Journal Article

The exoplanet eccentricity distribution from <i>Kepler</i> planet candidates

Stephen R. Kane, David R. Ciardi, Dawn M. Gelino and Kaspar von Braun

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 1, pages 757-762
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21627.x
The exoplanet eccentricity distribution from Kepler planet candidates

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Abstract

The eccentricity distribution of exoplanets is known from radial velocity surveys to be divergent from circular orbits beyond 0.1 au. This is particularly the case for large planets where the radial velocity technique is most sensitive. The eccentricity of planetary orbits can have a large effect on the transit probability and subsequently the planet yield of transit surveys. The Kepler mission is the first transit survey that probes deep enough into period space to allow this effect to be seen via the variation in transit durations. We use the Kepler planet candidates to show that the eccentricity distribution is consistent with that found from radial velocity surveys to a high degree of confidence. We further show that the mean eccentricity of the Kepler candidates decreases with decreasing planet size indicating that smaller planets are preferentially found in low-eccentricity orbits.

Keywords: techniques: photometric; techniques: radial velocities; planetary systems

Journal Article.  3966 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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