2014ApJ...785..125A -
Astrophys. J., 785, 125 (2014/April-3)
Carbon-rich planet formation in a solar composition disk.
ALI-DIB M., MOUSIS O., PETIT J.-M. and LUNINE J.I.
Abstract (from CDS):
The C to O ratio is a crucial determinant of the chemical properties of planets. The recent observation of WASP 12b, a giant planet with a C/O value larger than that estimated for its host star, poses a conundrum for understanding the origin of this elemental ratio in any given planetary system. In this paper, we propose a mechanism for enhancing the value of C/O in the disk through the transport and distribution of volatiles. We construct a model that computes the abundances of major C- and O-bearing volatiles under the influence of gas drag, sublimation, vapor diffusion, condensation, and coagulation in a multi-iceline 1+1D protoplanetary disk. We find a gradual depletion in water and carbon monoxide vapors inside the water's iceline, with carbon monoxide depleting slower than water. This effect increases the gaseous C/O and decreases the C/H ratio in this region to values similar to those found in WASP 12b's day side atmosphere. Giant planets whose envelopes were accreted inside the water's iceline should then display C/O values larger than those of their parent stars, making them members of the class of so-called carbon-rich planets.
Abstract Copyright:
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Journal keyword(s):
planets and satellites: atmospheres - planets and satellites: composition - planets and satellites: formation - protoplanetary disks
Simbad objects:
2
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