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The retrograde orbit of the HAT-P-6b exoplanet

By G. Hebrard, D. Ehrenreich, F. Bouchy, X. Delfosse, C. Moutou, L. Arnold, I. Boisse, X. Bonfils, R. F. Diaz, A. Eggenberger, T. Forveille, A. -M. Lagrange, C. Lovis, F. Pepe, C. Perrier, D. Queloz, A. Santerne, N. C. Santos, D. Segransan, S. Udry and A. Vidal-Madjar


4 pages, 4 figures, accepted for publication in A&A LettersWe observed with the SOPHIE spectrograph (OHP, France) the transit of the HAT-P-6b exoplanet across its host star. The resulting stellar radial velocities display the Rossiter-McLaughlin anomaly and reveal a retrograde orbit: the planetary orbital spin and the stellar rotational spin point towards approximately opposite directions. A fit to the anomaly measures a sky-projected angle lambda = 166 +/- 10 degrees between these two spin axes. All seven known retrograde planets are hot jupiters with masses M_p 4 M_Jup) are prograde but misaligned. Different mechanisms may therefore be responsible for planetary obliquities above and below ~3.5 M_Jup

Topics: [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Publisher: HAL CCSD
Year: 2011
OAI identifier: oai:HAL:hal-00662755v1
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