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The 3D Thermal, Dynamical, and Chemical Structure of the Atmosphere of HD 189733b: Implications of Wind-driven Chemistry for the Emission Phase Curve

Abstract : In this paper we present 3D atmospheric simulations of the hot Jupiter HD 189733b under two different scenarios: local chemical equilibrium and including advection of the chemistry by the resolved wind. Our model consistently couples the treatment of dynamics, radiative transfer, and chemistry, completing the feedback cycle between these three important processes. The effect of wind-driven advection on the chemical composition is qualitatively similar to our previous results for the warmer atmosphere of HD 209458b, found using the same model. However, we find more significant alterations to both the thermal and dynamical structure for the cooler atmosphere of HD 189733b, with changes in both the temperature and wind velocities reaching ∼10%. We also present the contribution function, diagnosed from our simulations, and show that wind-driven chemistry has a significant impact on its 3D structure, particularly for regions where methane is an important absorber. Finally, we present emission phase curves from our simulations and show the significant effect of wind-driven chemistry on the thermal emission, particularly within the 3.6 μm Spitzer/IRAC channel.
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https://hal-insu.archives-ouvertes.fr/insu-03711198
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Submitted on : Friday, July 1, 2022 - 11:22:29 AM
Last modification on : Saturday, July 2, 2022 - 3:40:04 AM

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Benjamin Drummond, Nathan J. Mayne, James Manners, Isabelle Baraffe, Jayesh Goyal, et al.. The 3D Thermal, Dynamical, and Chemical Structure of the Atmosphere of HD 189733b: Implications of Wind-driven Chemistry for the Emission Phase Curve. The Astrophysical Journal, 2018, 869, ⟨10.3847/1538-4357/aaeb28⟩. ⟨insu-03711198⟩

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