Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusm.p31c..02g&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #P31C-02
Other
6008 Composition (1060), 6020 Ices, 6055 Surfaces, 6200 Planetary Sciences: Solar System Objects, 6207 Comparative Planetology
Scientific paper
With the discovery of each additional small icy planet in the outer Solar System, opportunities for comparative planetology expand. This talk will focus on the surfaces of these bodies, investigating what recent observational data have to say about their compositions and the processes which act on them. Visible and infrared reflectance spectroscopy offers an especially valuable probe of surface compositions, textures, and thermal states and will thus be the primary focus of this talk, although other observational constraints will also be mentioned. It is useful to compare objects within broad compositional classes. One such class consists of worlds having surface veneers of CH4 and other volatile ices which evolve on seasonal time scales and are unstable to photolytic and radiolytic degradation. Another has surfaces composed of nearly pure, crystalline H2O ice, at temperatures cold enough that amorphous ice might be expected to be the dominant phase. Still others have surfaces apparently composed of dark, inert, organic and silicate materials. Differences and similarities between members of these compositional classes offer clues to their origins and to the processes which modify their surfaces.
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