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The transiting system GJ1214: High-precision defocused transit observations and a search for evidence of transit timing variation
, Article Astronomy and Astrophysics ; Volume 549 , 2012 ; 00046361 (ISSN) ; Hardis, S ; Hinse, T. C ; Jørgensen, U. G ; Mancini, L ; Southworth, J ; Alsubai, K. A ; Bozza, V ; Browne, P ; Burgdorf, M. J ; Calchi Novati, S ; Dodds, P ; Dominik, M ; Fang, X. S ; Finet, F ; Gerner, T ; Gu, S. H ; Hundertmark, M ; Jessen Hansen, J ; Kains, N ; Kerins, E ; Kjeldsen, H ; Liebig, C ; Lund, M. N ; Lundkvist, M ; Mathiasen, M ; Nesvorný, D ; Nikolov, N ; Penny, M. T ; Proft, S ; Rahvar, S ; Ricci, D ; Sahu, K. C ; Scarpetta, G ; Schäfer, S ; Schönebeck, F ; Snodgrass, C ; Skottfelt, J ; Surdej, J ; Tregloan Reed, J ; Wertz, O ; Sharif University of Technology
2012
Abstract
Aims. We present 11 high-precision photometric transitobservations of the transiting super-Earth planet GJ≠1214≠b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach. Methods. The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1 mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods. Results. The observations are used to determine the photometric parameters and the physical properties...