planetary systems

WASP-5b: a dense, very hot Jupiter transiting a 12th-mag Southern-hemisphere star

We report the discovery of WASP-5b, a Jupiter-mass planet orbiting a 12th-mag G-type star in the Southern hemisphere. The 1.6-d orbital period places WASP-5b in the class of very hot Jupiters and leads to a predicted equilibrium temperature of 1750K. WASP-5b is the densest of any known Jovian-mass planet, being a factor of 7 denser than TrES-4, which is subject to similar stellar insolation, and a factor of 3 denser than WASP-4b, which has a similar orbital period.
Monthly Notices of the Royal Astronomical Society: Letters, Volume 387, Issue 1, pp. L4-L7

Parameters and Predictions for the Long-Period Transiting Planet HD 17156b

We report high-cadence time series photometry of the recently discovered transiting exoplanet system HD 17156, spanning the time of transit on UT 2007 October 1, from three separate observatories. We present a joint analysis of our photometry, previously published radial velocity measurements, and times of transit center for three additional events. Adopting the spectroscopically determined values and uncertainties for the stellar mass and radius, we estimate a planet radius of Rp=1.01+/-0.09 RJup and an inclination of i=86.5+1.1-0.7 deg.
The Astrophysical Journal, Volume 681, Issue 1, pp. 636-643

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