First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b - INSPIRE

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First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b

Aug, 2009

12 pages

Published in:

Publ.Astron.Soc.Jap. 61 (2009) L35

e-Print:

0908.1673 [astro-ph.EP]

DOI:

10.1093/pasj/61.5.L35

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Abstract: (arXiv)

We present the first evidence of a retrograde orbit of the 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, occured on UT 2008 May 30. Our model shows that the spin-orbit alignment angle of this planet is

\lambda = -132.6^{\circ} (+12.6^{\circ}, -21.5^{\circ})

. The existence of such a retrograde planet had been predicted by recent planetary migration models considering planet-planet scattering processes or the Kozai migration. Our finding provides an important milestone that supports such dynamic migration theories.

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