2I/Borisov: A C2-depleted interstellar comet

  title={2I/Borisov: A C2-depleted interstellar comet},
  author={Cyrielle Opitom and Alan Fitzsimmons and Emmanuel Jehin and Youssef Moulane and Olivier R. Hainaut and Karen J. Meech and B. Yang and Colin Snodgrass and Marco Micheli and Jacqueline V. Keane and Zouhair Benkhaldoun and Jan T. Kleyna},
  journal={Astronomy \& Astrophysics},
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, spectroscopic observations of 2I allow us to constrain the composition of its nuclear ices. Methods. We obtained optical spectra of 2I with the 4.2 m William Herschel and 2.5 m Isaac Newton telescopes between 2019 September 30 and October 13, when the comet was between 2.5 au and 2.4 au from the Sun. We… 

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