Formation environment of cometary nuclei in the primordial solar nebula

Details Formation environment of cometary nuclei in the primordial solar nebula Formation environment of cometary nuclei in the primordial solar nebula

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142...31y&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 1, Jan. 1985, p. 31-36.

Astronomy and Astrophysics

Astrophysics

51

Comet Nuclei, Evolution (Development), Solar Corona, Chemical Composition, Grains, Ice, Molecular Gases, Sublimation, Comets, Formation, Environment, Comet Nuclei, Solar Nebula, Chemistry, Composition, Ice, Sublimation, Condensation, Temperature, Calculations, Grains, Origin

Scientific paper

The formation environment of comets in the primordial solar nebula is investigated from the point of view of the chemical composition of the ices of cometary nuclei. A sublimation sequence for various species of possible constituents of the nuclear ice, which would have condensed on the grain surface in the parent interstellar cloud was obtained by calculating the temperature of grains in the solar nebula. On this basis, an allowed range of the nebular temperature in the formation region of cometary nuclei is obtained from a condition for retention of the ices of the nuclear composition. Combining this result with models of the solar nebula, the region for the formation of cometary nuclei in the solar nebula is discussed. It is shown that cometary nuclei formed at least beyond the region between the formation regions of Saturn and Uranus. Finally, an upper limit is estimated for the grain temperature in the region of comet formation at an earlier stage of the solar nebula. The grain temperature is shown to be less than 60 K at this stage.

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