Other
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...69...83t&link_type=abstract
Icarus (ISSN 0019-1035), vol. 69, Jan. 1987, p. 83-90.
Other
25
Comet Nuclei, Thermal Stresses, Crack Initiation, Ice, Inclusions, Surface Temperature, Viscoelasticity, Water, Comets, Comet Nuclei, Thermal Properties, Stress, Temperature, Surface, Cores, Thermal Effects, Calculations, Icy Bodies, Inclusions, Water Ice, Viscoelasticity, Splitting, Jetting, Homogeneity, Diagrams, Halley, Vapor Pressure, Outgassing, Fracturing
Scientific paper
The effects of thermal stress on the evolution of comets are explored analytically in an elastic approximation. The total stresses undergone by the comet are modeled in terms of a linear expansion of the comet. Ice creep is accounted for with a viscoelastic treatment. The icy cometesimals and surrounding inclusions of other materials which are the principal components of a comet undergo thermal stresses which surpass the strength of water ice near the surface when the nucleus is over 10 m in diam. Cracking at the surface exposes new material, causing surface evaporation and ejection of up to one trillion grams of material from one outburst from a 60 m diam comet.
Kührt Ekkehard
Tauber F.
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