The composition of dust in Jupiter-family comets inferred from infrared spectroscopy
作者： Michael S. Kelley , Diane H. Wooden
DOI: 10.1016/J.PSS.2008.11.017
关键词: Comet 、 Physics 、 Infrared spectroscopy 、 Comet dust 、 Spectroscopy 、 Spitzer Space Telescope 、 Silicate 、 Astrophysics 、 Formation and evolution of the Solar System 、 Astrobiology 、 Comet nucleus
摘要: Abstract We review the composition of Jupiter-family comet (JFC) dust as inferred from infrared spectroscopy. find that JFCs have 10 μ m silicate emission features with fluxes roughly 20–25% over continuum (emission strength 1.20–1.25), similar to weakest in Oort Cloud (OC) comets. discuss grain properties alter feature (composition, size, and structure/shape), emphasize thermal nucleus can significant influence on derived strength. Recent evidence suggests porosity is different between OC comets, but more observations models silicates are needed determine if a consistent set parameters explain their weak features. Models 8 m telescope Spitzer Space Telescope shown crystalline abundances or less than those found although mineralogy comets 9P/Tempel C/1995 O1 (Hale-Bopp) differ each other Mg Fe content. The heterogeneity nuclei also be assessed mid-infrared spectroscopy, we for heterogeneous 9P/Tempel. formation, mixing solar nebula, formation must able observed range content 9P/Tempel, work order understand what extent do Hale-Bopp represent whole.
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