Amorphous ice and the behavior of cometary nuclei

Details Amorphous ice and the behavior of cometary nuclei Amorphous ice and the behavior of cometary nuclei

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l..31s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Feb. 15, 1981, p. L31-L34.

Astronomy and Astrophysics

Astrophysics

80

Amorphous Materials, Astrophysics, Comet Nuclei, Ice, Surface Temperature, Temperature Profiles, Water, Comets, Nuclei, Ice, Water, Structure, Crystallization, Comet Tails, Flares, Inclination, Rotation, Porosity, P/Schwassmann-Wachmann 1, Phases, Temperatures, Heating

Scientific paper

The gradual heating of the nucleus of a comet approaching the sun may produce solid-state phase changes that are of particular importance for new comets, which may never have been heated before. The water-ice component of new comets is expected to be amorphous rather than crystalline, and its subsequent crystallization should produce gaseous tails and flareups at heliocentric distances about 70% greater than those expected for crystalline nuclei. These distances and the size of the flareups depend strongly on the inclination of the rotation axis and on the porosity of the ice. The effect should be weaker for older comets, but it may be related to the behavior of P/Schwassmann-Wachmann 1 if the layers of the crystallized ice peel off.

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