Volume 522, November 2010
|Number of page(s)||6|
|Section||Planets and planetary systems|
|Published online||28 October 2010|
New parameters and transit timing studies for OGLE2-TR-L9 b*
Max Planck Institute for Astronomy,
2 Universitäts-Sternwarte München, Scheinerstr. 1, 81679 Munich, Germany
3 Institut für Astronomie, Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
4 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA
5 Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290 Versoix, Switzerland
6 Max Planck Institute for Extraterrestrial Physics, Giessenbachstr., 85748 Garching, Germany
Accepted: 22 June 2010
Context. Repeated observations of exoplanet transits allow us to refine the planetary parameters and probe them for any time dependent variations. In particular deviations of the period from a strictly linear ephemeris, transit timing variations (TTVs), can indicate the presence of additional bodies in the planetary system.
Aims. Our goal was to reexamine the largely unstudied OGLE2-TR-L9 system with high cadence, multi-color photometry in order to refine the planetary parameters and probe the system for TTVs.
Methods. We observed five full transits of OGLE2-TR-L9 with the GROND instrument at the ESO/MPG 2.2 m telescope at La Silla Observatory. GROND is a multichannel imager that allowed us to gather simultaneous light curves in the g′, r′, i′, and z′ filters.
Results. From our analysis we find that the semi-major axis and the inclination differ from the previously published values. With the newly observed transits, we were able to refine the ephemeris to 2454492.80008(±0.00014) + 2.48553417(±6.4 × 10-7)E. The newly derived parameters are a = 0.0418 ± 0.0015 AU, rp = 1.67 ± 0.05 Rj, and inc = 82.47° ± 0.12, differing significantly in a and inc from the previously published values. Within our data, we find indications for TTVs.
Key words: techniques: photometric / planetary systems / planets and satellites: individual: OGLE2-TR-L9 b
Photometric data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/522/A29
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.