Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sosyr..33..319i&link_type=abstract
Solar System Research, Vol. 33, No. 4, p. 319 - 323
Physics
1
Cometary Nuclei: Minor Planets, Cometary Nuclei: Evolution, Cometary Nuclei: Evolution
Scientific paper
A dependence of the rate of the decrease of secular brightness on perihelion distance, established previously from observations for short-period comets, clearly points to the progressive growth of a refractory mantle on the nucleus surface. Results of laboratory simulation of a cometary nucleus show that, if the insolation energy is constant, the mantle thickness is proportional to the square root of the insolation duration, the sublimation rate grows linearly with mantle thickness, the temperature of ice under the mantle depends very weakly on the mantle thickness, and the temperature distribution over depth is nearly linear within the mantle. Experimental data on the porosity, density, strength, and thermal conductivity of the simulated mantle are used to numerically simulate the refractory mantle formation on the nuclei of short-period comets. Quantitative data and relationships are obtained, which characterize the time scale of nucleus evolution into an asteroid-like body.
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