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HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY

Author(s)
Winn, Joshua Nathan; Johnson, John Asher; Albrecht, Simon H.; Howard, Andrew W.; Marcy, Geoffrey W.; Crossfield, Ian J.; Holman, Matthew J.; ... Show more Show less
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Abstract
We show that the exoplanet HAT-P-7b has an extremely tilted orbit, with a true angle of at least 86° with respect to its parent star's equatorial plane, and a strong possibility of retrograde motion. We also report evidence for an additional planet or companion star. The evidence for the unparalleled orbit and the third body is based on precise observations of the star's apparent radial velocity (RV). The anomalous RV due to rotation (the Rossiter-McLaughlin effect) was found to be a blueshift during the first half of the transit and a redshift during the second half, an inversion of the usual pattern, implying that the angle between the sky-projected orbital and stellar angular momentum vectors is 182fdg5 ± 9fdg4. The third body is implicated by excess RV variation of the host star over 2 yr. Some possible explanations for the tilted orbit of HAT-P-7b are a close encounter with another planet, the Kozai effect, and resonant capture by an inward-migrating outer planet.
Date issued
2009-10
URI
http://hdl.handle.net/1721.1/52004
Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
Journal
Astrophysical Journal. Letters
Publisher
American Astronomical Society
Citation
HAT-P-7: A Retrograde or Polar Orbit, and a Third Body Joshua N. Winn, John Asher Johnson, Simon Albrecht, Andrew W. Howard, Geoffrey W. Marcy, Ian J. Crossfield, and Matthew J. Holman 2009 ApJ 703 L99-L103 doi: 10.1088/0004-637X/703/2/L99
Version: Author's final manuscript
ISSN
2041-8213
2041-8205

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