Laboratory studies of cometary ice analogues

Details Laboratory studies of cometary ice analogues Laboratory studies of cometary ice analogues

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302...65s&link_type=abstract

In ESA, Physics and Mechanics of Cometary Materials p 65-69 (SEE N90-19989 12-90)

Physics

62

Analogs, Comet Nuclei, Comets, Evolution (Development), Ice, Physical Chemistry, Surface Properties, Temperature Effects, Behavior, Clathrates, Hydrates, Test Facilities

Scientific paper

Laboratory studies were performed in order to simulate the physico-chemical processes that are likely to occur in the near surface layers of short and intermediate period comets. Pure H2O ice as well as CO:H2O, CO2:H2O, CH4:H2O, CO:CO2:H2O, and NH3:H2O ice mixtures were studied in the temperature range between 10 and 180 K. The evolution of the composition of ice mixtures, the crystallization of H2O ice as well as the formation and decompostion of clathrate hydrate by different processes were studied as a function of temperature and time. Using the results together with numerical modeling, predictions are made about the survival of amorphous ice, CO, CO2, CH4, and NH3 in the near surface layers of short period comets. The likeliness of finding clathrate and molecular hydrates is discussed. It is proposed that the analytical methods developed here could be fruitfully adapted to the analysis of returned comet samples.

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