A Possible Tilted Orbit of the Super-Neptune HAT-P-11b
Abstract
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 during 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 λ = 103°+22°-18°. 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.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- March 2011
- DOI:
- 10.1093/pasj/63.sp2.S531
- arXiv:
- arXiv:1009.5677
- Bibcode:
- 2011PASJ...63S.531H
- Keywords:
-
- stars: planetary systems: individual (HAT-P-11);
- stars: rotation;
- techniques: photometric;
- techniques: radial velocities;
- techniques: spectroscopic;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- 6 pages, 2 figures, submitted to PASJ