论文标题
星际彗星2i/borisov，如缪斯：C $ _2 $，NH $ _2 $和红色CN检测
Interstellar comet 2I/Borisov as seen by MUSE: C$_2$, NH$_2$ and red CN detections
论文作者
论文摘要
我们报告了C $ _2 $和大量NH $ _2 $的清晰检测，在第一个显着的星际彗星2i/borisov中。我们在2019年11月的三个晚上观察到2i的光波长4800--9300ÅÅwith在ESO/非常大的望远镜上的多单元光谱探索器（MUSE）积分光谱仪。这些数据，以及从两种0.6 m trappist望远镜的时间上观察到的观察结果都对2i昏迷中气体物种的生产率构成了限制。 From the MUSE detection on all epochs of several bands of the optical emission of the C$_2$ Swan system, a rich emission spectrum of NH$_2$ with many highly visible bands, and the red (1-0) bandhead of CN, together with violet CN detections by TRAPPIST, we infer production rates of $Q$(C$_2$) = $1.1\times10^{24}$ mol s $^{ - 1} $，$ q $（nh $ _2 $）= $ 4.8 \ times10^{24} $ mol s $ s $^{ - 1} $和$ q $（cn）= $（1.8 \ pm0.2）\ times 10^{24} $ s $ s $ s $ s $^{ - 1} $。在11月下旬为2.03〜AU，2i的生产率为c $ _2 $ _2 $/cn $ = 0.61 $，仅碳链几乎没有耗尽，而与早期的报告相反，从强碳链耗尽的太阳中进一步测得。因此，2i在其C $ _2 $生产率上显示了进化：父分子储层已经开始升华。在$ q $（NH $ _2 $）/$ Q $（CN）= 2.7时，第二个星际对象相对于已知的太阳系样本，以NH $ _2 $富含NH $ _2 $。
We report the clear detection of C$_2$ and of abundant NH$_2$ in the first prominently active interstellar comet, 2I/Borisov. We observed 2I on three nights in November 2019 at optical wavelengths 4800--9300 Åwith the Multi-Unit Spectroscopic Explorer (MUSE) integral-field spectrograph on the ESO/Very Large Telescope. These data, together with observations close in time from both 0.6-m TRAPPIST telescopes, provide constraints on the production rates of species of gas in 2I's coma. From the MUSE detection on all epochs of several bands of the optical emission of the C$_2$ Swan system, a rich emission spectrum of NH$_2$ with many highly visible bands, and the red (1-0) bandhead of CN, together with violet CN detections by TRAPPIST, we infer production rates of $Q$(C$_2$) = $1.1\times10^{24}$ mol s$^{-1}$, $Q$(NH$_2$) = $4.8\times10^{24}$ mol s$^{-1}$ and $Q$(CN) = $(1.8\pm0.2)\times 10^{24}$ mol s$^{-1}$. In late November at 2.03~au, 2I had a production ratio of C$_2$/CN$=0.61$, only barely carbon-chain depleted, in contrast to earlier reports measured further from the Sun of strong carbon-chain depletion. Thus, 2I has shown evolution in its C$_2$ production rate: a parent molecule reservoir has started sublimating. At $Q$(NH$_2$)/$Q$(CN) = 2.7, this second interstellar object is enriched in NH$_2$, relative to the known Solar System sample.
