WASP-4b: A 12th magnitude transiting hot Jupiter in the southern hemisphere

D.M. Wilson, M. Gillon, C. Hellier, P.F.L. Maxted, F. Pepe, D. Queloz, D.R. Anderson, A.C. Cameron, B. Smalley, T.A. Lister, S.J. Bentley, A. Blecha, Damian Christian, B. Enoch, C.A. Haswell, L. Hebb, K. Horne, J. Irwin, Yogesh Joshi, S.R. KaneM. Marmier, M. Mayor, N. Parley, Don Pollacco, F. Pont, Robert Ryans, D. Segransan, I. Skillen, R.A. Street, S. Udry, R.G. West, P.J. Wheatley

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)


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(-0.08)(+0.09) M-Jup and a planetary radius of 1.42(-0.04)(+0.07) 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.
Original languageEnglish
Pages (from-to)L113-L116
Number of pages4
JournalAstrophysical Journal Letters
Issue number2 PART 2
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics


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