Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 774, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/774/1/L3
Keywords
comets: general; comets: individual (45P/Honda-Mrkos-Pajdusakova); molecular processes; submillimeter: planetary systems
Categories
Funding
- NASA through JPL/Caltech
- NSF [AST-1108686]
- NASA [NNX12AH91H]
- Polish MNiSW [181/N-HSO/2008/0]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1118243] Funding Source: National Science Foundation
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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 x 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 x 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.
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