Diploma Thesis
In the course of my diploma thesis at the Max Planck Institute for Astronomy, Heidelberg, I started to develop BASE, a computer program helping astronomers to find extrasolar planets (or exoplanets) and characterise their orbits based on radial-velocity data from spectroscopy of their corresponding host stars.BASE has been tested on synthetic and real data. I have derived the models for both the astrometric and radial-velocity observables and laid the foundation for an extension of the program to such data.