Institute of Astronomy

Planets in post-common envelope binaries - a second phase of planet formation?

SpeakerTalk DateTalk Series
Stefan Dreizler28 July 2014Across HR 2014 Talks


Among the thousands of confirmed or candidate extrasolar planets the majority is found in solar-type single stars. Planets in wide binaries orbiting one of the binary components, however, have been found since the first exoplanet detections. In contrast, planets orbiting both stars in close binary systems, i.e. circum-binary planets, are a rather recent discovery. On the one hand the Kepler-satellite has provided several planets orbiting MS+MS binaries. Circum-binary planets have also been claimed to be detected in post-common envelope binaries. In those systems, the variation of the eclipse times of the close binary is used as indication for the presence of additional bodies in the system. Since the host binary has undergone a drastic evolution loosing about 75% of its mass, the detection of planets raises the question whether or not these planets survived the common envelope evolution or if they are formed during the common envelope ejection. In the talk I will present the status of our current knowledge about planets in post-common envelope systems and discuss the results in the context of planet and planetary system evolution.