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(what is this?)Astrophysics > Earth and Planetary Astrophysics
Title: First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b
Authors:
Norio Narita,
Bun'ei Sato,
Teruyuki Hirano,
Motohide Tamura
(Submitted on 12 Aug 2009 (v1), last revised 27 Aug 2009 (this version, v2))
Abstract: 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, which occurred on UT 2008 May 30. Our best-fit model shows that the spin-orbit alignment angle of this planet is \lambda = -132.6 (+10.5, -16.3) degrees. The existence of such a retrograde planet have 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.
Comments: | PASJ Letters, in press [13 pages] |
Subjects: | Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR) |
Cite as: | arXiv:0908.1673 [astro-ph.EP] |
(or arXiv:0908.1673v2 [astro-ph.EP] for this version) |
Submission history
From: Norio Narita [view email][v1] Wed, 12 Aug 2009 10:45:15 GMT (284kb)
[v2] Thu, 27 Aug 2009 16:31:41 GMT (305kb)
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