Physics
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993kyome..55..171y&link_type=abstract
Memoirs of the Faculty of Engineering, Kyoto University, vol. 55, p. 171
Physics
1
Research, Nitrogen, Carbon Monoxide, Gas Transport, Molecules, Comet Nuclei, Distance, Heat Sources, Numerical Stability, Porosity, Schwassmann-Wachmann Comet, Sublimation
Scientific paper
Investigation is made of the transport of volatile molecules such as N2 or CO through cometary nuclei as they are heated by radio-active elements. Coupled equations of heat and gas transport in the presence of gas sublimation and recondensation as well as heat source are numerically solved. For the sake of numerical stability, it is necessary to take a small value for the effective surface area where sublimation and condensation take place. It is shown that the super-volatiles such as N2 or CO are transported through the pores of the nucleus and consequently, the volatile molecules become more abundant near the surface than deep inside the nucleus. Such a modification of structure is expected to have observational consequences on activities at large heliocentric distances of comets such as P/Schwassmann-Wachmann 1 and Bowell.
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