Morphological Structure and Chemical Composition of Cometary Nuclei and Dust |
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Authors: | Greenberg J Mayo Li Aigen |
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Abstract: | The chemical composition of comet nuclei derived from current data on interstellar dust ingredients and comet dust and coma
molecules are shown to be substantially consistent with each other in both refractory and volatile components. When limited
by relative cosmic abundances the water in comet nuclei is constrained to be close to 30% by mass and the refractory to volatile
ratio is close to 1:1. The morphological structure of comet nuclei, as deduced from comet dust infrared continuum and spectral
emission properties, is described by a fluffy (porous) aggregate of tenth micron silicate core-organic refractory mantle particle
on which outer mantles of predominantly H2O ices contain embedded carbonaceous and polycyclic aromatic hydrocarbon (PAH) type particles of size in the of 1 - 10nm range.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | ISM: dust ISM: molecules ISM: abundances Comets: general Comets: individual: Halley Borrelly Hale-Bopp Stars: individual: β Pictoris Stars: circumstellar matter Stars: planetary systems |
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