Improved Measurement of the Rossiter-McLaughlin Effect in the Exoplanetary System HD 17156
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Winn_Improved measurement.pdf
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Author(s)
Winn, Joshua Nathan
Narita, Norio
Hirano, Teruyuki
Sato, Bunei
Suto, Yasushi
Turner, Edwin L.
Aoki, Wako
Tamura, Motohide
Yamada, Toru
Date Issued
October 2009
Journal
Publications of the Astronomical Society of Japan
Publisher
Astronomical Society of Japan
Citation
Narita, Norio et al. “Improved Measurement of the Rossiter–McLaughlin Effect
in the Exoplanetary System HD 17156.” Publications of the Astronomical Society of Japan 61 (2009): 991–997.
Version
Author's final manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.48550/arXiv.0905.4727
