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|a Winn, Joshua Nathan
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|a Massachusetts Institute of Technology. Department of Physics
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Winn, Joshua Nathan
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|a Narita, Norio
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|a Hirano, Teruyuki
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|a Sato, Bunei
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|a Suto, Yasushi
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|a Turner, Edwin L.
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|a Aoki, Wako
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|a Tamura, Motohide
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|a Yamada, Toru
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|a Improved Measurement of the Rossiter-McLaughlin Effect in the Exoplanetary System HD 17156
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|b Astronomical Society of Japan,
|c 2013-02-06T15:38:18Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/76743
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|a 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: λ = 10[° over .]0 ± 5[° over .]1. This result supersedes the previous claim of λ = 62° ± 25° 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.
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|a Article
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|t Publications of the Astronomical Society of Japan
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