Photometric and spectroscopic detection of the primary transit of the 111-day-period planet HD 80 606 b
Abstract
We report the detection of the primary transit of the extra-solar planet HD 80 606 b, thanks to photometric and spectroscopic observations performed at the Observatoire de Haute-Provence, simultaneously with the CCD camera at the 120-cm telescope and the SOPHIE spectrograph on the 193-cm telescope. We observed the whole egress of the transit and partially its central part, in both datasets with the same timings. The ingress occurred before sunset so was not observed. The full duration of the transit was between 9.5 and 17.2 h. The data allows the planetary radius to be measured (Rp = 0.9 ± 0.10 {R}_Jup) 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 of a spin-orbit misalignment. If confirmed, this misalignment would corroborate the hypothesis that HD 80 606 b owes its unusual orbital configuration to Kozai migration. HD 80 606 b is by far the transiting planet on the longest period detected today. Its unusually small radius reinforces the observed relationship between the planet radius and the incident flux received from the star and opens new questions for theory. Orbiting a bright star (V=9), it opens opportunities for numerous follow-up studies.
Based on observations made with the 1.20-m and 1.93-m telescopes at the Observatoire de Haute-Provence (CNRS), France, by the SOPHIE consortium (program 07A.PNP.CONS). Radial velocity and photometry tables are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/498/L5- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 2009
- DOI:
- 10.1051/0004-6361/200911954
- arXiv:
- arXiv:0902.4457
- Bibcode:
- 2009A&A...498L...5M
- Keywords:
-
- stars: planetary systems;
- techniques: photometric;
- techniques: radial velocities;
- stars: individual: HD 80 606;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- revised after acceptance