Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2009-05-28
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
16 pages, 3 figures, 3 tables, PASJ accepted
Scientific paper
We present an improved measurement of the Rossiter-McLaughlin effect for the exoplanetary system HD 17156, based on radial-velocity data gathered with the Subaru 8.2m telescope throughout the planetary transit of UT 2008 November 7. The data allow for a precise and independent determination of the projected spin-orbit angle of this system: $\lambda = 10.0^{\circ} \pm 5.1^{\circ}$. This result supersedes the previous claim of $\lambda = 62^{\circ} \pm 25^{\circ}$ by Narita et al., which was based on lower-precision data with poor statistics. Thus the stellar spin and planetary orbital axes of the HD 17156 system are likely to be well-aligned, despite the planet's large orbital eccentricity suggesting a history of strong dynamical interactions.
Aoki Wako
Hirano Teruyuki
Narita Norio
Sato Bun'ei
Suto Yasushi
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