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. Collier Cameron, B. Smalley, T. A. Lister, S. J. Bentley, A. Blecha, D. J. Christian, B. Enoch, C. A. Haswell, L. Hebb, K. Horne, J. Irwin, Y. C. Joshi, S. R. KaneM. 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

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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+0.09 -0.08 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.

Original languageEnglish
JournalAstrophysical Journal
Issue number2 PART 2
Publication statusPublished - 1 Dec 2008
Externally publishedYes



  • Planetary systems
  • Stars: individual (WASP-4)

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Wilson, D. M., Gillon, M., Hellier, C., Maxted, P. F. L., Pepe, F., Queloz, D., Anderson, D. R., Cameron, A. C., 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., ... Wheatley, P. J. (2008). WASP-4b: A 12th magnitude transiting hot jupiter in the southern hemisphere. Astrophysical Journal, 675(2 PART 2). https://doi.org/10.1086/586735