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We report the discovery of a transiting planet with an orbital period of1.36d orbiting the brighter component of the visual binary star BD -07 436. Thehost star, WASP-77A, is a moderately bright G8V star (V=10.3) with ametallicity close to solar ([Fe/H]= 0.0 +- 0.1). The companion star, WASP-77B,is a K-dwarf approximately 2 magnitudes fainter at a separation ofapproximately 3arcsec. The spectrum of WASP-77A shows emission in the cores ofthe Ca II H and K lines indicative of moderate chromospheric activity. The WASPlightcurves show photometric variability with a period of 15.3 days and anamplitude of about 0.3% that is probably due to the magnetic activity of thehost star. We use an analysis of the combined photometric and spectroscopicdata to derive the mass and radius of the planet (1.76+-0.06MJup,1.21+-0.02RJup). The age of WASP-77A estimated from its rotation rate (~1 Gyr)agrees with the age estimated in a similar way for WASP-77B (~0.6 Gyr) but isin poor agreement with the age inferred by comparing its effective temperatureand density to stellar models (~8 Gyr). Follow-up observations of WASP-77 Abwill make a useful contribution to our understanding of the influence ofbinarity and host star activity on the properties of hot Jupiters.

WASP-77 Ab: A transiting hot Jupiter planet in a wide binary system