Photometric follow-up of the transiting planet WASP-1b

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Abstract
We report on photometric follow-up of the recently discovered transiting planet WASP-1b. We observed two transits with the Wise Observatory 1-m telescope, and used a variant of the Eclipsing Binary Orbit Program (ebop) code together with the Sys-Rem detrending approach to fit the light curve. Assuming a stellar mass of 1.15 M⊙, we derived a planetary radius of Rp= 1.40 ± 0.06RJ and mass of Mp= 0.87 ± 0.07MJ. An uncertainty of 15 per cent in the stellar mass results in an additional systematic uncertainty of 5 per cent in the planetary radius and of 10 per cent in planetary mass. Our observations yielded a slightly better ephemeris for the centre of the transit: Tc [HJD]= (245 4013.3127 ± 0.0004) +Ntr(2.51996 ± 0.00002). The new planet is an inflated, low-density planet, similar to HAT-P-1b and HD 209458b.