Other
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.4306c&link_type=abstract
American Astronomical Society, DPS Meeting #33, #43.06; Bulletin of the American Astronomical Society, Vol. 33, p.1121
Other
2
Scientific paper
Comet C/1999 T1 (McNaught-Hartley) was observed at radio wavelengths using the Swedish-ESO Submillimetre Telescope (SEST), Caltech Submillimeter Observatory (CSO), Institut de RadioAstronomie Millimétrique (IRAM) 30-m, and Nançay telescopes between September 2000 and February 2001. Comet C/2001 A2 (LINEAR) was also observed with the CSO, IRAM and Nançay telescopes, as well as with the Kitt Peak 12-m Radio Telescope, between April and July 2001. The lines of OH, HCN, CH3OH, H2CO, H2S, CS, were detected in both comets. In addition, CO was detected in C/1999 T1, and HNC and CH3CN were detected in C/2001 A2. These two Oort cloud comets presented similar intrinsic activity levels, with a water outgassing rate peaking at around 1029 molecules s-1 near perihelion. However, C/2001 A2 showed a much steeper heliocentric evolution of its activity, and a dramatic outburst of ≈ 4 magnitudes at 1.3 AU inbound. The gaseous composition of these comets also presents some significant differences: CO is much more abundant (with respect to HCN and CH3OH) in C/1999 T1, while another very volatile molecule, H2S, is more abundant in C/2001 A2. In C/2001 A2, the HNC, CS and H2CO abundances (relative to HCN or H2S and CH3OH) show variations with heliocentric distance and/or cometary activity. Similar behaviors were seen in comet C/1995 O1 (Hale-Bopp). Sensitive searches of HC3N and OCS in C/2001 A2 suggest that these species are depleted with respect to HCN, CH3CN or H2S, in comparison with what was measured in comet Hale-Bopp.
Biver Nicolas
Bockelée-Morvan Dominique
Colom Pierre
Crovisier Jacques
Despois Didier
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