Evolution of Carbonaceous Chondrite Parent Bodies: Insights into Cometary Nuclei?

Details Evolution of Carbonaceous Chondrite Parent Bodies: Insights into Cometary Nuclei? Evolution of Carbonaceous Chondrite Parent Bodies: Insights into Cometary Nuclei?

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arcn.rept..225m&link_type=abstract

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

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Carbonaceous Chondrites, Comet Nuclei, Interplanetary Dust, Comets, Chemical Evolution, Ice, Interstellar Chemistry, Interstellar Space, Halley''S Comet, Asteroids, Protoplanets, Reflectance, Abundance, Debris

Scientific paper

Much of the excitement about obtaining cometary samples accrues from the conventional view that they comprise the most primitive materials that we are likely to get our hands on. But is this true? Although "parent body" alteration of such samples would not necessarily detract from this interest, we should keep in mind the possibility that certain kinds of secondary processes may have affected cometary nuclei. Weissman (1986) has proposed some mechanisms by which comet nuclei might be altered, but observational evidence supporting the physical processing of comets is not yet generally available. This paper will take another approach: inferences about the kinds of modifications that might be encountered can be drawn from data on the evolution of carbonaceous chondrite parent bodies. It seems increasingly unlikely that carbonaceous chondrites are comet nucleus samples. However, these meteorites were probably derived from planetesimals that originally contained ices, though possibly in lesser proportions than comets, so the compositional distinction between carbonaceous chondrite parent bodies and comets may be one of degree. The possibility of an orbital evolution of cometary bodies into asteroidal orbits lias also been suggested. For these reasons, it seems prudent to examine the processes which have affected carbonaceous chondrite parent bodies as possible analogs for the evolutionary history of comets.

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