Two Classes of Hot Jupiter Atmospheres

Details Two Classes of Hot Jupiter Atmospheres Two Classes of Hot Jupiter Atmospheres

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iaus..253..247f&link_type=abstract

Transiting Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 253, p. 247-253

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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