Planetary period vs. eccentricity and mass. This figure shows period plotted against eccentricity for all transiting exoplanets with periods less than 10 days, with circle size indicative of planetary mass. Two-thirds of the 12 planets with M > 2M_J have non-zero eccentricities; those with zero eccentricity include the lowest mass planet in the sample (Kepler-5b) and the most massive (CoRoT-3b). All planetary parameters from the Exoplanet Encyclopedia (http://exoplanet.eu), except for CoRoT-14b.