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We report the discovery by the WASP transit survey of a highly-irradiated,massive (2.242 +/- 0.080 MJup) planet which transits a bright (V = 10.6),evolved F8 star every 2.9 days. The planet, WASP-71b, is larger than Jupiter(1.46 +/- 0.13 RJup), but less dense (0.71 +/- 0.16 {\rho}Jup). We also reportspectroscopic observations made during transit with the CORALIE spectrograph,which allow us to make a highly-significant detection of theRossiter-McLaughlin effect. We determine the sky-projected angle between thestellar-spin and planetary-orbit axes to be {\lambda} = 20.1 +/- 9.7 degrees,i.e. the system is 'aligned', according to the widely-used alignment criteriathat systems are regarded as misaligned only when {\lambda} is measured to begreater than 10 degrees with 3-{\sigma} confidence. WASP-71, with an effectivetemperature of 6059 +/- 98 K, therefore fits the previously observed patternthat only stars hotter than 6250 K are host to planets in misaligned orbits. Weemphasise, however, that {\lambda} is merely the sky-projected obliquity angle;we are unable to determine whether the stellar-spin and planetary-orbit axesare misaligned along the line-of-sight. With a mass of 1.56 +/- 0.07 Msun,WASP-71 was previously hotter than 6250 K, and therefore might have beensignificantly misaligned in the past. If so, the planetary orbit has beenrealigned, presumably through tidal interactions with the cooling star'sgrowing convective zone.

WASP-71b: a bloated hot Jupiter in a 2.9-day, prograde orbit around an evolved F8 star