Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 683, Issue 1, Pages L59-L62Publisher
IOP PUBLISHING LTD
DOI: 10.1086/591317
Keywords
planetary systems; stars : individual (HD 17156)
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Funding
- NASA [HST-HF-01190.01, NNG05G107]
- TPF Foundation Science Program and under Cooperative Agreement [NNA06CA98A]
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We present high- precision radial velocity observations of HD 17156 during a transit of its eccentric Jovian planet. In these data, we detect the Rossiter- McLaughlin effect, which is an apparent perturbation in the velocity of the star due to the progressive occultation of part of the rotating stellar photosphere by the transiting planet. This system had previously been reported by Narita et al. in 2008 to exhibit a lambda = 62 degrees +/- 25 degrees misalignment of the projected planetary orbital axis and the stellar rotation axis. We model our data, along with the Narita et al. data, and obtain for the combined data set. We thus conclude that the planetary orbital axis is lambda = 9.4 degrees +/- 9.3 degrees for the combined data set. We thus conclude that the planetary orbital axis is actually very well aligned with the stellar rotation axis.
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