Bayliss, Daniel; Winn, Joshua; Mardling, Rosemary Anne; Sackett, Penny
We present high-precision radial velocity observations of WASP-17 throughout the transit of its close-in giant planet, using theMIKE spectrograph on the 6.5 mMagellan Telescope at Las Campanas Observatory. By modeling the Rossiter-McLaughlin effect, we find the sky-projected spin-orbit angle to be λ = 167.4±11.2 deg. This independently confirms the previous finding thatWASP-17b is on a retrograde orbit, suggesting it underwent migration via amechanism other than just the gravitational...[Show more]
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