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Doppler measurements from Subaru and Keck have revealed radial velocityvariations in the V=8.15, G0IV star HD 149026 consistent with a Saturn-Massplanet in a 2.8766 day orbit. Photometric observations at Fairborn Observatoryhave detected three complete transit events with depths of 0.003 mag at thepredicted times of conjunction. HD 149026 is now the second brightest star witha transiting extrasolar planet. The mass of the star, based on interpolation ofstellar evolutionary models, is 1.3 +/- 0.1 solar masses; together with theDoppler amplitude, K=43.3 m s^-1, we derive a planet mass Msin(i)=0.36 Mjup,and orbital radius of 0.042 AU. HD 149026 is chromospherically inactive andmetal-rich with spectroscopically derived [Fe/H]=+0.36, Teff=6147 K, log g=4.26and vsin(i)=6.0 km s^-1. Based on Teff and the stellar luminosity of 2.72 Lsun,we derive a stellar radius of 1.45 Rsun. Modeling of the three photometrictransits provides an orbital inclination of 85.3 +/- 1.0 degrees and (includingthe uncertainty in the stellar radius) a planet radius of 0.725 +/- 0.05 Rjup.Models for this planet mass and radius suggest the presence of a ~67 Mearthcore composed of elements heavier than hydrogen and helium. This substantialplanet core would be difficult to construct by gravitational instability.Comment: 25 pages, 5 figures, accepted by the Astrophysical Journa

The N2K Consortium. II. A Transiting Hot Saturn around HD 149026 with a Large Dense Core