Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..613s&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 613-619 (SEE N88-21884 14-91)
Physics
7
Comet Nuclei, Gas Evolution, Gas-Solid Interactions, Ice, Clathrates, Crystal Structure, Temperature Gradients
Scientific paper
The hypothesis that the large variability of the CO productions compared to the fairly constant CN/H2O, C2/CN and C3/CN ratios has its origin in the evolution processes of the nucleus was tested by simulating physical processes that may occur inside a comet nucleus. Results on the structure and dynamics of amorphous ice and on the formation and decomposition of clathrate hydrate are summarized. The physical evolutions that a comet nucleus could experience when subjected to a temperature gradient are outlined. From the analysis of this evolution scheme, conclusions on the chemical differentiation of the nucleus and on the production rates of the parent molecules released at the surface are presented. It is concluded that the large variability of CO and CO2 production rates between comets cannot be directly assigned to differences in initial composition.
Klinger Jurgen
Schmitt Bernard
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