Issue |
A&A
Volume 482, Number 1, April IV 2008
|
|
---|---|---|
Page(s) | 299 - 304 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361:20079143 | |
Published online | 25 February 2008 |
OGLE-TR-211 – a new transiting inflated hot Jupiter from the OGLE survey and ESO LP666 spectroscopic follow-up program*
1
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland e-mail: udalski@astrouw.edu.pl
2
The OGLE Team
3
Observatoire de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
4
European Southern Observatory, Casilla 19001, Santiago 19, Chile
5
Institut d'Astrophysique de Paris, 98bis Bd Arago, 75014 Paris, France
6
Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
7
Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, BP 8, Les Trois Lucs, 13376 Marseille Cedex 12, France
8
Instituto de Astronomia y Física del Espacio (CONICET-UBA), Buenos Aires, Argentina
9
Departamento de Fisica, Astronomy Group, Universidad de Concepción, Casilla 160-C, Concepción, Chile
10
Department of Astronomy, Universidad de Chile, Santiago, Chile
11
School of Physics and Astronomy, R. and B. Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
12
Departmento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
13
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
Received:
26
November
2007
Accepted:
4
February
2008
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 1.03±0.20 MJup, while
its radius 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.
Key words: planetary systems / stars: individual: OGLE-TR-211
© ESO, 2008
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