Gas and Heat Diffusion in Cometary Nuclei

Details Gas and Heat Diffusion in Cometary Nuclei Gas and Heat Diffusion in Cometary Nuclei

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.3827c&link_type=abstract

American Astronomical Society, DPS meeting #35, #38.27; Bulletin of the American Astronomical Society, Vol. 35, p.1487

Astronomy and Astrophysics

Astronomy

Scientific paper

It is well established that in addition to direct sublimation from the nuclear surface, many of the molecules present in cometary comae originate from sublimation fronts located below the surface. Therefore, the molecular abundance ratios in the coma depend not only on the ratios within the nuclear ices, but also on the physical properties of those ices, and on the thermal structure of the interior of the comet. We present the results of a model of the heat and gas transport in a porous ice/dust mixture. We consider ices of H2O, CO, CO2, and CH3OH, and investigate how the relative outgassing rates depend on the thermal properties of the nucleus, and on the nature of the ice phase in which each species is present. From comparison with observations of the long-term evolution of comet Hale-Bopp we assess the implications for the nature of the CO, CO2, and CH3OH ices in this comet.
This research was supported by NASA's Planetary Atmospheres Program.

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