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

作者：Hirano Teruyuki^*; Narita Norio; Shporer Avi; Sato Bun'ei; Aoki Wako; Tamura Motohide

来源：Publications of the Astronomical Society of Japan, 2011, 63: S531-S536.

• stars: planetary systems: individual (HAT-P-11)
• stars: rotation
• techniques: photometric
• techniques: radial velocities
• techniques: spectroscopic

We report on the detection of the Rossiter-McLaughlin effect for the eccentric, super-Neptune exoplanet HAT-P-11b, based on radial-velocity measurements taken with the High Dispersion Spectrograph mounted on the Subaru 8.2 m telescope, and simultaneous photometry with the LCOGT 2.0 m Faulkes Telescope North, both located in Hawaii. The observed radial velocities (luring 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 the projected spin-orbit misalignment angle is lambda = 103 degrees(+22 degrees)(-18 degrees) This fact suggests that not only hot-Jupiters, but also super-Neptunes like HAT-P-11b had once experienced dynamical processes, such as planet-planet scattering or Kozai migration.

• 出版日期2011
• 单位中国科学院国家天文台