Existence of an 16O-Rich Gaseous Reservoir in the Solar Nebula

Details Existence of an 16O-Rich Gaseous Reservoir in the Solar Nebula Existence of an 16O-Rich Gaseous Reservoir in the Solar Nebula

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sci...295.1051k&link_type=abstract

Science, Volume 295, Issue 5557, pp. 1051-1054 (2002).

Computer Science

48

Scientific paper

Carbonaceous chondrite condensate olivine grains from two distinct petrographic settings, calcium-aluminum-rich inclusion (CAI) accretionary rims and amoeboid olivine aggregates (AOAs), are oxygen-16 (16O) enriched at the level previously observed inside CAIs. This requires that the gas in the nebular region where these grains condensed was 16O-rich. This contrasts with an 16O-poor gas present during the formation of chondrules, suggesting that CAIs and AOAs formed in a spatially restricted region of the solar nebula containing 16O-rich gas. The 16O-rich gas composition may have resulted either from mass-independent isotopic chemistry or from evaporation of regions with enhanced dust/gas ratios, possibly in an X-wind environment near the young Sun.

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