New molecules found in comet C/1995 O1 (Hale-Bopp) Investigating the link between cometary and interstellar material
Bockelée-Morvan, D. and Lis, D.C. and Wink, J.E. and Despois, D. and Crovisier, J. and Bachiller, R. and Benford, D. and Biver, N. and Colom, P. and Davies, J.K. and Gérard, E. and Germain, B. and Houde, M. and Mehringer, D. and Moreno, R. and Phillips, T.G. and Paubert, G. and Rauer, H. (2000) New molecules found in comet C/1995 O1 (Hale-Bopp) Investigating the link between cometary and interstellar material. Astronomy and Astrophysics, 353, pp. 1103-1114.
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We present millimetre and submillimetre observations of comet C/1995 O1 (Hale-Bopp) undertaken near perihelion with the Caltech Submillimeter Observatory and the 30-m telescope and Plateau-de-Bure interferometer of the Institut de Radioastronomie Millimétrique. From a spectral molecular survey, six new cometary molecular species have been identified for the first time in a comet: SO, SO2, HC3N, NH2CHO, HCOOH, and HCOOCH3. Relative abundances with respect to water are 0.3% (SO), 0.2% (SO2), 0.02% (HC3N), 0.01-0.02% (NH2CHO), 0.09% (HCOOH), and 0.08% (HCOOCH3). Several rotational transitions of OCS and HNCO, whose first identifications were made previously in comet C/1996 B2 (Hyakutake), have also been detected, confirming that these molecular species are ubiquitous compounds of cometary atmospheres. Inferred abundances of OCS and HNCO relative to water in comet Hale-Bopp are 0.4% and 0.1%, respectively. During this observational campaign, we also observed rotational lines of HCN, HNC, CH3CN, CO, CH3OH, H2CO, H2S, and CS. In combination with results of other observations, a comprehensive view of the volatile composition of the coma of comet Hale-Bopp is obtained. A quantitative comparison shows that chemical abundances in comet Hale-Bopp parallel those inferred in interstellar ices, hot molecular cores and bipolar flows around protostars. This suggests that the processes at work in the interstellar medium, in particular grain surface chemistry, played a major role in the formation of cometary ices. It supports models in which cometary volatiles formed in the interstellar medium and suffered little processing in the Solar Nebula.
|Title:||New molecules found in comet C/1995 O1 (Hale-Bopp) Investigating the link between cometary and interstellar material|
|Journal or Publication Title:||Astronomy and Astrophysics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1103-1114|
|Keywords:||comets: general comets: individual: C/1995 01 Hale-Bopp solar system: formation ISM: molecules radio lines: solar syste|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institut für Weltraumsensorik und Planetenerkundung|
|Deposited By:||Susanne Pieth|
|Deposited On:||08 Dec 2005|
|Last Modified:||22 Feb 2010 16:55|
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