WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere
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Abstract
We report the discovery of WASP-4b, a large transiting gas-giant planet with an orbital period of 1.34 days. This is the first planet to be discovered by the SuperWASP-South observatory and CORALIE collaboration and the first planet orbiting a star brighter than 16th magnitude to be discovered in the southern hemisphere. A simultaneous fit to high-quality light curves and precision radial velocity measurements leads to a planetary mass of 1.22^(+0.09)_(−0.08) M_(Jup) and a planetary radius of 1.42^(+0.07)_(−0.04) R_(Jup). The host star is USNO-B1.0 0479–0948995, a G7 V star of visual magnitude 12.5. As a result of the short orbital period, the predicted surface temperature of the planet is 1761 K, making it an ideal candidate for detections of the secondary eclipse at infrared wavelengths.
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