Maps of the spectral transmittance of clear atmosphere models of HD 209458 b as a function of wavelength and altitude. The parameters are Tday = 1800 K, Tnight = 1000 K, and Piso = 10 mb, which are representative of the real planet (Parmentier et al. 2013). A low transmittance – blue shades – is representative of opaque regions deep down and a transmittance near unity – yellow – is representative of the transparent upper atmosphere. Left panel: case with a uniform upper temperature of 1400 K. Middle panel: case with a β = 15° transition region between the day and night sides. The higher opacity of the middle case is further highlighted by the right panel that shows the map of the transmittance difference between the left and the middle cases. The altitude of the top of the isothermal region is ~ 3800 km.
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