Distributed Sources in Comets
Distributed Sources in Comets
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彗星中的分布式源
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
N. Fray
中科院分区：
文献类型：
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作者：
H. Cottin;N. Fray
一些分子和自由基（H2CO、CO、HNC、CN等）在几颗彗星大气中的分布，不能仅仅用从彗核直接升华或彗发中的气相过程来解释。这些分子部分是彗发中分布源的结果，可能是尘埃的光降解和热降解。我们提出了一个审查的降解过程，并讨论可能的解释的意见，其中固体复杂的有机材料在尘埃颗粒的降解似乎发挥了重要作用。对这种气体产生机制的了解为彗星核中所含难熔有机物质的化学性质提供了重要线索。
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.