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Author:
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Udalski, A.; Pont, F.; Naef, D.; Melo, C.; Bouchy, F.; Santos, N. C.; Moutou, C.; Díaz, R. F.; Gieren, W.; Gillón, M.; Hoyer, Sergio; Mayor, M.; Mazeh, T.; Minniti, D.; Pietrzynski, G.; Queloz, D.; Ramírez, S.; Ruiz, María Teresa; Tamuz, O.; Udry, S.; Zoccali, Manuela; Kubiak, M.; Szymanski, M. K.; Soszy´nski, I.; Szewczyk, O.; Ulaczyk, K.; Wyrzykowski, Ł.
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Abstract:
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We present results of the photometric campaign for planetary and low-luminosity object transits conducted by the OGLE survey in
2005 season (Campaign #5). About twenty 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 small amplitude of 82 m/sec, varying in phase with
photometric transit ephemeris. Thus, we confirm the planetary nature of the OGLE-TR-211 system. Follow-up precise photometry of
OGLE-TR-211 with VLT/FORS together with radial velocity spectroscopy supplemented with high resolution, high S/N VLT/UVES
spectra allowed us to derive parameters of the planet and host star. OGLE-TR-211b is a hot Jupiter orbiting a F7-8 spectral type dwarf
star with the 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 small densities – objects being a challenge to the current models of
exoplanets. |