Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-18
Mon.Not.Roy.Astron.Soc.376:1296-1300,2007
Astronomy and Astrophysics
Astrophysics
Revised version accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2007.11537.x
We report on photometric follow-up of the recently discovered transiting planet WASP-1b. We observed two transits with the Wise Observatory 1m telescope, and used a variant of the EBOP code together with the Sys-Rem detrending approach to fit the light curve. Assuming a stellar mass of 1.15 M_sun, we derived a planetary radius of R_p = 1.40 +- 0.06 R_J and mass of M_p = 0.87 +- 0.07 M_J. An uncertainty of 15% in the stellar mass results in an additional systematic uncertainty of 5% in the planetary radius and of 10% in planetary mass. Our observations yielded a slightly better ephemeris for the center of the transit: T_c [HJD] = (2454013.3127 +- 0.0004) + N_tr * (2.51996 +- 0.00002). The new planet is an inflated, low-density planet, similar to HAT-P-1b and HD209458b.
Mazeh Tsevi
Shporer Avi
Tamuz Omer
Zucker Shay
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