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We report the detection of the primary transit of the extra-solar planet HD80606 b, thanks to photometric and spectroscopic observations performed atObservatoire de Haute-Provence, simultaneously with the CCD camera at the120-cm telescope and the SOPHIE spectrograph at the 193-cm telescope. Weobserved the whole egress of the transit and partially its central part, inboth data sets with the same timings. The ingress occurred before sunset andwas not observed. The full duration of the transit was between 9.5 and 17.2hours. The data allows the planetary radius to be measured (Rp = 0.9 +- 0.1RJup) and other parameters of the system to be refined. Radial velocitymeasurements show the detection of a prograde Rossiter-McLaughlin effect, andprovide a hint for a spin-orbit misalignment. If confirmed, this misalignmentwould corroborate the hypothesis that HD 80606 b owes its unusual orbitalconfiguration to Kozai migration. HD 80606 b is by far the transiting planet onthe longest period detected today. Its unusually small radius reinforces theobserved relationship between the planet radius and the incident flux receivedfrom the star and opens new questions for theory. Orbiting a quite bright star(V=9), it opens opportunities to numerous follow-up studies.

Photometric and spectroscopic detection of the primary transit of the 111-day-period planet HD 80606 b