Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 61, Issue 5, Pages L35-L40Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/61.5.L35
Keywords
stars: planetary systems: individual (HAT-P-7); stars: rotation; techniques: radial velocities; techniques: spectroscopic
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Funding
- Japan Society for Promotion of Science (JSPS) [PD:20-8141]
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We present the first evidence of a retrograde orbit of a transiting exoplanet HAT-P-7b. The discovery is based on a measurement of the Rossiter-McLaughlin effect with the Subaru HDS during a transit of HAT-P-7b, which occurred on 2008 May 30 UT. Our best-fit model shows that the spin-orbit alignment angle of this planet is lambda = -132 degrees.6(-16 degrees.3)(+10 degrees.5). The existence of such a retrograde planet has been predicted by recent planetary migration models that consider planet-planet scattering processes, or Kozai migration. Our finding provides an important milestone that supports such dynamic migration theories.
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