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Physical properties of the transiting planetary system TrES-3

机译：过渡行星系统TrES-3的物理性质

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摘要

We present four new transits of the planetary system TrES-3 observed between 2009 May and 2010 June. Among these, the third transit by itself indicates possible evidence for brightness disturbance, which might be a result of the planet blocking a cool starspot on the stellar surface. A total of 109 transit times, including our measurements, were used to determine the improved ephemeris with a transit epoch of 2454185.910944?0.000072 HJED and an orbital period of 1.30618700?0.00000015d. We analyzed the transit light curves using the JKTEBOP code and adopting the quadratic limb-darkening law. In order to derive the physical properties of the TrES-3 system, the transit parameters were combined with the empirical relations from eclipsing binary stars and stellar evolutionary models. The stellar mass and radius obtained from a calibration using TA, logφA, and [Fe=H] are consistent with those from an isochrone analysis. We found that the exoplanet TrES-3b has a mass of 1.93±0. 07M_(Jup), a radius of 1.30±0.04R_(Jup), a surface gravity of log gb = 3.45±0.02, a density of 0.82±0.06 φJup, and an equilibrium temperature of 1641±23 K. The results are in good agreement with theoretical models for gas giant planets.
机译：我们介绍了从2009年5月到2010年6月观察到的TrES-3行星系统的四个新过境。其中，第三次飞行本身表明存在亮度扰动的可能证据，这可能是行星遮挡了恒星表面上一个凉爽的星点的结果。包括我们的测量结果在内的总共109个渡越时间用于确定改进的星历，其过渡时期为2454185.910944？0.000072 HJED，轨道周期为1.30618700？0.00000015d。我们使用JKTEBOP代码并采用二次肢变黑定律分析了过渡光曲线。为了推导TrES-3系统的物理特性，将过渡参数与日食双星和恒星演化模型的经验关系相结合。通过使用TA，logφA和[Fe = H]进行校准获得的恒星质量和半径与通过等时线分析获得的恒星质量和半径一致。我们发现系外行星TrES-3b的质量为1.93±0。 07M_（Jup），半径1.30±0.04R_（Jup），log gb = 3.45±0.02的表面重力，0.82±0.06ΦJup的密度以及1641±23 K的平衡温度。结果良好与天然气巨行星的理论模型一致。

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