High-resolution spectroscopy is a powerful tool to investigate the atmospheres of transiting exoplanets as well as of non-transiting ones. I will briefly review the basics underlying that technique and present the most important results up to now. In the light of the three upcoming Extremely Large Telescopes (ELTs), i.e. the GMT, TMT and E-ELT, I will further present feasibility studies dedicated on the detection of oxygen in the atmospheres of Earth-like planets orbiting M-dwarfs.
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