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Atmospheric Circulation of Eccentric Hot Jupiter HAT-P-2b

Lewis, Nikole K. and Showman, Adam P. and Fortney, Jonathan J. and Knutson, Heather A. and Marley, Mark S. (2014) Atmospheric Circulation of Eccentric Hot Jupiter HAT-P-2b. Astrophysical Journal, 795 (2). Art. No. 150. ISSN 0004-637X. doi:10.1088/0004-637X/795/2/150.

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The hot Jupiter HAT-P-2b has become a prime target for Spitzer Space Telescope observations aimed at understanding the atmospheric response of exoplanets on highly eccentric orbits. Here we present a suite of three-dimensional atmospheric circulation models for HAT-P-2b that investigate the effects of assumed atmospheric composition and rotation rate on global scale winds and thermal patterns. We compare and contrast atmospheric models for HAT-P-2b, which assume one and five times solar metallicity, both with and without TiO/VO as atmospheric constituents. Additionally we compare models that assume a rotation period of half, one, and two times the nominal pseudo-synchronous rotation period. We find that changes in assumed atmospheric metallicity and rotation rate do not significantly affect model predictions of the planetary flux as a function of orbital phase. However, models in which TiO/VO are present in the atmosphere develop a transient temperature inversion between the transit and secondary eclipse events that results in significant variations in the timing and magnitude of the peak of the planetary flux compared with models in which TiO/VO are omitted from the opacity tables. We find that no one single atmospheric model can reproduce the recently observed full orbit phase curves at 3.6, 4.5 and 8.0 μm, which is likely due to a chemical process not captured by our current atmospheric models for HAT-P-2b. Further modeling and observational efforts focused on understanding the chemistry of HAT-P-2b's atmosphere are needed and could provide key insights into the interplay between radiative, dynamical, and chemical processes in a wide range of exoplanet atmospheres.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper DOIArticle
Lewis, Nikole K.0000-0002-8507-1304
Fortney, Jonathan J.0000-0002-9843-4354
Knutson, Heather A.0000-0002-0822-3095
Marley, Mark S.0000-0002-5251-2943
Additional Information:© 2014 The American Astronomical Society. Received 2013 November 11; accepted 2014 September 15; published 2014 October 23. This work was performed in part under contract with the California Institute of Technology (Caltech) funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. A.P.S. was supported by NASA Origins grant NNX12AI79G. M.S.M. acknowledges support from the NASA PATM program. N.K.L. wishes to thank C. Visscher for valuable discussions regarding possible chemical processes at work in HAT-P-2b’s atmosphere. The authors thank the anonymous referee for their valuable comments on the manuscript.
Funding AgencyGrant Number
Subject Keywords:atmospheric effects; methods: numerical; planets and satellites: general; planets and satellites: individual (HAT-P-2b)
Issue or Number:2
Record Number:CaltechAUTHORS:20141201-152434753
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Official Citation:Atmospheric Circulation of Eccentric Hot Jupiter HAT-P-2b Nikole K. Lewis et al. 2014 ApJ 795 150
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52247
Deposited By: Tony Diaz
Deposited On:01 Dec 2014 23:39
Last Modified:10 Nov 2021 19:23

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