Institute of Astronomy

Planet Formation in Binary Systems

SpeakerTalk DateTalk Series
Rebecca Martin26 July 2016Binary Stars Talks


About half of observed exoplanets are estimated to be in binary systems. Thus, understanding planet formation and evolution in binaries is essential for explaining observed mexoplanet properties.   I will show how planet formation in binaries may be significantly different to planet formation around a single star because of the additional torque from the binary companion. Observations of protoplanetary discs show that they can be highly misaligned to the binary orbital plane.   A highly misaligned disc undergoes global Kozai-Lidov oscillations where the disc exchanges eccentricity and inclination. In a disc that is self-gravitating these oscillations may lead to planet formation through fragmentation. Planet-disc interactions in a mildly inclined disc around one component of a binary can lead to the formation of highly eccentric and highly inclined planets.