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We present new observations of a transit of the 111-day-period exoplanetHD80606b. Using the Spitzer Space Telescope and its IRAC camera on thepost-cryogenic mission, we performed a 19-hour-long photometric observation ofHD80606 that covers the full transit of 13-14 January 2010. We complement thisphotometric data by new spectroscopic observations that we simultaneouslyperformed with SOPHIE at Haute-Provence Observatory. This provides radialvelocity measurements of the first half of the transit that was previouslyuncovered with spectroscopy. This new data set allows the parameters of thissingular planetary system to be significantly refined. We obtained aplanet-to-star radius ratio R_p/R_* = 0.1001 +/- 0.0006 that is slightly lowerthan the one measured from previous ground observations. We detected a featurein the Spitzer light curve that could be due to a stellar spot. We also found atransit timing about 20 minutes earlier than the ephemeris prediction; thiscould be caused by actual TTVs due to an additional body in the system or byunderestimated systematic uncertainties. The sky-projected angle between thespin-axis of HD80606 and the normal to the planetary orbital plane is found tobe lambda = 42 +/- 8 degrees thanks to the fit of the Rossiter-McLaughlinanomaly. This allows scenarios with aligned spin-orbit to be definitivelyrejected. Over the twenty planetary systems with measured spin-orbit angles, afew of them are misaligned; this is probably the signature of two differentevolution scenarios for misaligned and aligned systems, depending if theyexperienced or not gravitational interaction with a third body. As in the caseof HD80606b, most of the planetary systems including a massive planet aretilted; this could be the signature of a separate evolution scenario formassive planets in comparison with Jupiter-mass planets.

Observation of the full 12-hour-long transit of the exoplanet HD80606b. Warm-Spitzer photometry and SOPHIE spectroscopy