Revisiting parameters for the WASP-1 planetary system
  We present thirteen new transit light curves for the WASP-1 b exoplanet. Observations were acquired with 0.5 - 1.2-m telescopes between 2007 and 2013. Our homogeneous analysis, which also includes the literature data, results in determining precise system parameters. New values are in agreement with those reported in previous studies. Transit times follow a linear ephemeris with no sign of any transit time variations. This finding is in line with the paradigm that Jupiter-like planets on tight orbits are devoid of close planetary companions. 
G.Maciejewski, J.Ohlert, D.Dimitrov, D.Puchalski,   J.Nedoro\v{s}\v{c}\'ik, M.Va\v{n}ko, C.Marka, S.Baar, St.Raetz, M.Seelig...
astro-ph.EP