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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660772.0, MPI für Astronomie / Publikationen_mpia
Multiband transit light curve modeling of WASP-4
Authors:Nikolov, N.; Koppenhoefer, J.; Lendl, M.; Henning, T.; Greiner, J.
Publisher:Cambridge Univ. Press
Date of Publication (YYYY-MM-DD):2012
Title of Proceedings:From Interacting Binaries to Exoplanets: Essential Modeling Tools
Start Page:141
End Page:142
Volume (in Series):282
Name of Conference/Meeting:From Interacting Binaries to Exoplanets: Essential Modeling Tools
Audience:Not Specified
Abstract / Description:We report on the simultaneous g',r',i',z' multiband, high time sampling (18-24s) ground-based photometric observations, which we use to measure the planetary radius and orbital inclination of the extrasolar transiting hot Jupiter WASP-4b. We recorded 987 images during three complete transits with the GROND instrument, mounted on the MPG/ESO-2.2m telescope at La Silla Observatory. Assuming a quadratic law for the stellar limb darkening we derive system parameters by fitting a composite transit light curve over all bandpasses simultaneously. To compute uncertainties of the fitted parameters we employ the Bootstrap Monte Carlo Method. The three central transit times are measured with precision down to 6 s. We find a planetary radius Rp = 1.413 +/- 0.020RJup, an orbital inclination i = 88.°57 +/- 0.45° and calculate new ephemeris, a period P = 1.33823144 +/- 0.00000032 days and reference transit epoch T0 = 2454697.798311 +/- 0.000046 (BJD). The analysis of the new transit mid-times in combination with previous measurements imply a constant orbital period and no compelling evidence for TTVs due to additional bodies in the system.
Free Keywords:planetary systems; stars: individual (WASP-4b)
Comment of the Author/Creator:Date: 2012, April 1, 2012
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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