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Fig. 1

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Optical depth vs. atmospheric temperature in units of the effective temperature. A numerical solution obtained from Fortney et al. (2008) (thick black line) is compared to the semi-grey analytical solutions of Guillot (2010) for values of the greenhouse factor ranging from 0.01 to 100 (black to red lines). Low values of γv are redder. We used , Tirr = 1250K corresponding to the dayside average profile of a planet at 0.05  au from a sun-like star, and accounting for the albedo obtained in the numerical model. The internal temperature is Tint = 125  K and gravity 25ms-2. The effective temperature of the studied slice of atmosphere1 is defined by . For the numerical solution, the relation between pressure and optical depth was calculated using Rosseland mean opacities; TiO and VO opacities were not included.

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