Detection of CN Gas in Interstellar Object 2I/Borisov
Detection of CN Gas in Interstellar Object 2I/Borisov
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DOI：
10.3847/2041-8213/ab49fc
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发表时间：
2019-11-01
影响因子：
7.9
通讯作者：
Snodgrass, Colin
中科院分区：
文献类型：
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作者：
Fitzsimmons, Alan;Hainaut, Olivier;Snodgrass, Colin
探测穿过太阳系的星际物体有希望限制其他太阳系外系统行星形成所涉及的物理和化学过程。1I/2017 U1（？）Oumuamua）进行了动态观察，没有直接检测到喷出的物质。活跃星际彗星2 I/鲍里索夫的发现意味着对该天体的升华冰进行光谱研究是可能的。我们报告了2019年9月20日在日心距离r=2.7 Au处通过2 I/Borisov的CN近紫外发射首次探测到星际彗星发射的气体。测得其产率为Q（CN）=（3.70.4）10（24）s（？）1），使用一个简单的Haser模型与流出速度为0.5公里秒（？1）。没有其他排放被检测到，上限的生产率的C-2的410（24）秒（？1）。尘埃彗发的光谱反射率斜率超过3900？< ?
The detection of interstellar objects passing through the solar system offers the promise of constraining the physical and chemical processes involved in planetary formation in other extrasolar systems. While the effect of outgassing by 1I/2017 U1 (?Oumuamua) was dynamically observed, no direct detection of the ejected material was made. The discovery of the active interstellar comet 2I/Borisov means spectroscopic investigations of the sublimated ices is possible for this object. We report the first detection of gas emitted by an interstellar comet via the near-UV emission of CN from 2I/Borisov at a heliocentric distance of r=2.7 au on 2019 September 20. The production rate was found to be Q(CN)=(3.70.4)10(24) s(?1), using a simple Haser model with an outflow velocity of 0.5 km s(?1). No other emission was detected, with an upper limit to the production rate of C-2 of 410(24) s(?1). The spectral reflectance slope of the dust coma over 3900 ? < ?