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

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  • 25 February 2009
Abstract
We report the detection of the primary transit of the extra-solar planet HD 80606 b, thanks to photometric and spectroscopic observations performed at Observatoire de Haute-Provence, simultaneously with the CCD camera at the 120-cm telescope and the SOPHIE spectrograph at the 193-cm telescope. We observed in both datasets the whole egress of the transit and partially its central part, with the same timings. The ingress occurred before sunset and was not observed. The full duration of the transit is between 9.5 and 17.2 hours. The data allows the planetary radius to be measured (Rp = 0.86 +- 0.10 RJup) and other parameters of the system to be refined. Radial velocity measurements show the detection of a prograde Rossiter-McLaughlin effect, and provide a hint for a spin-orbit misalignment. If confirmed, this misalignment would corroborate the hypothesis that HD 80606 b owes its unusual orbital configuration to Kozai migration. HD 80606 b is by far the transiting planet on the longest period detected today. Its radius reinforces the observed relationship between the planet radius and the incident flux received from the star. Orbiting a quite bright star (V=9), it opens opportunities to numerous follow-up studies.

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