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A HERSCHEL STUDY OF D/H IN WATER IN THE JUPITER-FAMILY COMET 45P/HONDA-MRKOS-PAJDUŠÁKOVÁ AND PROSPECTS FOR D/H MEASUREMENTS WITH CCAT

2013; IOP Publishing; Volume: 774; Issue: 1 Linguagem: Inglês

10.1088/2041-8205/774/1/l3

2041-8213

D. C. Lis, N. Biver, D. Bockelée‐Morvan, P. Hartogh, Edwin A. Bergin, G. A. Blake, J. Crovisier, M. de Val-Borro, Emmanuël Jehin, M. Küppers, Jean Manfroid, R. Moreno, M. Rengel, S. Szutowicz,

Planetary Science and Exploration

We present Herschel observations of water isotopologues in the atmosphere of the Jupiter-family comet 45P/Honda-Mrkos-Pajdusakova. No HDO emission is detected, with a 3 sigma upper limit of 2.0 10-4 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 10-4 measured pre-Herschel in a sample of Oort-cloud comets can be excluded at a 4.5 sigma 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.