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We report on spectroscopic and photometric observations through transits ofthe exoplanets WASP-22b and WASP-26b, intended to determine the systems'spin-orbit angles. We combine these data with existing data to refine thesystem parameters. We measure a sky-projected spin-orbit angle of 22 +/- 16 degfor WASP-22b, showing the planet's orbit to be prograde and, perhaps, slightlymisaligned. We do not detect the Rossiter-McLaughlin effect of WASP-26b due toits low amplitude and observation noise. We place 3-sigma upper limits onorbital eccentricity of 0.063 for WASP-22b and 0.050 for WASP-26b. Afterrefining the drift in the systemic velocity of WASP-22 found by Maxted et al.(2010, AJ, 140, 2007) we find the third body in the system to have aminimum-mass of 5.3 +/- 0.3 Mjup (a3/5 AU)^2, where a3 is the orbital distanceof the third body.

Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26