New Molecular Species in Comet C/1995 O1 (Hale-Bopp) Observed with the Caltech Ssubmillimeter Observatory |
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| Authors: | Lis D C Mehringer D M Benford D Gardner M Phillips T G Bockelée-Morvan D Biver N Colom P Crovisier J Despois D Rauer H |
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| Institution: | (1) Downs Laboratory of Physics, California Institute of Technology, MS 320–47, Pasadena, CA 91125, USA;(2) Observatoire de Paris, F–92195 Meudon Principal Cedex, France;(3) Observatoire de Bordeaux, B.P. 89, F–33270 Floirac, France;(4) DLR, Institut füur Planetenerkundung, Berlin, Germany |
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| Abstract: | We present millimeter-wave observations of HNCO, HC3N, SO, NH2CHO, H13CN, and H3O+ in comet C/1995 O1 (Hale-Bopp)obtained in February–April, 1997 with the Caltech Submillimeter Observatory (CSO). HNCO, first
detected at the CSO in comet C/1996B2 (Hyakutake), is securely confirmed in comet Hale-Bopp via observations of three rotational
transitions. The derived abundance with respect to H2O is (4-13) × 10-4. HC3N, SO, and NH2CHO are detected for the first time in a comet. The fractional abundance of HC3N based on observations of three rotational lines is (1.9 ± 0.2) × 10-4. Four transitions of SO are detected and the derived fractional abundance, (2-8) ×10-3, is higher than the upper limits derived from UV observations of previous comets. Observations of NH2CHO imply a fractional abundance of (1-8) × 10-4. H3O is detected for the first time from the ground. The H13CN (3-2)transition is also detected and the derived HCN/H13CN abundance ratio is 90 ± 15, consistent with the terrestrial12C/13C ratio. In addition, a number of other molecular species are detected, including HNC, OCS, HCO+, CO+, and CN(the last two are first detections in a comet at radio wavelengths).
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Comets composition radio observations spectroscopy |
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