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Multiband Transit Light Curve Modeling of WASP-4

Nikolov, N. ; Koppenhoefer, J. ; Lendl, M. ; Henning, T. ; Greiner, J.

In: Proceedings of the International Astronomical Union, 2011, vol. 7, no. S282, p. 141-142

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    Titre
    • Multiband Transit Light Curve Modeling of WASP-4
    Auteur
    • Nikolov, N.. Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany email: nikolov@mpia.de
    • Koppenhoefer, J.. Universitäts-Sternwarte München, Scheinerstr. 1, 81679 Munich, Germany
    • Lendl, M.. Observatoire de Genève, Universitè de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
    • Henning, T.. Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany email: nikolov@mpia.de
    • Greiner, J.. Max Planck Institute for Extraterrestrial Physics, Geissenbachstr., 85748 Garching, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Proceedings of the International Astronomical Union, 2011, vol. 7, no. S282, p. 141-142. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:295808
    Summary
    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