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

@article{McKay2019DetectionOA,
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},
year={2019}
}
• A. McKay, +1 author M. DiSanti
• Published 28 October 2019
• Physics
• 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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## References

SHOWING 1-10 OF 33 REFERENCES
Detection of CN Gas in Interstellar Object 2I/Borisov
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
2I/Borisov: A C2-depleted interstellar comet
Aims. The discovery of the first active interstellar object 2I/Borisov provides an unprecedented opportunity to study planetary formation processes in another planetary system. In particular,
Initial Characterization of Interstellar Comet 2I/2019 Q4 (Borisov)
• Physics
• 2019
We present initial observations of the interstellar body 2I/(2019 Q4) Borisov taken to determine its nature prior to the perihelion in 2019 December. Images from the Nordic Optical Telescope show a
THE EXTREMELY ANOMALOUS MOLECULAR ABUNDANCES OF COMET 96P/MACHHOLZ 1 FROM NARROWBAND PHOTOMETRY
Narrowband-filter photometry of Comet 96P/Machholz 1 was obtained at Lowell Observatory during the comet's 2007 apparition. Production rates of OH, CN, C2, C3, and NH were derived from these data
The Nucleus of Interstellar Comet 2I/Borisov
• Physics
• 2019
We present high resolution imaging observations of interstellar comet 2I/Borisov (formerly C/2019 Q4) obtained using the Hubble Space Telescope. Scattering from the comet is dominated by a coma of
The Peculiar Volatile Composition of CO-dominated Comet C/2016 R2 (PanSTARRS)
Comet C/2016 R2 (PanSTARRS) has a peculiar volatile composition, with CO being the dominant volatile as opposed to H$_2$O and one of the largest N$_2$/CO ratios ever observed in a comet. Using
The Evolving Activity of the Dynamically Young Comet C/2009 P1 (Garradd)
We used the Ultraviolet-Optical Telescope on board Swift to observe the dynamically young comet C/2009 P1 (Garradd) from a heliocentric distance of 3.5 AU pre-perihelion until 4.0 AU outbound. At 3.5
Carbon Chain Depletion of 2I/Borisov
The composition of comets in the solar system come in multiple groups thought to encode information about their formation in different regions o fthe outer protosolar disk. The recent discovery of
Observational Constraints on the Lifetime of Cometary H2O
• Physics
• 1993
Abstract We used a carefully selected set of observations of five comets along with a vectorial model and the Haser model to explore the lifetimes against photodissociation of H 2 O and OH in
Terrestrial deuterium-to-hydrogen ratio in water in hyperactive comets
The D/H ratio in cometary water has been shown to vary between 1 and 3 times the Earth’s oceans value, in both Oort cloud comets and Jupiter-family comets originating from the Kuiper belt. This has