Implications of Ice Morphology for Comet Formation

Details Implications of Ice Morphology for Comet Formation Implications of Ice Morphology for Comet Formation

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..491c&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

1

Scientific paper

Laboratory surface science under ultrahigh vacuum (UHV) conditions allows us to simulate the growth of ices in astrophysical environments. Using the techniques of temperature programmed desorption (TPD) reflection-absorption infrared spectroscopy (RAIRS) and microbalance methods we have studied binary ice systems consisting of water (H2O) and variety of other species including carbon monoxide (CO) and carbon dioxide (CO2) at astrophysically relevant conditions of temperature and pressure. We present results that demonstrate that the morphology of water ice has an important influence on the behaviour of such systems by allowing processes such as diffusion and trapping that can not be understood through a knowledge of the binding energies of the species alone. Through an understanding of the implications of water ice morphology on the behaviour of ice mixtures in the interstellar environment additional constraints can be placed on the thermodynamic conditions and ice compositions during comet formation.

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