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

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 spect...

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Detalles Bibliográficos
Autores principales: Udalski, A., Pont, F., Naef, D., Melo, C., Bouchy, F., Santos, C., Moutou, C., Díaz, F., Gieren, W., Gillon, M., Hoyer, S., Mayor, M., Mazeh, T., Minniti, D., Pietrzyński, G., Queloz, D., Ramirez, S., Ruiz, M.T., Shporer, A., Tamuz, O., Udry, S., Zoccali, M., Kubiak, M., Szymański, K., Soszyński, I., Szewczyk, O., Ulaczyk, K., Wyrzykowski, Ł.
Formato: JOUR
Materias:
Planetary systems
Stars: individual: OGLE-TR-211
Planetary surface analysis
Spectrographs
Radial velocity
Stars
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v482_n1_p299_Udalski
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario: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/N VLT/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 1.030.20 , while its radius . 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. © 2008 ESO.

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