Since the detection of the first extrasolar planets more than two decades ago almost 2100 planets have been found showing an astounding diversity of physical and orbital characteristics.
I will present the work I did during my PhD (at MPIA, in Heidelberg) whose aims were on one side the identification and confirmation of new exoplanets; on the other side the characterization of known transiting exoplanets in order to understand their composition, as this can give insights into planet formation processes.
