Master’s Thesis Defence by Mathias Boren Søby

Title: Categorizing Stellar Data from the currently known Planet hosting Binary Star Systems

Abstract: Since the first exoplanet around a main-sequence star was discovered in 1995, the number of confirmed exoplanets have exploded since. Over 5000 exoplanets has been discovered since then. Of these, a small number of a few hundred is located around binary host stars. Considering that the majority of stars is in binary systems, it is a wonder that only a small part of exoplanets has been discovered around them.

In this thesis I will try to figure out why such a small number is around binary host stars, and in that connection create a catalog of the currently known binary star hosts of the S-type system. The catalog will include multiple different values pertaining to the host stars, categorized in a sequence of positional, photometric and observational data. I will try to compare various observational values with known rela- tions, to confirm the validity of the data.

I complete a catalog for 226 binary host stars, collecting the data from various sources, this being articles and catalogs. The catalog contain 21 columns of data, this being coordinates, distance, magnitudes and stellar parameters. I create an HR-diagram of the stars, and conclude from there that at the current mo- ment nothing discerns the binary host stars from other host stars. With statistical analysis of mass-radius and mass-luminosity relations I can conclude that some of the error measurements is overestimated, but further analysis can provide better results.