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Delfosse","submitted_at":"2011-01-26T09:10:56Z","abstract_excerpt":"We 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 < 3 M_Jup. 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Eggenberger, A.-M. Lagrange, A. Santerne, A. Vidal-Madjar, C. Lovis, C. Moutou, C. Perrier, D. Ehrenreich, D. Queloz, D. Segransan, F. Bouchy, F. Pepe, G. Hebrard, I. Boisse, L. Arnold, N. C. Santos, R. F. Diaz, S. Udry, T. Forveille, X. Bonfils, X. Delfosse","submitted_at":"2011-01-26T09:10:56Z","abstract_excerpt":"We 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 < 3 M_Jup. 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