The ancient heritage of water ice in the solar system
Cleeves, L. Ilsedore
Bergin, Edwin A.
Alexander, Conel M. O’D.
Oberg, Karin I.
Harries, Tim J.
American Association for the Advancement of Science
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.
Science and Technology Facilities Council (STFC)
This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science, Vol. 345 (2014), DOI: 10.1126/science.1258055
Vol. 345 (6204) , pp. 1590 - 1593
Place of publication