Refractory Carbon Depletion and C/O ratios of Exoplanetary Atmospheres

Carbon depletion in Solar system solids and their effect on atmospheric C/O of exoplanets.

There is a known gradient in the level of carbon depletion (relative to Si) in the refractory solids of our solar system, the source of which is currently unknown. Regardless this carbon must have been present (at least early in the disk life) in the gas, and as a result would be available for accretion into planetary atmospheres. Assuming that this carbon depletion occurs in all exo-solar systems, I will present two simple models for the distribution and evolution of this excess carbon and show how these model impact the resulting atmospheric C/O in synthetic planets.

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