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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559317.0, MPI für Astronomie / Publikationen_mpia
New parameters and transit timing studies for OGLE2-TR-L9 b
Authors:Lendl, M.; Afonso, C.; Koppenhoefer, J.; Nikolov, N.; Henning, Th; Swain, M.; Greiner, J.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Start Page:id.A29
Sequence Number of Article:10.1051/0004-6361/201014940
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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. <BR /> 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. <BR /> 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. <BR /> 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 2 454 492.80008(± 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. Photometric data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via <A href="http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/522/A29">http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/522/A29</A>
Free Keywords:techniques: photometric; planetary systems; planets and satellites: individual: OGLE2-TR-L9 b
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2010A%26A...522A..2... [ID No:1]
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