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License: Licence agreement concerning inclusion of doctoral thesis in the Institutional Repository of the University of LeidenDecember 18th, 2008
Recently, Snellen et al. (2008) have presented the ground-based detection of sodium in the transmission spectrum of the extrasolar planet HD 209458b. They showed that under good atmospheric circumstances and with the right observing strategy and analysis methods, ground-based transmission spectroscopy of exoplanets can lead to detections. The aim of this chapter is to show that the sodium absorption also appears in another ground-based data set, that transmission spectroscopy can be done routinely from the ground, and to tar- get, besides sodium, also potassium in the atmosphere of HD 209458b. We carried out ground-based transmission spectroscopy of HD 209458b using the UVES spectrograph at Kueyen (Unit Telescope 2) of the Very Large Telescope at the Paranal Observatory. The obtained spectra have been corrected for instrumental effects which influence the transmis- sion spectroscopy, such as a change of the blaze function of the spectrograph, and a non linearity effect in the CCD. Furt
