Journal
SCIENCE
Volume 345, Issue 6204, Pages 1590-1593Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1258055
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Funding
- NSF [AST-1008800]
- NASA [NNA09DA81A, NNX11AG67G, NNX12A193G]
- U.K. Science and Technology Facilities Council [ST/J001627/1]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1008800] Funding Source: National Science Foundation
- NASA [NNX11AG67G, 144076] Funding Source: Federal RePORTER
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Identifying the source of Earth's water is central to understanding the origins of life-fostering environments and to assessing the prevalence of such environments in space. Water throughout the solar system exhibits deuterium-to-hydrogen enrichments, a fossil relic of low-temperature, ion-derived chemistry within either (i) the parent molecular cloud or (ii) the solar nebula protoplanetary disk. Using a comprehensive treatment of disk ionization, we find that ion-driven deuterium pathways are inefficient, which curtails the disk's deuterated water formation and its viability as the sole source for the solar system's water. This finding implies that, if the solar system's formation was typical, abundant interstellar ices are available to all nascent planetary systems.
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