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Title:
Ocean-like water in the Jupiter-family comet 103P/Hartley 2
Authors:
Hartogh, Paul; Lis, Dariusz C.; Bockelée-Morvan, Dominique; de Val-Borro, Miguel; Biver, Nicolas; Küppers, Michael; Emprechtinger, Martin; Bergin, Edwin A.; Crovisier, Jacques; Rengel, Miriam; Moreno, Raphael; Szutowicz, Slawomira; Blake, Geoffrey A.
Affiliation:
AA(Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany), AB(California Institute of Technology, Pasadena, California 91125, USA), AC(LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France), AD(Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany), AE(LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France), AF(Rosetta Science Operations Centre, European Space Astronomy Centre, 28691 Villanueva de la Cañada, Madrid, Spain), AG(California Institute of Technology, Pasadena, California 91125, USA), AH(Astronomy Department, University of Michigan, Ann Arbor, Michigan 48109, USA), AI(LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France), AJ(Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany), AK(LESIA-Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France), AL(Space Research Centre, Polish Academy of Sciences, 00-716 Warsaw, Poland), AM(California Institute of Technology, Pasadena, California 91125, USA)
Publication:
Nature, Volume 478, Issue 7368, pp. 218-220 (2011). (Nature Homepage)
Publication Date:
10/2011
Origin:
NATURE
Abstract Copyright:
(c) 2011: Nature
DOI:
10.1038/nature10519
Bibliographic Code:
2011Natur.478..218H

Abstract

For decades, the source of Earth's volatiles, especially water with a deuterium-to-hydrogen ratio (D/H) of (1.558+/-0.001)×10-4, has been a subject of debate. The similarity of Earth's bulk composition to that of meteorites known as enstatite chondrites suggests a dry proto-Earth with subsequent delivery of volatiles by local accretion or impacts of asteroids or comets. Previous measurements in six comets from the Oort cloud yielded a mean D/H ratio of (2.96+/-0.25)×10-4. The D/H value in carbonaceous chondrites, (1.4+/-0.1)×10-4, together with dynamical simulations, led to models in which asteroids were the main source of Earth's water, with <=10 per cent being delivered by comets. Here we report that the D/H ratio in the Jupiter-family comet 103P/Hartley 2, which originated in the Kuiper belt, is (1.61+/-0.24)×10-4. This result substantially expands the reservoir of Earth ocean-like water to include some comets, and is consistent with the emerging picture of a complex dynamical evolution of the early Solar System.
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