Bibcode
Hébrard, G.; Bouchy, F.; Pont, F.; Loeillet, B.; Rabus, M.; Bonfils, X.; Moutou, C.; Boisse, I.; Delfosse, X.; Desort, M.; Eggenberger, A.; Ehrenreich, D.; Forveille, T.; Lagrange, A.-M.; Lovis, C.; Mayor, M.; Pepe, F.; Perrier, C.; Queloz, D.; Santos, N. C.; Ségransan, D.; Udry, S.; Vidal-Madjar, A.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 488, Issue 2, 2008, pp.763-770
Advertised on:
9
2008
Revista
Número de citas
190
Número de citas referidas
173
Descripción
The transiting extrasolar planet XO-3b is remarkable, with a high mass
and eccentric orbit. These unusual characteristics make it interesting
to test whether its orbital plane is parallel to the equator of its host
star, as it is observed for other transiting planets. We performed
radial velocity measurements of XO-3 with the SOPHIE spectrograph at the
1.93 m telescope of Haute-Provence Observatory during a planetary
transit and at other orbital phases. This allowed us to observe the
Rossiter-McLaughlin effect and, together with a new analysis of the
transit light curve, to refine the parameters of the planet. The unusual
shape of the radial velocity anomaly during the transit provides a hint
of a nearly transverse Rossiter-McLaughlin effect. The sky-projected
angle between the planetary orbital axis and the stellar rotation axis
should be λ = 70° ± 15° to be compatible with our
observations. This suggests that some close-in planets might result from
gravitational interaction between planets and/or stars rather than
migration due to interaction with the accretion disk. This surprising
result requires confirmation by additional observations, especially at
lower airmass, to fully exclude the possibility that the signal is due
to systematic effects.
Based on observations collected with the SOPHIE spectrograph on the 1.93
m telescope at Observatoire de Haute-Provence (CNRS), France, by the
SOPHIE Consortium (program 07A.PNP.CONS).
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