2008/01/31 by D. M. Wilson, David M. Wilson, M. Gillon +36 · 3 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Eclipse #Exoplanet #Hot Jupiter #Magnitude (astronomy) #Observatory #Orbital period #Physics #Planet #RADIUS #Radial velocity #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/586735
Added 3 new RV measurements and resultant fit parameters updated. Minor revisions to text. 7 pages incl. 4 figures. Accepted for publication in ApJL
openalex publication_date 2008/02/05 · arxiv created 2008/02/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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 M Jup and a planetary radius of 1.42 + 0.07 −0.04 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.