Crystalline Ices in Protoplanetary Disks

Details Crystalline Ices in Protoplanetary Disks Crystalline Ices in Protoplanetary Disks

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915604h&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #156.04; Bulletin of the American Astronomical Society, Vol. 34, p.563

Astronomy and Astrophysics

Astronomy

Scientific paper

Water ice mantles trap more volatile molecules, with an efficiency that depends on the amorphous or crystalline structure of the ice. This property will affect the composition of comets forming from the mantles. We find that the processing of mantled grains in protoplanetary disks due to passage through shock waves will determine the crystalline structure. Specifically, the grains suffer a sudden increase in temperature which can evaporate the mantle. This is followed by an extended cooling time during which mantles recondense on timescales comparable to the crystallization time scale. The crystallization of ice and the exclusion of volatiles from the matrix may explain the volatile-depleted composition observed recently in Comet C/1999 S4 (LINEAR). This work was supported by NASA under grant NAG5-7598 to the New York Center for Studies on the Origins of Life.

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