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We describe the discovery of a massive transiting hot Jupiter with a veryshort orbital period (1.30619 d), which we name TrES-3. From spectroscopy ofthe host star GSC 03089-00929, we measure T_eff = 5720 +- 150 K, logg=4.6 +-0.3, and vsini < 2 km/s, and derive a stellar mass of 0.90 +- 0.15 M_sun. Weestimate a planetary mass of 1.92 +- 0.23 M_Jup, based on the sinusoidalvariation of our high-precision radial velocity measurements. This variationhas a period and phase consistent with our transit photometry. Our spectra showno evidence of line bisector variations that would indicate a blended eclipsingbinary star. From detailed modeling of our B and z photometry of the 2.5%-deeptransits, we determine a stellar radius 0.802 +- 0.046 R_sun and a planetaryradius 1.295 +- 0.081 R_Jup. TrES-3 has one of the shortest orbital periods ofthe known transiting exoplanets, facilitating studies of orbital decay and massloss due to evaporation, and making it an excellent target for future studiesof infrared emission and reflected starlight.

TrES-3: A Nearby, Massive, Transiting Hot Jupiter in a 31-Hour Orbit