WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
astro-ph
/ Authors
D. M. Wilson, M. Gillon, C. Hellier, P. F. L. Maxted, F. Pepe, D. Queloz, D. R. Anderson, A. Collier Cameron, B. Smalley, T. A. Lister
and 22 more authors
S. J. Bentley, A. Blecha, D. J. Christian, B. Enoch, C. A. Haswell, L. Hebb, K. Horne, J. Irwin, Y. C. Joshi, S. R. Kane, M. Marmier, M. Mayor, N. Parley, D. Pollacco, F. Pont, R. Ryans, D. Segransan, I. Skillen, R. A. Street, S. Udry, R. G. West, P. J. Wheatley
/ 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 lightcurves and precision radial-velocity measurements leads to a planetary mass of 1.22 +/- 0.1 MJup and a planetary radius of 1.42 +/- 0.08 RJup. The host star is USNO-B1.0 0479-0948995, a G7V star of visual magnitude 12.5. As a result of the short orbital period, the predicted surface temperature of the planet is 1776 K, making it an ideal candidate for detections of the secondary eclipse at infrared wavelengths.