Context. A planet transiting in front of the disk of its parent star offers the opportunity to study the compositional properties of its atmosphere by means of the analysis of the stellar light that is filtered by the planetary atmospheric layers. Several studies have so far placed useful constraints on planetary atmospheric properties with this technique, and for the case of HD 209458b even the radial velocity of the planet during the transit event has been reconstructed. This opens up a new range of possibilities.
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Boisse et al. (2011) studied this question.
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