Mechanisms affecting the composition of Hot Jupiters atmospheres

Vivien Parmentier, Tristan Guillot, Adam P. Showman

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Opacities and thus local chemical composition play a key role when characterizing exoplanet atmospheres from observations. When the gas is in chemical equilibrium the chemical abundances depend strongly on the temperature profile. Grey models tend to overestimate the temperatures in the upper atmosphere. We present a new analytical model with a more realistic description of the radiative cooling in the infrared. Mechanisms like quenching and cold traps can drive the upper atmosphere far from its chemical equilibrium. The efficiency of these mechanisms depends on the strength of the vertical mixing. Using 3D global circulation models of HD209458b including passive tracers, we show that, although Hot Jupiter atmospheres are stably stratified, they are strongly mixed by planetary scale circulation patterns. We provide a rough estimate of the effective vertical mixing coefficient in Hot Jupiter atmosphere which can be used in 1D models.

Original languageEnglish (US)
Title of host publicationHot Planets and Cool Stars
StatePublished - 2013
EventConference on Hot Planets and Cool Stars - Garching, Germany
Duration: Nov 12 2012Nov 16 2012

Publication series

NameEPJ Web of Conferences
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X


OtherConference on Hot Planets and Cool Stars

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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