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The composition of ices in comet C/1995 O1 (Hale-Bopp) from radio spectroscopy - Further results and upper limits on undetected species

Crovisier, J. and Bockelée-Morvan, D. and Colom, P. and Biver, N. and Despois, D. and Lis, D. C. and Team for target-of-opportunity radio observations of comets, (2004) The composition of ices in comet C/1995 O1 (Hale-Bopp) from radio spectroscopy - Further results and upper limits on undetected species. Astronomy & Astrophysics, 418 (3). pp. 1141-1157. ISSN 0004-6361.

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From radio spectroscopic observations of comets, more than 22 molecules, radicals and ions, plus several isotopologues, were detected, the majority of them being recently revealed in comets C/1996 B2 (Hyakutake) and C/1995 O1 (Hale-Bopp). Among them, 6 molecules were detected for the first time (Bockelée-Morvan et al. [CITE]) in the course of a spectral survey conducted at radio wavelengths in comet Hale-Bopp with the CSO, the IRAM 30-m telescope and Plateau de Bure interferometer. In addition, many species were searched for unsuccessfully, some of them with stringent upper limits. We present here a review of these observations and further analysis of their results. This include: (i) confirmed detection of acetaldehyde (CH_3CHO); (ii) limits on small molecules such as ketene (H_2CCO) or methanimine (CH_2NH); (iii) limits on the abundance ratios in homologous series such as HC_5N/HC_3N, ethanol/methanol, acetic acid/formic acid; (iv) searches for precursors of key cometary species such as atomic Na and HNC; (v) constraints on more exotic species ranging from water dimer (H_2O)_2 to glycine; (vi) detection of the H_2^(34)S isotopic species and independent observations of HDO and DCN; (vii) limits on several other deuterated species; (viii) limits on several radicals and ions and a tentative detection of the C_2H radical; (ix) the presence of unidentified lines. Typical abundance upper limits of 2–5 x 10^(-4) relative to water are achieved for many species. Better upper limits are obtained for some linear molecules with high dipole moments. But more complex molecules such as dimethyl ether or glycine are poorly constrained. These results should give important clues to the chemical composition of cometary ices, to the formation mechanisms of cometary material, and to the chemical processes which occur in the inner coma.

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Additional Information:© ESO, 2004. Received 14 November 2003 / Accepted 26 January 2004 We are grateful to all the persons who participated in these target-of-opportunity observations: R. Bachiller, D. J. Benford, J. K. Davies, E. Gérard, B. Germain, M. Houde, D. Mehringer, R. Moreno, G. Paubert, T. G. Phillips, H. Rauer, & J. E. Wink. We thank L. H. Coudert, J. Demaison, E. Herbst, I. Kleiner & G. Wlodarczak who contributed to this work by providing lists of molecular transitions. The JPL and Cologne databases were crucial for the preparation of the observations, quick-look reduction and final analysis. This research has been supported by the Centre national de la recherche scientifique, the Programme national de planétologie de l'Institut national des sciences de l'univers, and NSF grant AST 2209008 to the Caltech Submillimeter Observatory. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).
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Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Instituto Geográfico Nacional (IGN)UNSPECIFIED
Subject Keywords:astrochemistry / comets: general / comets: individuals: C/1995 O1 (Hale-Bopp) / line: identification / radio lines: solar system / solar system: formation
Issue or Number:3
Record Number:CaltechAUTHORS:20170408-171816594
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Official Citation:The composition of ices in comet C/1995 O1 (Hale-Bopp) from radio spectroscopy - Further results and upper limits on undetected species J. Crovisier, D. Bockelée-Morvan, P. Colom, N. Biver, D. Despois, D. C. Lis and the Team for target-of-opportunity radio observations of comets A&A, 418 3 (2004) 1141-1157 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76321
Deposited By: 1Science Import
Deposited On:13 Mar 2018 18:15
Last Modified:03 Oct 2019 16:59

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