Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 675, Issue 2, Pages L113-L116Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/586735
Keywords
planetary systems; stars : individual (WASP-4)
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Funding
- STFC [PP/D000890/1, PP/D000963/1, PP/D000955/1, PP/F000065/1, PP/F000057/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/F000057/1, PP/F000065/1, PP/D000890/1, PP/D000955/1, PP/D000963/1] Funding Source: researchfish
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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(-0.08)(+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.
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