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Centro de Astrofísica da Universidade do Porto

OGLE-TR-211 – a new transiting inflated hot Jupiter from the OGLE survey and ESO LP666 spectroscopic follow-up program

A. Udalski, F. Pont, D. Naef, C. Melo, F. Bouchy, N. C. Santos, C. Moutou, R. F. Díaz, W. Gieren, M. Gillon, S. Hoyer, M. Mayor, T. Mazeh, D. Minniti, G. Pietrzynski, D. Queloz, S. Ramírez, M. T. Ruiz, A. Shporer, O. Tamuz, S. Udry, M. Zoccali, M. Kubiak, M. K. Szymanski, I. Soszynski, O. Szewczyk, K. Ulaczyk, L. Wyrzykowski

We present results of the photometric campaign for planetary and low-luminosity object transits conducted by the OGLE survey in the 2005 season (Campaign #5). About twenty of the most promising candidates discovered in these data were subsequently verified spectroscopically with the VLT/FLAMES spectrograph. One of the candidates, OGLE-TR-211, reveals clear changes of radial velocity with a small amplitude of 82 m/s, varying in phase with photometric transit ephemeris. Further analysis confirms the planetary nature of this system. Follow-up precise photometry of OGLE-TR-211 with VLT/FORS, together with radial velocity spectroscopy, supplemented with high-resolution, high S/NVLT/UVES spectra allowed us to derive parameters of the planet and host star. OGLE-TR-211b is a hot Jupiter orbiting an F7-8 spectral type dwarf star with a period of 3.68 days. The mass of the planet is equal to 1.03 ± 0.20 MJup, while its radius 1.36 +0.18 −0.09 RJup. The radius is about 20% larger than the typical radius of hot Jupiters of similar mass. OGLE-TR-211b is, then, another example of inflated hot Jupiters – a small group of seven exoplanets with large radii and unusually low densities – objects that are a challenge to the current models of exoplanets.

Astronomy and Astrophysics
Volume 482, Page 299
April 2008

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