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Atmospheric circulation of hot Jupiters: Coupled radiative-dynamical general circulation model simulations of HD 189733b and HD 209458b

Showman, Adam P. and Fortney, Jonathan J. and Lian, Yuan and Marley, Mark S. and Freedman, Richard S. and Knutson, Heather A. and Charbonneau, David (2009) Atmospheric circulation of hot Jupiters: Coupled radiative-dynamical general circulation model simulations of HD 189733b and HD 209458b. Astrophysical Journal, 699 (1). pp. 564-584. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20190515-102317810

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Abstract

We present global, three-dimensional numerical simulations of HD 189733b and HD 209458b that couple the atmospheric dynamics to a realistic representation of nongray cloud-free radiative transfer. The model, which we call the Substellar and Planetary Atmospheric Radiation and Circulation model, adopts the MITgcm for the dynamics and uses the radiative model of McKay, Marley, Fortney, and collaborators for the radiation. Like earlier work with simplified forcing, our simulations develop a broad eastward equatorial jet, mean westward flow at higher latitudes, and substantial flow over the poles at low pressure. For HD 189733b, our simulations without TiO and VO opacity can explain the broad features of the observed 8 and 24 μm light curves, including the modest day-night flux variation and the fact that the planet/star flux ratio peaks before the secondary eclipse. Our simulations also provide reasonable matches to the Spitzer secondary-eclipse depths at 4.5, 5.8, 8, 16, and 24 μm and the ground-based upper limit at 2.2 μm. However, we substantially underpredict the 3.6 μm secondary-eclipse depth, suggesting that our simulations are too cold in the 0.1-1 bar region. Predicted temporal variability in secondary-eclipse depths is ~1% at Spitzer bandpasses, consistent with recent observational upper limits at 8 μm. We also show that nonsynchronous rotation can significantly alter the jet structure. For HD 209458b, we include TiO and VO opacity; these simulations develop a hot (>2000 K) dayside stratosphere whose horizontal dimensions are small at depth but widen with altitude. Despite this stratosphere, we do not reproduce current Spitzer photometry of this planet. Light curves in Spitzer bandpasses show modest phase variation and satisfy the observational upper limit on day-night phase variation at 8 μm.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1088/0004-637x/699/1/564DOIArticle
https://arxiv.org/abs/0809.2089arXivDiscussion Paper
ORCID:
AuthorORCID
Fortney, Jonathan J.0000-0002-9843-4354
Marley, Mark S.0000-0002-5251-2943
Knutson, Heather A.0000-0002-0822-3095
Charbonneau, David0000-0002-9003-484X
Additional Information:© 2009 The American Astronomical Society. Received 2008 September 7; accepted 2009 May 4; published 2009 June 12. This research was supported by NASA Origins grant NNX08AF27G and Planetary Atmospheres grants NNX07AF35G and NNG06GF28G to A.P.S.
Funders:
Funding AgencyGrant Number
NASANNX08AF27G
NASANNX07AF35G
NASANNG06GF28G
Subject Keywords:atmospheric effects – methods: numerical – planets and satellites: general – planets and satellites: individual (HD 209458b, HD 189733b)
Issue or Number:1
Record Number:CaltechAUTHORS:20190515-102317810
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190515-102317810
Official Citation:Adam P. Showman et al 2009 ApJ 699 564
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95507
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 May 2019 22:39
Last Modified:09 Mar 2020 13:18

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