Ocean-like water in the Jupiter-family comet 103P/Hartley 2

Paul Hartogh (), Dariusz C. Lis, Dominique Bockelée-Morvan, Miguel de Val-Borro, Nicolas Biver, Michael Küppers, Martin Emprechtinger, Edwin A. Bergin, Jacques Crovisier, Miriam Rengel, Raphael Moreno, Slawomira Szutowicz and Geoffrey A. Blake
Additional contact information
Paul Hartogh: Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2
Dariusz C. Lis: California Institute of Technology
Dominique Bockelée-Morvan: LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen
Miguel de Val-Borro: Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2
Nicolas Biver: LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen
Michael Küppers: Rosetta Science Operations Centre, European Space Astronomy Centre, 28691 Villanueva de la Cañada
Martin Emprechtinger: California Institute of Technology
Edwin A. Bergin: University of Michigan
Jacques Crovisier: LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen
Miriam Rengel: Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2
Raphael Moreno: LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen
Slawomira Szutowicz: Space Research Centre, Polish Academy of Sciences
Geoffrey A. Blake: California Institute of Technology

Nature, 2011, vol. 478, issue 7368, 218-220

Abstract: A drop in the ocean Earth's bulk composition is similar to that of a group of oxygen-poor meteorites called enstatite chondrites, thought to have formed in the early solar nebula. This leads to the suggestion that proto-Earth was dry, and that volatiles including water were delivered by asteroid and comet impacts. The deuterium-to-hydrogen (D/H) ratios measured in six Oort cloud comets are much higher than on Earth, however, apparently ruling out a dominant role for such bodies. Now the Herschel Space Telescope has been used to determine the D/H ratio in the Kuiper belt comet 103P/Hartley 2. The ratio is Earth-like, suggesting that this population of comets may have contributed to Earth's ocean waters.

Date: 2011
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DOI: 10.1038/nature10519

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