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High-precision photometry by telescope defocusing - IV. Confirmation of the huge radius of WASP-17b

John K. Southworth,Tobias Cornelius Hinse,Martin Dominik,Xiangsong Fang,Kennet B W Harpsøe,Uffe Gråe Jörgensen,Eamonn J. Kerins,Christine Liebig,Luigi Mancini,Jesper F. Skottfelt,David R. Anderson,Barry S. Smalley,Jeremy Tregloan-Reed,O. Wertz,Khalid A. Alsubai,Valerio Bozza,Sebastiano Calchi Novati,Stefan Dreizler,Shenghong Gu,Markus P G Hundertmark,J. Jessen-Hansen,Noé Kains,Hans Kjeldsen,Mikkel Nørup Lund,Mia Lundkvist,M. Mathiasen,Matthew T. Penny,Sohrab Rahvar,Davide Ricci,Gaetano Scarpetta,Colin D. Snodgrass,Jean Surdej

Monthly Notices of the Royal Astronomical Society（2012）

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Abstract
We present photometric observations of four transits in the WASP-17 planetary system, obtained using telescope defocusing techniques and with scatters reaching 0.5 mmag per point. Our revised orbital period is 4.0 ± 0.6 s longer than previous measurements, a difference of 6.6σ, and does not support the published detections of orbital eccentricity in this system. We model the light curves using the...
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Key words
stars: fundamental parameters,stars: individual: WASP-17,planetary systems
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