Modification of Comet Materials by the Sublimation Process: Results from Simulation Experiments

Details Modification of Comet Materials by the Sublimation Process: Results from Simulation Experiments Modification of Comet Materials by the Sublimation Process: Results from Simulation Experiments

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arcn.rept..315g&link_type=abstract

Analysis of Returned Comet Nucleus Samples, Proceedings of a Workshop held at Milpitas, California, 16-18 January, 1989. Compil

Computer Science

Comets, Simulation, Ice, Minerals, Fractionation, Galactic Structure, Water, Refractories, Spectral Reflectance, Sublimation, Surface Layers, Thickness, Volatility, Porosity, Dust, Surface Properties, Composition (Property)

Scientific paper

Sublimation experiments with Ice-mineral mixtures were carried out at the DLR Space Simulator in order to study cometary processes. First experiments were done with cylindrical samples of 30 cm diameter and iS an thickness which consisted of water-ice or water- and CO2-ice mineral mixtures. These experiments have already yielded important and new insights into the modifications of the sample which are caused by the sublimation of the ices due to insolation: (1) Spectral reflectance measurements show the reduction of volatile materials in the surface layers of the sample and the formation of a permeable refractory dust mantle, (2) the dust mantle as well as the residuals of emitted dust particles have a low density (approx. 0.1 g/cu cm) aggregate structure, (3) metamorphosis of the original non-coherent ice into hard but still porous water ice has been observed under the dust mantle, and (4) fractionation of ices of different volatility occurs during their sublimation. A qualitative model is described which can explain the observed modifications of the sample material.

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