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Chemical Composition of Cometary Ice and Grain, and Origin of Comets

Published online by Cambridge University Press:  04 August 2017

Tetsuo Yamamoto
Tetsuo Yamamoto*
Affiliation:
Institute of Space and Astronautical Science, Komaba 4-6-1, Meguro-ku, Tokyo 153, Japan

Abstract

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The chemical composition of the ice and grains in a cometary nucleus is discussed by applying the condensation theory. The equilibrium condensation theory of a gas having the elemental abundances in the solar system is briefly reviewed. The composition of solids predicted by the equilibrium condensation theory is compared with that of the ice and grains in the nucleus; the latter is inferred from the observations of cometary molecules and grains. On the basis of the results of this comparison, a scenario for the formation history of comets is proposed, and discussion is given on the temperature and region of the primordial solar nebula where comets formed.

Type
Grains
Information
Symposium - International Astronomical Union , Volume 120: Astrochemistry , 1987 , pp. 565 - 575
Copyright
Copyright © Reidel 1987 

References

A'Hearn, M.F. and Feldman, P.D.: 1985, ‘S2: A clue to the origin of cometary ice?’, in Ices in the Solar System, ed. Klinger, J., Dollfus, A. and Smoluchowski, R. (D. Reidel), pp. 463–471.Google Scholar
Arpigny, C.: 1978, ‘On the nature of comets’, Proc. R.A. Welch Foundation Conf. Chemical Research XXI. Cosmochemisty, pp. 9–57.Google Scholar
Arpigny, C.: 1979, ‘Relative abundances of the heavy elements in Comet Ikeya-Seki (1965 VIII)’, in Elements and Isotopes in the Universe, 22nd Colloq. Astrophys. Liège (Univ. Liège), pp. 189–197.Google Scholar
Biermann, L., Giguere, P.T., and Huebner, W.F.: 1982, ‘A model of a comet coma with interstellar molecules in the nucleus’, Astron. Astrophys. 108, 221–226.Google Scholar
Cameron, A.G.W.: 1978, ‘Physics of the primitive solar accretion disk’, Moon and Planets 18, 5–40.Google Scholar
Cameron, A.G.W.: 1981, ‘Elemental and nuclidic abundances in the solar system’, in Essays in Nuclear Astrophysics, ed. Barnes, C.A., Clayton, D.D., and Schramm, D.N. (Cambridge Univ. Press), pp. 23–43.Google Scholar
Delsemme, A.H.: 1978, ‘The pristine nature of comets’, in Comets, Asteroids, Meteorites - interrelations, evolution and origins, ed. Delsemme, A.H. (Univ. Toledo), pp. 3–13.Google Scholar
Delsemme, A.H.: 1982, ‘Chemical composition of cometary nuclei’, in COMETS, ed. Wilkening, L.L. (Univ. Arizona Press), pp. 323–340.Google Scholar
Donn, B.: 1981, ‘Comet nucleus: Some characteristics and a hypothesis on origin and structure’, in Comets and the Origin of Life, ed. Ponnamperuma, C. (D. Reidel), pp. 21–29.CrossRefGoogle Scholar
Feldmann, P.D.: 1983, ‘Ultraviolet spectroscopy and the composition of cometary ice’, Science 219, 347–354.Google Scholar
Feldman, P.D.: 1985, ‘Carbon monoxide in cometary ice’, to be published in Asteroids, Comets, Meteors II, ed. Lagerkvist, C.-I., Magnusson, P. and Rickman, H. (Uppsala Uviv.).Google Scholar
Giguere, P.T. and Huebner, W.F.: 1978, ‘A model of comet comae: Gasphase chemistry in one dimension’, Astrophys. J. 223, 638–654.Google Scholar
Gilman, R.C.: 1969, ‘On the composition of circumstellar grains’, Astrophys. J. 155, L185–L187.CrossRefGoogle Scholar
Goldreich, P. and Ward, W. R.: 1973, ‘The formation of planetesimals’, Astrophys. J. 183, 1051–1061.Google Scholar
Greenberg, J.M.: 1982, ‘What are comets made of? A model based on interstellar dust’, in COMETS, ed. Wilkening, L.L. (Univ. Arizona Press), pp. 131–163.Google Scholar
Greenberg, J.M.: 1983, ‘Laboratory dust experiments - Tracing the composition of cometary dust’, in Cometary Exploration II (Proc. Int. Conf. Cometary Exploration, Budapest), ed. Gombosi, T.I., pp. 23–54.Google Scholar
Greenberg, J.M.: 1985, ‘Laboratory simulation of the formation of S2 in interstellar dust - the implications for the maximum aggregation temperature of a comet’, to be published in Asteroids, Comets, Meteors II, ed. Lagerkvist, C.-I., Magnusson, P. and Rickman, H. (Uppsala Univ.).Google Scholar
Greenberg, J.M. and d'Hendecourt, L.B.: 1985, ‘Evolution of ices from interstellar space to the solar system’, in Ices in the Solar System, ed. Klinger, J., Dollfus, A. and Smoluchowski, R. (D. Reidel), pp. 185–204.Google Scholar
Grossman, L. and Larimer, J.W.: 1974, ‘Early chemical history of the solar system’, Rev. Geophys. Space Phys. 42, 71–101.Google Scholar
Hashimoto, A.: 1983, ‘Evaporation metamorphism in the early solar nebula - evaporation experiments on the melt FeO-MgO-SiO2-CaO-Al2O3 and chemical fractionation of primitive materials’, Geochem. J. 17, 111–145.Google Scholar
Hayashi, C.: 1972, ‘A theory of formation of the solar system’, in Proc. Lunar and Planetary Symp., ed. Takayanagi, K. and Shimizu, M. (Inst. Space Aeronautical Sci., Univ. Tokyo), pp. 13–18 (in Japanese).Google Scholar
Hayashi, C.: 1981, ‘Structure of the solar nebula, growth and decay of magnetic fields and effect of magnetic and turbulent viscosities on the nebula’, Suppl. Prog. Theor. Phys. No. 70, 35–53.Google Scholar
Huebner, W.F. and Giguere, P.T.: 1980, ‘A model of comet comae. II. Effect of solar photodissociation and ionization’, Astrophys. J. 238, 753–762.CrossRefGoogle Scholar
Lewis, J.S.: 1974, ‘The temperature gradient in the solar nebula’, Science 186, 440–443.Google Scholar
Mitchell, G.F., Prasad, S.S. and Huntress, W.T.: 1981, ‘Chemical model calculations of C2, C3, CH, CN, OH and NH2 abundances in cometary comae’, Astrophys. J. 244, 1087–1093.Google Scholar
Morton, D.: 1974, ‘Interstellar abundances toward Zeta Ophiuchi’, Astrophys. J. 193, L35–L39.CrossRefGoogle Scholar
Nakano, T.: 1985, ‘Formation of planets around stars of various masses. I. Formulation and a star of one solar mass’, Preprint (KUNS 804, Dept. Phys., Kyoto Univ.).Google Scholar
Ney, E.P.: 1982, ‘Optical and infrared observations of bright comets in the range 0.5 μm to 20 μm’, in COMETS, ed. Wilkening, L.L. (Univ. Arizona Press), pp. 323–340.Google Scholar
Rose, L.A.: 1979, ‘Laboratory simulation of infrared astrophysical features’, Astrophys. Space Sci. 65, 47–67.CrossRefGoogle Scholar
Safronov, V.S.: 1972, Evolution of the protoplanetary cloud and formation of the earth and the planets (Israel Program for Scientific Translations, Jerusalem), Chap. 5.Google Scholar
Salpeter, E.E.: 1977, ‘Formation and destruction of dust grains’, Ann. Rev. Astron. Astrophys. 15, 267–293.CrossRefGoogle Scholar
Swift, M.B. and Mitchell, G.F.: 1981, ‘Models of the cometary coma in which abundances are calculated for various heliocentric distances’, Icarus 47, 412–430.CrossRefGoogle Scholar
Weissman, P.R.: 1985a, ‘The Oort cloud and the Galaxy: Dynamical interactions’, Preprint (JPL Cometary Science Team, No. 71), to be published in The Galaxy and The Solar System.Google Scholar
Weissman, P.R.: 1985b, ‘The Oort cloud in transition’, Preprint (JPL Cometary Science Team, No. 73), to be published in Asteroids, Comets, and Meteors II., ed. Lagerkvist, C.-I., Magnusson, P. and Rickman, H. (Uppsala Uviv.).Google Scholar
Yamamoto, T.: 1985a, ‘Formation environment of cometary nuclei in the primordial solar nebula’, Astron. Astrophys. 142, 31–36.Google Scholar
Yamamoto, T.: 1985b, “Formation history and environment of cometary nuclei”, in Ices in the Solar System, ed. Klinger, J., Dollfus, A. and Smoluchowski, R. (D. Reidel), pp. 205–219.Google Scholar
Yamamoto, T., Nakagawa, N. and Fukui, Y.: 1983, ‘The chemical composition and thermal history of the ice of a cometary nucleus’, Astron. Astrophys. 122, 171–176.Google Scholar