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We report the detection of the Rossiter-McLaughlin effect for the eccentric,super-Neptune exoplanet HAT-P-11b, based on radial velocity measurements takenwith HDS mounted on the Subaru 8.2m telescope, and simultaneous photometry withthe FTN 2.0m telescope, both located in Hawai'i. The observed radial velocitiesduring a planetary transit of HAT-P-11b show a persistent blue-shift,suggesting a spin-orbit misalignment in the system. The best-fit value for theprojected spin-orbit misalignment angle is $\lambda= 103_{-19}^{+23}$ deg. Ourresult supports the notion that eccentric exoplanetary systems are likely tohave significant spin-orbit misalignment (e.g., HD 80606, WASP-8, WASP-14,WASP-17, and XO-3). This fact suggests that not only hot-Jupiters but alsosuper-Neptunes like HAT-P-11b had once experienced dynamical processes such asplanet-planet scattering or the Kozai migration.

A Possible Tilted Orbit of the Super-Neptune HAT-P-11b