comets: general; comets: individual: 45P/Honda-Mrkos-Pajdušáková; molecular processes; submillimeter: planetary systems
Abstract :
[en] We present Herschel observations of water isotopologues in the atmosphere of the Jupiter-family comet 45P/Honda-Mrkos-Pajdušáková. No HDO emission is detected, with a 3σ upper limit of 2.0 × 10[SUP]–4[/SUP] for the D/H ratio. This value is consistent with the earlier Herschel measurement in the Jupiter-family comet 103P/Hartley 2. The canonical value of 3 × 10[SUP]–4[/SUP] measured pre-Herschel in a sample of Oort-cloud comets can be excluded at a 4.5σ level. The observations presented here further confirm that a diversity of D/H ratios exists in the comet population and emphasize the need for additional measurements with future ground-based facilities, such as CCAT, in the post-Herschel era.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Lis, D. C.; California Institute of Technology, Pasadena, CA 91125, USA ; Visiting professor, LERMA, École Normale Supérieure, Paris, France.
Biver, N.; LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, Meudon, France
Bockelée-Morvan, D.; LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, Meudon, France
Hartogh, P.; Max-Planck-Institute für Sonnensystemforschung, Katlenburg-Lindau, Germany
Bergin, E. A.; Astronomy Department, University of Michigan, Ann Arbor, MI, USA
Blake, G. A.; California Institute of Technology, Pasadena, CA 91125, USA
Crovisier, J.; LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, Meudon, France
de Val-Borro, M.; Max-Planck-Institute für Sonnensystemforschung, Katlenburg-Lindau, Germany ; Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USA
Küppers, M.; European Space Astronomy Center, Madrid, Spain
Manfroid, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Moreno, R.; LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, Meudon, France
Rengel, M.; Max-Planck-Institute für Sonnensystemforschung, Katlenburg-Lindau, Germany
Szutowicz, S.; Space Research Centre, Polish Academy of Sciences, Warsaw, Poland )
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