Science
Oxygen isotopic heterogeneity in the early Solar System inherited from the protosolar molecular cloud – Science Advances
The Sun is 16O-enriched (Δ17O = −28.4 ± 3.6‰) relative to the terrestrial planets, asteroids, and chondrules (−7‰ < Δ17O < 3‰). Ca,Al-rich inclusions (CAIs), th...
Abstract
The Sun is 16O-enriched (17O = 28.4 ± 3.6) relative to the terrestrial planets, asteroids, and chondrules (7 < 17O < 3). Ca,Al-rich inclusions (CAIs), the oldest Solar System solids, approach the Suns 17O. Ultraviolet CO self-shielding resulting in formation of 16O-rich CO and 17,18O-enriched water is the currently favored mechanism invoked to explain the observed range of 17O. However, the location of CO self-shielding (molecular cloud or protoplanetary disk) remains unknown. He…
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