Radiative acceleration caused by Lyα absorption in an upper atmospheric layer of the atmospheres of HD 209458 b. The acceleration is given in units of the stellar gravitational acceleration. A neutral (dashed, red) and a 90% ionized atmosphere (solid, blue) are compared. The insert shows the Lyα flux at the distance of the planet (thin) and the transmitted flux behind this atmospheric layer (thick line). Only in a neutral atmosphere the radiative acceleration can exceed the stellar gravity.
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