CAVALIÉ, Thibaut; VENOT, Olivia; SELSIS, Franck; HERSANT, Franck; HARTOGH, P.; LECONTE, Jérémy

doi:10.1016/j.icarus.2017.03.015

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CAVALIÉ, Thibaut
Laboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA (UMR_8109)]

VENOT, Olivia
Laboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA (UMR_8109)]

SELSIS, Franck
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

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Icarus. 2017, vol. 291, p. 1-16

Elsevier

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Thermochemical models have been used in the past to constrain the deep oxygen abundance in the gas and ice giant planets from tropospheric CO spectroscopic measurements. Knowing the oxygen abundance of these planets is a key to better understand their formation. These models have widely used dry and/or moist adiabats to extrapolate temperatures from the measured values in the upper troposphere down to the level where the thermochemical equilibrium between H2O and CO is established. The mean molecular mass gradient produced by the condensation of H2O stabilizes the atmosphere against convection and results in a vertical thermal profile and H2O distribution that departs significantly from previous estimates. We revisit O/H estimates using an atmospheric structure that accounts for the inhibition of the convection by condensation. We use a thermochemical network and the latest observations of CO in Uranus and Neptune to calculate the internal oxygen enrichment required to satisfy both these new estimates of the thermal profile and the observations. We also present the current limitations of such modeling.< Leer menos

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Abundances

atmospheres

interior

Uranus

Neptune

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Thermochemistry and vertical mixing in the tropospheres of Uranus and Neptune: How convection inhibition can affect the derivation of deep oxygen abundances

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