Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.4008h&link_type=abstract
American Astronomical Society, DPS Meeting #32, #40.08; Bulletin of the American Astronomical Society, Vol. 32, p.1071
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We will present the recent progress on our work on the evaluation of the chemistry of the C2 and C3 radicals in the coma of comet C/1995 O1 Hale-Bopp. The chemistry of the C-bearing molecules in the cometary coma is still not fully understood. A number of parent molecules have been proposed for C2. Only recently two of them, C2H2 and C2H6, could be detected in the extremely bright comets Hale-Bopp and Hyakutake. C3H4 has been proposed as the parent molecule for C3, but until now, there has been no detection of C3H4, or any of its daughter-molecules except C3, in a cometary coma. We are using observations of C2 and C3 emissions obtained during a long-term monitoring program of comet Hale-Bopp (Rauer et al., Science, 1997, 275; ACM, 1999). Due to the high activity of this comet it was possible to detect C3 emissions in the coma as far as 7 AU from the sun and C2 emissions up to 5 AU. This exceptional dataset allows to analyze possible reaction pathways for the formation of the C2 and C3 radicals. For this study we investigate the various reaction pathways by using a restricted chemistry code including only photochemistry and a detailed neutral coma model including in addition a detailed gas-phase chemistry, dust entrainment by the gas and seperate flow of the neutral gas.
Boice Dan
Helbert Jérôme
Huebner Walter
Rauer Heike
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