Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dps....31.3208a&link_type=abstract
American Astronomical Society, DPS meeting #31, #32.08
Other
Scientific paper
The interpretation of the S_2 that was discovered in comet IRAS-Araki-Alcock was clouded by the inability to find it in the extant spectra of any other comets. The close approach of comet Hyakutake in 1996 enabled us to again detect S_2 in a comet, this time including both ground-based and Earth-orbital observations spread over several weeks. The lack of any correlation between the S_2 in comet Hyakutake with either outbursts of the comet or anomalies in the interplanetary magnetic field argues against some of the scenarios invoked in the case of IRAS-Araki-Alcock. Furthermore, the discovery of SO and SO_2 in Hale-Bopp removes the most obvious obstacle to the scenario in which the S_2 was produced by primordial irradiation of icy grains. We are left, therefore, with either fast chemical reactions in the innermost coma (within tens of km of the nucleus) or a direct source in the nucleus, which in turn would imply that the material had been preserved in a very cold state. We will present both the ground-based and the Earth-orbital data on S_2 and we will discuss the abundance and the source of S_2. This work was supported by NASA.
A'Hearn Michael F.
Arpigny Claude
Feldman Paul D.
Jackson William M.
Kim Jai Sam
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