condition for the formation of compound chondrules" Proceedings of the ISAS Lunar and Planetary Symposium. Vol.28. 73-76 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toru Yada: "Numerical simulation of I-type spherule formation" Proceedings of the ISAS Lunar and Planetary Symposium. Vol.28. 169-172 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Minoru Sekiya: "Behavior of dust in the primitive solar nebula (in Japanese)" Planetary people. Vol.4. 248-252 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Minoru Sekiya: "Condition for the formation of the compound chondrules in the solar nebula" Proceedings of the NIPR Symposium on Antarctic Meteorites. Vol.9 (to be published). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toru Yada: "Formation process of magnetic spherules collected from deep-sea sediments -Observation and numerical simulation of the orbital evolution-" Proceedings of the NIPR Symposium on Antarctic Meteorites. Vol.9 (to be published). (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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