WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere

Wilson, D. M.; Gillon, M.; Hellier, C.; Maxted, P. F. L.; Pepe, F.; Queloz, D.; Anderson, D. R.; Collier-Cameron, A.; Smalley, B.; Lister, T. A.; Bentley, S. J.; Blecha, A.; Christian, D. J.; Enoch, B.; Haswell, C. A.; Hebb, L.; Horne, K.; Irwin, J.; Joshi, Y. C.; Kane, S. R.; Marmier, M.; Mayor, M.; Parley, N.; Pollacco, D.; Pont, F.; Ryans, R.; Segransan, D.; Skillen, I.; Street, R. A.; Udry, S.; West, R. G. and Wheatley, P. J. (2008). WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere. Astrophysical Journal Letters, 675, article no. L113.

DOI: https://doi.org/10.1086/586735


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 MJup and a planetary radius of 1.42+0.07-0.04 RJup. 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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