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    Origin of water in the terrestrial planets

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    Author
    Drake, Michael J.
    Issue Date
    2005-01-01
    Keywords
    Leonard Medal
    accretion disk
    
    Metadata
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    Citation
    Drake, M. J. (2005). Origin of water in the terrestrial planets. Meteoritics & Planetary Science, 40(4), 519-527.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/655985
    DOI
    10.1111/j.1945-5100.2005.tb00960.x
    Additional Links
    https://meteoritical.org/
    Abstract
    I examine the origin of water in the terrestrial planets. Late-stage delivery of water from asteroidal and cometary sources appears to be ruled out by isotopic and molecular ratio considerations, unless either comets and asteroids currently sampled spectroscopically and by meteorites are unlike those falling to Earth 4.5 Ga ago, or our measurements are not representative of those bodies. However, the terrestrial planets were bathed in a gas of H, He, and O. The dominant gas phase species were H2, He, H2O, and CO. Thus, grains in the accretion disk must have been exposed to and adsorbed H2 and water. Here I conduct a preliminary analysis of the efficacy of nebular gas adsorption as a mechanism by which the terrestrial planets accreted "wet." A simple model suggests that grains accreted to Earth could have adsorbed 1-3 Earth oceans of water. The fraction of this water retained during accretion is unknown, but these results suggest that examining the role of adsorption of water vapor onto grains in the accretion disk bears further study.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2005.tb00960.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 40, Number 4 (2005)

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