Jena 2013 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 6: Astrobiologie/Erdnaher Weltraum

EP 6.5: Talk

Wednesday, February 27, 2013, 15:15–15:30, HS 9

Multiplicity studies of exoplanet host stars — •Markus Mugrauer and Christian Ginski — AIU Jena, Jena, Germany

Since several years we conduct surveys in the visible and near infrared spectral range to search for (sub)stellar companions of exoplanet host stars. We carry out seeing limited imaging to detect wide companions of exoplanet host stars with projected separations between about hundred up to thousands of AU. In addition, with diffraction limited AO observations at 8m-class telescopes we are able to identify very close stellar systems with exoplanets with projected separations of only a few tens of AU, which are considered to be the most challenging environments for planet formation, according to theory. Many companions (among them also brown a white dwarfs) could be detected already in our imaging campaigns during the last years. In this talk we will present the most recent results of our ongoing surveys. Furthermore, we will describe our new lucky-imaging multiplicity study of exoplanet host stars carried out at the Calar Alto observatory and present some first results.