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Roell T.,University Observatory Jena | Neuhauser R.,University Observatory Jena | Seifahrt A.,University Observatory Jena | Seifahrt A.,University of California at Davis | And 2 more authors.
Astronomy and Astrophysics | Year: 2012

Aims. Analyzing exoplanets detected by radial velocity (RV) or transit observations, we determine the multiplicity of exoplanet host stars in order to study the influence of a stellar companion on the properties of planet candidates. Methods. Matching the host stars of exoplanet candidates detected by radial velocity or transit observations with online multiplicity catalogs in addition to a literature search, 57 exoplanet host stars are identified having a stellar companion. Results. The resulting multiplicity rate of at least 12% for exoplanet host stars is about four times smaller than the multiplicity of solar like stars in general. The mass and the number of planets in stellar multiple systems depend on the separation between their host star and its nearest stellar companion, e.g. the planetary mass decreases with an increasing stellar separation. We present an updated overview of exoplanet candidates in stellar multiple systems, including 15 new systems (compared to the latest summary from 2009). © 2012 ESO.

Raetz S.,University Observatory Jena | Mugrauer M.,University Observatory Jena | Schmidt T.O.B.,University Observatory Jena | Roell T.,University Observatory Jena | And 14 more authors.
EPJ Web of Conferences | Year: 2011

We report on observations of transit events of the transiting planets XO-1b, TrES-1 and TrES-2 with a 25 cm telescope of the University Observatory Jena. With the help of all available transit times from literature including our own photometry our measurements allowed us to refine the estimate of the orbital period of all three transiting planets observed by us. © Owned by the authors, published by EDP Sciences, 2011.

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