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High-precision photometry by telescope defocussing - II. the transiting planetary system WASP-4
, Article Monthly Notices of the Royal Astronomical Society ; Volume 399, Issue 1 , 2009 , Pages 287-294 ; 00358711 (ISSN) ; Hinse, T. C ; Burgdorf, M. J ; Dominik, M ; Hornstrup, A ; Jørgensen, U. G ; Liebig, C ; Ricci, D ; Thone, C. C ; Anguita, T ; Bozza, V ; Novati, S. C ; Harpsoe, K ; Mancini, L ; Masi, G ; Mathiasen, M ; Rahvar, S ; Scarpetta, G ; Snodgrass, C ; Surdej, J ; Zub, M ; Sharif University of Technology
2009
Abstract
We present and analyse light curves of four transits of the Southern hemisphere extrasolar planetary system WASP-4, obtained with a telescope defocused so the radius of each point spread function was 17 arcsec (44 pixels). This approach minimizes both random and systematic errors, allowing us to achieve scatters of between 0.60 and 0.88 mmag per observation over complete transit events. The light curves are augmented by published observations and analysed using the jktebop code. The results of this process are combined with theoretical stellar model predictions to derive the physical properties of the WASP-4 system. We find that the mass and radius of the planet are M b = 1.289 +0.090 -0.090...