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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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Abstract

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.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2000,
Title:New molecules found in comet C/1995 O1 (Hale-Bopp) Investigating the link between cometary and interstellar material
Authors:
AuthorsInstitution or Email of Authors
Bockelée-Morvan, D.Observatoire de Paris, 92195 Meudon, France
Lis, D.C.California Institute of Technology, MS 320-47, Pasadena, CA 91125, USA
Wink, J.E.Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, 38406 Grenoble, France
Despois, D.Observatoire de Bordeaux, B.P. 89, 33270 Floirac, France
Crovisier, J.Observatoire de Paris, 92195 Meudon, France
Bachiller, R.Instituto Geográfico Nacional, Observatorio Astronómico Nacional, Alcalá de Henares
Benford, D.California Institute of Technology, MS 320-47, Pasadena, CA 91125, USA
Biver, N.Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
Colom, P.Observatoire de Paris, 92195 Meudon, France
Davies, J.K.Joint Astronomy Centre, 680 North A'Ohoku Place, University Park, Hilo, HI 96720-6030, USA
Gérard, E.Observatoire de Paris, 92195 Meudon, France
Germain, B.Observatoire de Paris, 92195 Meudon, France
Houde, M.Caltech Submillimeter Observatory, Hilo, USA
Mehringer, D.University of Illinois, Department of Astronomy, 1002 W. Green St., Urbana, IL 61801, USA
Moreno, R.Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, 38406 Grenoble, France
Phillips, T.G.California Institute of Technology, MS 320-47, Pasadena, CA 91125, USA
Paubert, G.Instituto de Radioastronomía Millimétrica, Avenida Divina Pastora 7, Núcleo Central, 18012 Granada, Spain
Rauer, H.UNSPECIFIED
Date:2000
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:353
Page Range:pp. 1103-1114
Status:Published
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
Location: Berlin-Adlershof
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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