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1994 Fiscal Year Final Research Report Summary

Theoretical Study of the Thermal Histories of Comets and Parent Bodies of Meterorites

Research Project

Project/Area Number 05833011
Research Category

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

Allocation TypeSingle-year Grants
Research Field 惑星科学
Research InstitutionHokkaido University (1994)
Institute of Space and Astronautical Science (1993)

Principal Investigator

YAMAMOTO Tetsuo  Hokkaido University, DePartment of Earth and Planetary Science, Faculty of Science, Professor, 理学部, 教授 (10126196)

Project Period (FY) 1993 – 1994
KeywordsComet / Meteorite / Amorphous ice / Kuiper belt object / Interstellar dust / Planetary science
Research Abstract

The study of the origins and thermal histories of comets and parent bodies of meterorites leads to the following results :
1. A new model of the thermal history of cometary nuclei during residence in the Oort cloud has been obtained, in which particular attention has been paid to the extremely low thermal conductivity of amorphous ice is taken into account.
2. Conditions for condensation and preservation of amorphous ice have been theoretically derived. Crystallinity of ices in space has been discussed on the basis of the results.
3. Formation of organic materials has been studied by irradiating proton beams on simulated cosmic ices of various composition.
4. A tensile strength of grain aggregates has been derived, and the results have been applied to the splitting of comet Shoemaker-Levy 9.
5. The following study has also been done in relation to the results 1 to 4 : the origin of the Kuiper-belt objects, mesurements of infrared absorption coefficients of corundum grains, and infrared astronomical study of H_2O and CO ices in interstellar dark clouds.
Some of the results have been presented as a series of lectures at the International Summer School on Cosmic Dust Connection held at Erice in June 1994.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] J.Haruyama,T.Yamamoto,H.Mizutani and J.M.Greenberg: "Thermal History of Comets during Residence in the Oort Cloud -Effect of Radiogenic Heating under the Very Low Thermal Conductivity of Amorphous Ice" Journal of Goephysical Research. 98. 15,079-15,090 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Yamamoto,H.Mizutani,and A.Kadota: "Are 1992QB1 and 1993FW Remnant Planetesimals?" Publications of Astronomical Society of Japan. 46. L5-L9 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tanaka,T.Nagata,S.Sato,and T.Yamamoto: "The Nature of CO and H_2O Ices in the Corona Australis Molecular Clouds" Astrophysical Journal. 430. 779-785 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.M.Greenberg,H.Mizutani and T.Yamamoto: "A New Derivation of the Tensile Strength of Cometary Nuclei:Application to Comet Shoemaker-Levy9" Astronomy and Astrophysics. (in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kobayashi,T.Kaneko,M.Tsuchiya,S.Saito,T.Yamamoto,J.Koike,and T.Ohshima: "Formarion of Biiorganic Compounds in Planetary Atmosheres by Cosmic Radiation" Advances in Space Research. vol.15. (3)127-(3)130 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kouchi,T.Yamamoto,T.Kozasa,T.Kuroda,and J.M.Greenberg: "Conditions for Condensation and Preservation of Amorphous Ice and Crystallinity of Astrophysical Ices" Astronomy and Astrophysics. 290. 1009-1018 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Haruyama, T.Yamamoto, H.Mizutani and J.M.Greenberg: "Thermal History of Comets during Residence in the Oort Cloud-Effect of Radiogenic Heating under the Very Low Thermal Conductivity of Amorphous Ice" Journal of Goephysical Research. 98. 15,079-15,090 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Yamamoto, H.Mizutani, and A.Kadota: "Are 1992QB1 and 1993FW Remnant Planetesimals?" Publications of Astronomical Society of Japan. 46. L5-L9 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Tanaka, T.Nagata, S.Sato, and T.Yamamoto: "The Nature of CO and H_2O Ices in the Corona Australis Molecular Clouds" Astrophysical Journal. 430. 779-785 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Kouchi, T.Yamamoto, T.Kozasa, T.Kuroda, and J.M.Greenberg: "Conditions for Condensation and Preservation of Amorphous Ice and Crystallinity of Astrophysical Ices" Astronomy and Astrophysics. 290. 1009-1018 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kobayashi, T.Kaneko, M.Tsuchiya, S.Saito, T.Yamamoto, J.Koike, and T.Ohshima: "Formarion of Biiorganic Compounds in Planetary Atmosheres by Cosmic Radiation" Advances in Space Research. Vol.15, No.3. (3)127-(3)130 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.M.Greenberg, H.Mizutani and T.Yamamoto: "A New Derivation of the Tensile Strength of Cometary Nuclei : Application to Comet Shoemaker-Levy 9" Astronomy and Astrophysics. (in press). (1995)

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

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Published: 1996-04-15  

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