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arXiv 1003.1301astro-ph.EP
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凌日系外行星WASP -10 b的测光观测

Photometric observation of transiting extrasolar planet WASP - 10b

Tereza Krejcova, Jan Budaj, Viktoria Krushevska

摘要:

Wasp-10 b是一颗非常有趣的凌日系外行星。虽然它的凌日非常深,大约40毫等,但在文献中对其半径的估计有很大的不同。我们提出了新的光度观测四个完整的过境这颗行星。每次凌日都能探测到整个事件,最终的光变曲线由1500多个单独的CCD曝光组成。我们确定了以下系统参数:行星与恒星半径比R_p/R_star=0.168 ± 0.001,恒星半径与半长轴比R_star/a = 0.094 ± 0.001,倾角i=87.3 ± 0.1 °。假设半长轴为0.036 9 +- ^{0.0012}_{0.0014} AU(Christian et al. 2009),我们得到行星半径R_p=1.22 +- 0.05 R_J,恒星半径R_star = 0.75 +- 0.03。误差包括恒星质量和行星半长轴的不确定性。令人惊讶的是,我们对行星半径的估计明显高于Johnson等人(2009)的最新值(约12%)。改进了轨道周期P_orb= 3.092731 ± 1 × 10 ^{-6}天,估计了平均凌日T_D= 0.0974 ± 8 × 10 ^{-4}天。

英文摘要:

Wasp-10b is a very interesting transiting extrasolar planet. Although its transit is very deep, about 40 mmag, there are very different estimates of its radius in the literature. We present new photometric observations of four complete transits of this planet. The whole event was detected for each transit and the final light curve consists of more than 1500 individual CCD exposures. We determine the following system parameters: planet to star radius ratio R_p/R_star=0.168 +- 0.001, star radius to semimajor axis ratio R_star/a = 0.094 +- 0.001 and inclination i=87.3 +- 0.1 deg. Assuming that the semimajor axis is 0.036 9 +- ^{0.0012}_{0.0014} AU (Christian et al. 2009), we obtain the following radius of the planet R_p=1.22 +- 0.05 R_J, and radius of the star R_star = 0.75 +- 0.03. The errors include the uncertainty in the stellar mass and the semimajor axis of the planet. Surprisingly, our estimate of the planet radius is significantly higher (by about 12 percent) than the most recent value of Johnson et al. (2009). We also improve the orbital period P_orb=3.092 731 +- 1x10^{-6} days and estimate the average transit duration T_D=0.097 4 +- 8x10^{-4} days.

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