Journal
ASTRONOMY & ASTROPHYSICS
Volume 482, Issue 1, Pages 299-304Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20079143
Keywords
planetary systems; stars : individual : OGLE-TR-211
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Funding
- Polish MNiSW [N20303032/4275]
- Chilean FONDAP Center of Astrophysics [15010003]
- Fundacao para a Ciencia e a Tecnologia, Portugal [POCI/CTE-AST/56453/2004]
- EC
- FCT [POCI2010]
- Fundação para a Ciência e a Tecnologia [POCI/CTE-AST/56453/2004] Funding Source: FCT
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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 M-Jup, while its radius 1.36(-0.09)(+0.18) R-Jup. 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.
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