Fractionation of noble gases by thermal escape from accreting planetesimals

Details Fractionation of noble gases by thermal escape from accreting planetesimals Fractionation of noble gases by thermal escape from accreting planetesimals

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66..195d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 66, May 1986, p. 195-210.

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17

Planetary Evolution, Protoplanets, Rare Gases, Terrestrial Planets, Thermal Emission, Accretion Disks, Astronomical Models, Fractionation, Jeans Theory, Planetary Atmospheres

Scientific paper

Assuming solar initial elemental and isotopic ratios and a determination of the degree of fractionation occurring by competition between gravitational binding and escape, a model is developed for selective noble gas loss through escape during the growth of planetesimals to form the terrestrial planets. Of the two classes of planetesimals that can form on a time scale that is consistent with modern accretion models, one is depleted in neon while the other is neon-rich. The mechanism is noted to be capable of accounting for all known properties of the noble gas volatiles on the terrestrial planets, with only one exception, namely the Ar-36/Ar-38 ratios for Mars and the earth, which are much lower than observed.

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