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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
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1990: ¥900,000 (Direct Cost: ¥900,000)
Keywordscomets / cometary dust / origin of the solar system / 光散乱 / 光学定数
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.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [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
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T.Mukai: "Radiation pressure forces on fluffy porous grains" Astron.Astrophys.(1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] A.Kouchi: "Extremely low thermal conductivity of amorphous ice:Relevance to comet evolution" Astrophys,J.Letter. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Mukai: "Light scattering by rough surfaces on asteroidal/lunar regoliths" Adu.Space Res.11. 137-140 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Mukai: "Cometary Dust" “Primitive Solar Nebula and Origin of the Planets". (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] S.Mukai: "Analysis of photopolarimetric data of comets at small phase angles by rough surface scattering" Icarus. 86. 257-263 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Mukai: "Optical constants of olivine particles between wavelengths of 7 and 200μm" Icarus. 87. 180-187 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] Tadashi Mukai: "Optical Constants of Olivine Particles between Wavelengths of 7 and 200 μm" Icarus. 87. 180-187 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Sonoyo Mukai: "Analysis of Photopolarimetric Data of Comets at Small Phase Angles by Rough Surface Scattering" Icarus. 86. 257-263 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Tadashi Mukai: "Electrostatic Fragmentation of Irregularly Shaped Particles" Origin and Evolution of Interplanetary Dust.

    • Related Report
      1990 Annual Research Report
  • [Publications] Sonoyo Mukai: "Scattering Properties of Cometary Dust based on Polarimetric Data" Origin and Evolution of Interplanetary Dust.

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Mukai(eds.K.Nakazawa,et al.): "“Primitive Solar Nebula and Origin of the Planets"Chapt.6.5.Cometary Dust" Kluwer Academic Publ.,

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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