Photochemical Speciation of Oxygen Isotopes in the Solar Nebula

Details Photochemical Speciation of Oxygen Isotopes in the Solar Nebula Photochemical Speciation of Oxygen Isotopes in the Solar Nebula

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..341..193l&link_type=abstract

Chondrites and the Protoplanetary Disk, ASP Conference Series, Vol. 341, Proceedings of a workshop held 8-11 November 2004 in Ka

Astronomy and Astrophysics

Astronomy

Scientific paper

We have performed time-dependent photochemical calculations of CO self-shielding in the surface region of a turbulent nebula, and demonstrated that substantial mass-independent fractionation in bulk oxygen isotopes in the nebula was possible on timescales of 105 years. CO photodissociation in the presence of abundant H2 yields δ-values for nebular H2O with δ 17O/δ 18O near 1.0, consistent with measurements in Ca-Al-rich inclusions. This mechanism provides a self-consistent explanation for the oxygen isotope values of nebular water inferred from secondary minerals in unequilibrated chondrites, and places constraints on the far-ultraviolet radiation in the solar nebula environment and the strength of turbulent vertical mixing in the nebula.

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