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Title:
The {16}OH/18OH and OD/OH isotope ratios in comet C/2002 T7 (LINEAR)
Authors:
Hutsemékers, D.; Manfroid, J.; Jehin, E.; Zucconi, J.-M.; Arpigny, C.
Affiliation:
AA(Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, 4000 Liège, Belgique ), AB(Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, 4000 Liège, Belgique), AC(Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, 4000 Liège, Belgique), AD(Observatoire de Besançon, 25010 Besançon Cedex, France), AE(Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, 4000 Liège, Belgique)
Publication:
Astronomy and Astrophysics, Volume 490, Issue 3, 2008, pp.L31-L34 (A&A Homepage)
Publication Date:
11/2008
Origin:
EDP Sciences
Astronomy Keywords:
comets: general, comets: individual: C/2002 T7 (LINEAR)
DOI:
10.1051/0004-6361:200810833
Bibliographic Code:
2008A&A...490L..31H

Abstract

The 16OH/18OH and OD/OH isotope ratios are measured in the Oort-Cloud comet C/2002 T7 (LINEAR) through ground-based observations of the OH A 2Sigma+ - X 2Pii ultraviolet bands at 3063 Å (0, 0) and 3121 Å (1, 1) obtained with the Very Large Telescope (VLT) feeding the Ultraviolet-Visual Echelle Spectrograph (UVES). From the 16OH/18OH ratio, we find 16O/18O = 425 ± 55, equal within the uncertainties to the terrestrial value and to the ratio measured in other comets, although marginally smaller. We also estimate OD/OH from which we derive D/H = 2.5 ± 0.7× 10-4 in water. This value is compatible with the water D/H ratios evaluated in other comets and is marginally higher than the terrestrial value.

Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO Programme 073.C-0525).

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