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arXiv:astro-ph/0003122 (astro-ph)
[Submitted on 8 Mar 2000]

Title:N$_2^+$ and CO$^+$ in Comets 122P/1995 S1 (deVico) and C/1995 O1 (Hale-Bopp)

Authors:Anita L. Cochran, William D. Cochran, Edwin S. Barker
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Abstract: We observed comets 122P/1995\,S1 (deVico) and C/1995\,O1 (Hale-Bopp) with high spectral resolving power in order to determine the ratio of N$_2^+$/CO$^+$ in their comae. While we clearly detected the CO$^+$ in both of these comets, no N$_2^+$ was detected in either comet. From these spectra, we derive sensitive upper limits for N$_2^+$/CO$^+$. These upper limits are substantially below other reported detections of N$_2^+$/CO$^+$ in other comets. We discuss the prior N$_2^+$ detections and compare them with our observations. The abundance of N$_2$ in comets is important to our understanding of the condensation of ices in the solar nebula. In addition, N$_2$ is a tracer of Ar so study of N$_2$ allows an understanding of the role of comets for delivering volatiles to the terrestrial planets. It appears that many, if not most, comets are depleted in N$_2$ and it will be necessary to search for a mechanism for depleting this molecule in order to be consistent with current models of the solar nebula.
Comments: 25 pages, 3 tables, 7 figures, accepted for publication in Icarus
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0003122
  (or arXiv:astro-ph/0003122v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0003122
Related DOI: https://doi.org/10.1006/icar.2000.6413

Submission history

From: Anita L. Cochran [view email]
[v1] Wed, 8 Mar 2000 23:52:22 UTC (103 KB)
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