Journal Article

Improved Measurement of the Rossiter–McLaughlin Effect in the Exoplanetary System HD 17156

Norio Narita, Teruyuki Hirano, Bun’ei Sato, Joshua N. Winn, Yasushi Suto, Edwin L. Turner, Wako Aoki, Motohide Tamura and Toru Yamada

in Publications of the Astronomical Society of Japan

Volume 61, issue 5, pages 991-997
Published in print October 2009 | ISSN: 0004-6264
Published online October 2009 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/61.5.991
Improved Measurement of the Rossiter–McLaughlin Effect in the Exoplanetary System HD 17156

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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: [math] [math] 10[math]0 [math]5[math]1. This result supersedes the previous claim of [math] [math] 62[math][math]25[math] 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.

Keywords: stars: planetary systems: individual (HD 17156); stars: rotation; techniques: radial velocities; techniques: spectroscopic

Journal Article.  4679 words.  Illustrated.

Subjects: Astronomical Instrumentation, Methods, and Techniques ; Stars

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