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Two Classes of Hot Jupiter Atmospheres

Published online by Cambridge University Press:  01 May 2008

Jonathan J. Fortney
Jonathan J. Fortney*
Affiliation:
Dept. of Astronomy & Astrophysics, UCO/Lick ObservatoryUniversity of California, Santa Cruz, CA, USA email: [email protected]
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Abstract

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We highlight the potential importance of gaseous TiO and VO opacity on the highly irradiated close-in giant planets. The day-side atmospheres of these planets may naturally fall into two classes that are somewhat analogous to the M- and L-type dwarfs. Those that are warm enough to have appreciable opacity due to TiO and VO gases we term the “pM Class” planets, and those that are cooler, such that Ti and V are predominantly in solid condensates, we term “pL Class” planets. The optical spectra of pL Class planets are dominated by neutral atomic Na and K absorption. We discuss a connection between temperature inversions and large day/night temperature contrasts for the pM Class planets. Around a Sun-like primary, for solar composition, this boundary likely occurs at ~0.04-0.05 AU, but we discuss important uncertainties. The difference in the observed day/night contrast between υ And b (pM Class) and HD 189733b (pL Class) is naturally explained in this scenario.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S253: Transiting Planets , May 2008 , pp. 247 - 253
Copyright
Copyright © International Astronomical Union 2009

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