WASP-14b: 7.3 M transiting planet in an eccentric orbit

We report the discovery of a 7.3 MJ exoplanet WASP-14b, one of the most massive transiting exoplanets observed to date. The planet orbits the tenth-magnitude F5V star USNO-B1 11118-0262485 with a period of 2.243752 days and orbital eccentricity e = 0.09. A simultaneous fit of the transit light curve and radial velocity measurements yields a planetary mass of 7.3±0.5 MJ and a radius of 1.28±0.08 RJ. This leads to a mean density of about 4.6 gcm 3 making it densest transiting exoplanets yet found at an orbital period less than 3 days. We estimate this system to be at a distance of 160±20 pc. Spectral analysis of the host star reveals a temperature of 6475±100 K, log g = 4.07 cms 2 and v sin i = 4.9±1.0 kms 1 , and also a high lithium abundance, log N(Li) = 2.84±0.05. The stellar density, effective temperature and rotation rate suggest an age for the system of about 0.5–1.0 Gyr.

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