WASP-4b: A 12th Magnitude Transiting Hot Jupiter in the Southern Hemisphere
- Wilson, D. M.
- Gillon, Michaël
- 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.
- Wheatley, P. J.
DOIAbstract
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[SUP]+0.09[/SUP][SUB]-0.08[/SUB] M[SUB]Jup[/SUB] and a planetary radius of 1.42[SUP]+0.07[/SUP][SUB]-0.04[/SUB] R[SUB]Jup[/SUB]. 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 176...
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