文章基本信息

标题：New Insights into the Chemical Composition of Five Oort Cloud Comets after Re-analysis of Their Infrared Spectra
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作者：Manuela Lippi ; Geronimo L.Villanueva ; Michael J.Mumma 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：4
页码：2123-2138
DOI：10.3847/1538-3881/ab7206
语种：English
出版社：American Institute of Physics
摘要：We present revised results for the main molecular species in five Oort Cloud comets observed with near-infrared echelle grating spectrometer (NIRSPEC) at the Keck Observatory between 1999 and 2012 (C/1999 S4 (LINEAR), C/2001 A2 (LINEAR), C/2007 W1 (Boattini), C/2012 F6 (Lemmon), and C/2012 S1 (ISON)).The re-evaluation of these data shows the improvement of results in some of the data sets, in particular for comets observed and analyzed before the advent of new and revised fluorescence models and terrestrial retrieval methods introduced since 2011.We observe significant improvements in the resulting rotational temperatures and the production rates for all species, and in mixing ratios of minor species (relative to water).The re-analysis also allowed us to quantify species not analyzed previously, mostly due to the lack of molecular models (e.g., ammonia and formaldehyde).We note, however, that the improvement of these revised values is less substantial for comets observed (and/or analyzed) since 2010.
关键词：Comets;Astrobiology;Solar system formation