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Using small automated telescopes in Arizona and Hawaii, the HATNet projecthas detected an object transiting one member of the double star system ADS16402 AB. This system is a pair of G0 main-sequence stars with age about 3 Gyrat a distance of ~139 pc and projected separation of ~1550 AU. The transitsignal has a period of 4.46529 days and depth of 0.015 mag. From follow-upphotometry and spectroscopy, we find that the object is a "hot Jupiter" planetwith mass about 0.53 M_jup and radius ~1.36 R_jup traveling in an orbit withsemimajor axis 0.055 AU and inclination about 85.9 deg, thus transiting thestar at impact parameter 0.74 of the stellar radius. Based on a data setspanning three years, ephemerides for the transit center are: T_C = 2453984.397+ N_tr * 4.46529. The planet, designated HAT-P-1b, appears to be at least aslarge in radius, and smaller in mean density, than any previously-known planet.

HAT‐P‐1b: A Large‐Radius, Low‐Density Exoplanet Transiting One Member of a Stellar Binary