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We present measurements of the spin-orbit alignment angle, lambda, for thehot Jupiter systems WASP-32, WASP-38, and HAT-P-27/WASP-40, based on dataobtained using the HARPS spectrograph. We analyse the Rossiter-McLaughlineffect for all three systems, and also carry out Doppler tomography for WASP-32and WASP-38. We find that WASP-32 (T_eff = 6140 +90 -100 K) is aligned, with analignment angle of lambda = 10.5 +6.4 -6.5 degrees obtained through tomography,and that WASP-38 (T_eff = 6180 +40 -60 K) is also aligned, with tomographicanalysis yielding lambda = 7.5 +4.7 -6.1 degrees. This latter result providesan order of magnitude improvement in the uncertainty in lambda compared to theprevious analysis of Simpson et al. (2011). We are only able to looselyconstrain the angle for HAT-P-27/WASP-40 (T_eff = 5190 +160 -170 K) to lambda =24.2 +76.0 -44.5 degrees, owing to the poor signal-to-noise of our data. Weconsider this result a non-detection under a slightly updated version of thealignment test of Brown et al. (2012). We place our results in the context ofthe full sample of spin-orbit alignment measurements, finding that they providefurther support for previously established trends.

Analysis of spin-orbit alignment in the WASP-32, WASP-38, and HAT-P-27/WASP-40 systems