Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.3713m&link_type=abstract
American Astronomical Society, DPS meeting #29, #37.13; Bulletin of the American Astronomical Society, Vol. 29, p.1049
Astronomy and Astrophysics
Astronomy
Scientific paper
Abundant ethane (C_2H_6) was detected in Comet C/1996 B2 and in Comet C/1995 01 with the use of high-resolution infrared spectroscopy at the NASA Infrared Telescope Facility on Mauna Kea. Ro-vibrational lines of the nu_7 band were used to derive production rates and rotational temperatures for ethane in these two comets. It was found that the ratio of C_2H_6/H_2O was higher in Comet C/1996 B2 by about a factor of two. A high abundance of ethane is consistent with production of C_2H_6 in modified icy grain mantles in the natal cloud. Ethane could form either by photolysis of methane rich ice or by hydrogen- addition reactions to condensed acetylene. The lower abundance of ethane relative to water in C/1995 01 suggests that processing of pre-cometary ices varied for these two comets.
Dello Russo Neil
DiSanti Michael A.
Fomenkova Marina
Magee-Sauer Karen
Mumma Michael J.
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