A Mechanism of Crystallization of Cometary Silicates

Details A Mechanism of Crystallization of Cometary Silicates A Mechanism of Crystallization of Cometary Silicates

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..522y&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

7

Scientific paper

We propose a mechanism of crystallization of cometary silicate grains on the basis of the Greenberg model of cometary dust which is composed of a silicate core an organic mantle and an outermost icy mantle. The crystallization mechanism we propose is due to energy release by polymerization of the organic mantle when the grains are released from a cometary nucleus and heated by solar radiation. We formulate the crystallization mechanism and calculate the degree of crystallization of the silicate core. We show the results of the calculations of the crystallization degree for plausible values of the physical parameters and of the infrared emission spectra.

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