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标题：Isotopic ratios in outbursting comet C/2015 ER61
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作者：Damien Hutsemékers ; Yoshiharu Shinnaka ; Cyrielle Opitom 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：609
DOI：10.1051/0004-6361/201732100
语种：English
出版社：EDP Sciences
摘要：Isotopic ratios in comets are critical to understanding the origin of cometary material and the physical and chemical conditions in the early solar nebula. Comet C/2015 ER61 (PANSTARRS) underwent an outburst with a total brightness increase of 2 magnitudes on the night of 2017 April 4. The sharp increase in brightness offered a rare opportunity to measure the isotopic ratios of the light elements in the coma of this comet. We obtained two high-resolution spectra of C/2015 ER61 with UVES/VLT on the nights of 2017 April 13 and 17. At the time of our observations, the comet was fading gradually following the outburst. We measured the nitrogen and carbon isotopic ratios from the CN violet (0, 0) band and found that12C/13C = 100 ± 15,14N/15N = 130 ± 15. In addition, we determined the14N/15N ratio from four pairs of NH2isotopolog lines and measured14N/15N = 140 ± 28. The measured isotopic ratios of C/2015 ER61 do not deviate significantly from those of other comets.
关键词：Keywordsencomets: generalcomets: individual: C/2015 ER61 (PANSTARRS)methods: observational