CO2 depth profiles in cometary model substances of KOSI

Details CO2 depth profiles in cometary model substances of KOSI CO2 depth profiles in cometary model substances of KOSI

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302..191h&link_type=abstract

In ESA, Physics and Mechanics of Cometary Materials p 191-196 (SEE N90-19989 12-90)

Physics

Analogs, Carbon Dioxide Concentration, Comets, Depth Measurement, Simulation, Thermochromatic Materials, Core Sampling, Depletion, Diffusion, European Space Programs, Volatility

Scientific paper

The CO2 content of cometary analogs used in the KOSI 3 and 4 (comet simulation) experiments was measured by gas chromatography. CO2 depth profiles were determined after insolation in cm layers taken from the samples which originally contained 14 to 15 percent frozen CO2 which show an upper layer completely depleted of the volatile component, while the deeper layers are not affected. A transition layer where the CO2 content ranges from 0 percent to a value which is higher than that of the starting (greater than 20 percent) is interpreted as inward diffusion of CO2 which can recondense in colder zones. Correlation with the temperature profiles was observed. The upper and lower layers show a rather constant but different temperature, while a very steep temperature gradient is found in the transition layer. The water-ice profile showed no significant change with respect to the starting material. Inward diffusion and correlated thermal effects are concluded to be governed by the lighter volatiles (here CO2) and less by water. Sharp enrichment zones may be found in comets for various substances at different depths, depending on their volatility (thermochromatography).

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