Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 61, Issue 5, Pages 991-997Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/61.5.991
Keywords
stars: planetary systems: individual (HD 17156); stars: rotation; techniques: radial velocities; techniques: spectroscopic
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Funding
- Japan Society for Promotion of Science (JSPS) [20-8141]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
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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 8.2-m 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 degrees.0 +/- 5 degrees.1. This result supersedes the previous claim of lambda = 62 degrees +/- 25 degrees by Narita et al. (2008, PASJ, 60, L1), 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.
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