Implications of three-dimensional chemical transport in hot Jupiter atmospheres: Results from a consistently coupled chemistry-radiation-hydrodynamics model
In: ISSN: 0004-6361, 2020
Online
academicJournal
Zugriff:
International audience ; We present results from a set of simulations using a fully coupled three-dimensional (3D) chemistry-radiation-hydrodynamics model and investigate the effect of transport of chemical species by the large-scale atmospheric flow in hot Jupiter atmospheres. We coupled a flexible chemical kinetics scheme to the Met Office Unified Model, which enables the study of the interaction of chemistry, radiative transfer, and fluid dynamics. We used a newly-released “reduced” chemical network, comprising 30 chemical species, that was specifically developed for its application in 3D atmosphere models. We simulated the atmospheres of the well-studied hot Jupiters HD 209458b and HD 189733b which both have dayside–nightside temperature contrasts of several hundred Kelvin and superrotating equatorial jets. We find qualitatively quite different chemical structures between the two planets, particularly for methane (CH4), when advection of chemical species is included. Our results show that consideration of 3D chemical transport is vital in understanding the chemical composition of hot Jupiter atmospheres. Three-dimensional mixing leads to significant changes in the abundances of absorbing gas-phase species compared with what would be expected by assuming local chemical equilibrium, or from models including 1D – and even 2D – chemical mixing. We find that CH4, carbon dioxide (CO2), and ammonia (NH3) are particularly interesting as 3D mixing of these species leads to prominent signatures of out-of-equilibrium chemistry in the transmission and emission spectra, which are detectable with near-future instruments.
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Implications of three-dimensional chemical transport in hot Jupiter atmospheres: Results from a consistently coupled chemistry-radiation-hydrodynamics model
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Autor/in / Beteiligte Person: | Drummond, Benjamin ; Hébrard, Eric ; Mayne, Nathan J. ; Venot, Olivia ; Ridgway, Robert J. ; Changeat, Quentin ; Tsai, Shang-Min ; Manners, James ; Tremblin, Pascal ; Abraham, Nathan Luke ; Sing, David ; Kohary, Krisztian ; School of Physics and Astronomy Exeter ; University of Exeter ; United Kingdom Met Office Exeter ; Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) ; University College of London London (UCL) ; University of Oxford ; Maison de la Simulation (MDLS) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut National de Recherche en Informatique et en Automatique (Inria)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ; National Centre for Atmospheric Science Leeds (NCAS) ; Natural Environment Research Council (NERC) ; University of Cambridge UK (CAM) ; Johns Hopkins University (JHU) ; funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 758892, ExoAI). ; European Union’s Horizon 2020 COMPET programme (grant agreement No 776403, ExoplANETS A). ; CNRS/INSU Programme National de Planétologie (PNP) and the Centre National d’Études Spatiales (CNES) ; European Research Council under Grant Agreement ATMO 757 858. ; European Project: 617119,EC:FP7:ERC,ERC-2013-CoG,EXOLIGHTS(2014) |
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Zeitschrift: | ISSN: 0004-6361, 2020 |
Veröffentlichung: | HAL CCSD ; EDP Sciences, 2020 |
Medientyp: | academicJournal |
DOI: | 10.1051/0004-6361/201937153 |
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