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1991 Fiscal Year Final Research Report Summary

Origin of olivine particles in comets

Research Project

Project/Area Number 02640205
Research Category

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

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionKobe University

Principal Investigator

MUKAI Tadashi  Faculty of Science, Kobe Univ., Professor, 理学部, 教授 (10097412)

Co-Investigator(Kenkyū-buntansha) MUKAI Sonoyo  Fac. of Science and Technology, Kinki University, Professor, 理工学部, 教授 (00097411)
Project Period (FY) 1990 – 1991
Keywordscomets / cometary dust / origin of the solar system
Research Abstract

(1)The optical constants of olivine particles were measure in the wavelengths from 7 mum to 200 mum(Mukai and Koike 1990, Icarus 87, 180). These results have confirmed the hypothesis that olivine is a carrier of a twin-peaked structure in the 10 mum region observed in several-comets.
(2)Olivine particles, in general, are condenced at high temperatures(>1500 K). One possibility to explain the coexistence of olivine with icy particles inside the cometary nucleus is a radial transportation of particles near the sun to the region where the comet will be formed. We have examined the radiation pressure forces on porous aggragates to study a motion of olivine fluffy particles(Mukai et al. 1992, Astron. Astrophys. in press). It is found a significant difference of radiation forces on fluffy particles compared with those on compact spheres.
(3)We have shown(Mukai 1991, IAU Col. 126, Kluwer, p. 371)that a fragmentation of fluffy dust particles due to electrostatic forces caused by electric charges on irregularly shaped particle plays an important role in the production of very small particles detected in the cometary coma of Comet P/Halley.
(4)It is found(Mukai and Mukai 1990, Icarus 86, 257, Mukai et al. 1991, IAU Col. 126, Kluwer, p. 249)that these dust modelsfor fluffy aggregates can explain the photopolarimetric data observed in comets.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Mukai: "Radiation pressure forces on fluffy porous grains" Astron.Astrophys.(1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kouchi: "Extremely low thennal conductivity of amorphous ice:Relevance to comet evolution" Astrophys.J.Letter. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mukai: "Light scattering by rough surfaces on asteroidal/lunar regoliths" Adv.Space.Res.11. 137-140 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mukai: "Cometary Dust" "Primitive Solar Nebula and Origin of the Planets". (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Mukai: "Analysis of photopolarimetric data of comets at small phase angles by rough surface scattering" Icarus. 86. 257-263 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mukai: "Optical constants of olivine particles between wavelengths of 7 and 200 μm" Icarus. 87. 180-187 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Mukai, H. Ishimoto, T. Kozasa, J. Blum and J. M. Greenberg: "Radiation pressure forces on fluffy porous grains" Astron. Astrophys.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. Kouchi, J. M. Greenberg, T. Yamamoto and T. Mukai: "Extremely low thermal conductivity of amorphous ice : Relevance to comet evolution" Astrophys. J. Letter. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Mukai and S. Mukai: "Light scattering by rough surfaces on asteroidal/lunar regoliths" Adv. Space Res.11. 137-140 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Mukai: "Cometary Dust" "Primitive Solar Nebula and Origin of the Planets". Terra Sci. Publ. Comp.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mukai and T. Mukai: "Analysis of photopolarimetric data of comets at small phase angles by rough surface scattering" Icarus. 86. 257-263 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Mukai and C. Koike: "Optical constants of olivine particles between wavelengths of 7 and 200 um" Icarus. 87. 180-187 (1990)

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

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Published: 1993-03-16  

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