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Radio spectroscopic observations of Comet 19P/Borrelly were performed during the 1994 apparition and at, and near, the time of the Deep Space 1 flyby in 2001. HCN, CS, CH 3 OH, and H 2 CO were detected using the 30-m telescope of the Institut de Radioastronomie Millimetrique and the James Clerk Maxwell Telescope, and their production rates relative to water are estimated to be 0.06-0...
We have elaborated an evolutionary turbulent model of the subnebula of Saturn derived from that of Dubrulle (1993, Icarus106, 59-76) for the solar nebula, which is valid for a geometrically thin disk. We demonstrate that if carbon and nitrogen were in the form of CO and N 2 , respectively, in the early subnebula, these molecules were not subsequently converted into CH 4 and NH ...
We have monitored the 1 10 -1 01 pure rotational transition of water vapor near 557 GHz toward Comet C/1999 H1 (Lee) over the period 1999 September 5 through 1999 December 8, using the Submillimeter Wave Astronomy Satellite. The measured antenna temperatures implied water production rates that declined from 3.2x10 28 s -1 on 1999 September 5-8 to...
This report is the follow-up of the paper of A. Drouart et al. (1999, Icarus140, 129) in which it was demonstrated that appropriate models of the solar nebula permit us to interpret the deuterium enrichment in water with respect to the protosolar D/H ratio measured in LL3 meteorites and comets. In the present report, we show that the models selected by Drouart et al. are also able to explain D/H in...
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