Computer Science
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icar..153..162d&link_type=abstract
Icarus, Volume 153, Issue 1, pp. 162-179 (2001).
Computer Science
27
Scientific paper
Ethane (C2H6) was detected in Comet C/1995 O1 Hale-Bopp on 13 dates between UT 1996 September 20.3 (Rh=3.01 AU pre-perihelion) and 1997 September 25.7 (Rh=2.83 AU post-perihelion) using high-resolution infrared spectroscopy. Production rates and rotational temperatures were measured, and the derived heliocentric dependence for ethane production was Q=(5.52+/-0.20)×1028 [Rh(-2.43+/-0.13)] molecules s-1. The spatial distribution of C2H6 molecules in the coma was consistent with all ethane being released directly from the nucleus, although the possibility that a small fraction was released as a distributed source cannot be excluded. When our derived production rates for ethane, water, and acetylene (C2H2) are compared, we obtain an average relative abundance of C2H6/H2O=(6.23+/-0.42)×10- 3, and C2H6/C2H2=2.4+/-0.7. The high ethane abundance relative to acetylene in Hale-Bopp suggests its ices were altered by radiation processing and/or hydrogen-atom addition reactions on the surfaces of ice-mantled grains in the natal cloud. These results are not consistent with ices in Hale-Bopp originating in a thermally or chemically equilibrated region of the solar nebula.
Dello Russo Neil
DiSanti Michael A.
Magee-Sauer Karen
Mumma Michael J.
Novak Robert
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