The Composition of Ices in Comet C/1995 O1 (Hale-Bopp): Upper Limits on Undetected Species from Radio Spectroscopy.

Details The Composition of Ices in Comet C/1995 O1 (Hale-Bopp): Upper Limits on Undetected Species from Radio Spectroscopy. The Composition of Ices in Comet C/1995 O1 (Hale-Bopp): Upper Limits on Undetected Species from Radio Spectroscopy.

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.3202c&link_type=abstract

American Astronomical Society, DPS meeting #31, #32.02

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From radio spectroscopic observations of comets, more than 22 molecules, radicals and ions, plus several isotopic varieties, were detected (the majority of them being recently revealed in comets C/1996 B2 Hyakutake and C/1995 O1 Hale-Bopp). In addition, many species were seached for unsuccessfully, some of them with stringent upper limits. We will present a review of these observations and an analysis of their results. These include: (i) limits on small molecules such as ketene (H_2CCO) or methanimine (CH_2NH); (ii) limits on the abundance ratios in families such as HC_5N/HC_3N, ethanol/methanol, acetic acid/formic acid; (iii) searches for precursors of key cometary species such as Na atom and HNC; (iv) marginal detection of acetaldehyde and unidentified lines; (v) limits on deuterated species and other isotopic varieties; (vi) constraints on more exotic species ranging from water dimer (H_2O)_2 to glycine. These results give important constraints on the chemical composition of cometary ices, on the formation mechanisms of cometary material, and on the chemical processes which occur in the inner coma.

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