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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
- 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.
- Publication
Nature, 2011, Vol 478, Issue 7368, p218
- ISSN
1476-4687
- Publication type
Journal Article
- DOI
10.1038/nature10519