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N+2 and CO+ in Comets 122P/1995 S1 (deVico) and C/1995 O1 (Hale–Bopp)

✍ Scribed by Anita L. Cochran; William D. Cochran; Edwin S. Barker

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
153 KB
Volume
146
Category
Article
ISSN
0019-1035

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✦ Synopsis

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 the 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.

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