Distributed Sources in Comets |
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Authors: | Hervé Cottin Nicolas Fray |
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Institution: | 1. Laboratoire Interuniversitaire des Systèmes Atmosphériques, Universités Paris 12 et Paris 7, UMR CNRS 7583, 61 Av. du Général de Gaulle, Créteil, 94010, France
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Abstract: | The distribution of some molecules and radicals (H2CO, CO, HNC, CN,?…) in the atmosphere of several comets cannot be explained only by a direct sublimation from the nucleus, or by gas phase processes in the coma. Such molecules are in part the result of a distributed source in the coma, which could be the photo and thermal degradation of dust. We present a review of the degradation processes and discuss possible interpretations of the observations in which the degradation of solid complex organic material in dust particles seems to play a major role. The knowledge of such gas production mechanisms provides important clues on the chemical nature of the refractory organic material contained in comet nuclei. |
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