Detection of a Water Tracer in Interstellar Comet 2I/Borisov

  title={Detection of a Water Tracer in Interstellar Comet 2I/Borisov},
  author={Adam J. McKay and Anita L. Cochran and Neil Dello Russo and Michael A. DiSanti},
  journal={arXiv: Earth and Planetary Astrophysics},
We present high spectral resolution optical spectra obtained with the ARCES instrument at Apache Point Observatory showing detection of the [OI]6300 A line in interstellar comet 2I/Borisov. We employ the observed flux in this line to derive an H$_2$O production rate of (6.3$\pm$1.5)$\times$10$^{26}$ mol s$^{-1}$. Comparing to previously reported observations of CN, this implies a CN/H$_2$O ratio of $\sim$0.3-0.6%. The lower end of this range is consistent with the average value in comets, while… 

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