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arXiv 0908.1705astro-ph.EP
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偏心HAT-P-2行星系的精确恒星、轨道和行星参数

Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system

András Pál, Gáspár Á. Bakos, Guillermo Torres, Robert W. Noyes, Debra A. Fischer, John A. Johnson, Gregory W. Henry, R. Paul Butler, Geoffrey W. Marcy, Andrew W… 展开作者

András Pál, Gáspár Á. Bakos, Guillermo Torres, Robert W. Noyes, Debra A. Fischer, John A. Johnson, Gregory W. Henry, R. Paul Butler, Geoffrey W. Marcy, Andrew W. Howard, Brigitta Sipőcz, David W. Latham, Gilbert A. Esquerdo

摘要:

我们提出了完善的参数太阳系外行星系HAT-P-2(也称为HD 147506),根据新的径向速度和光度数据。HAT-P-2b是一颗凌日的太阳系外行星,轨道偏心。我们提出了一个详细的分析的行星和恒星的参数,产生一致的结果的质量和半径的恒星,更好的约束的轨道偏心率,和完善的行星参数。主恒星的改进参数为M_star = 1.36 +/- 0.04 M_sun和R_star = 1.64 +/- 0.08 R_sun,而行星的质量为M_p = 9.09 +/- 0.24 M_Jup,半径为R_p = 1.16 +/- 0.08 R_Jup。行星的精确凌日时期和周期为E = 2,454,387.49375 +/- 0.00074(BJD)和P = 5.6334729 +/- 0.0000061(天),近星点的轨道偏心率和幅角分别为e = 0.5171 ± 0.0033和omega = 185.22 ± 0.95度。这些轨道要素使我们能够预测日食的时间,准确度约为15分钟。我们还讨论了这种显着的偏心率的影响,包括在过境光变曲线的不对称性的表征。上面给出了一些简单的公式,这些公式又可以用来利用纯粹的测光数据来限制轨道偏心率。这将特别有助于对凌日行星进行非常高精度的星载观测。

英文摘要:

We present refined parameters for the extrasolar planetary system HAT-P-2 (also known as HD 147506), based on new radial velocity and photometric data. HAT-P-2b is a transiting extrasolar planet that exhibits an eccentric orbit. We present a detailed analysis of the planetary and stellar parameters, yielding consistent results for the mass and radius of the star, better constraints on the orbital eccentricity, and refined planetary parameters. The improved parameters for the host star are M_star = 1.36 +/- 0.04 M_sun and R_star = 1.64 +/- 0.08 R_sun, while the planet has a mass of M_p = 9.09 +/- 0.24 M_Jup and radius of R_p = 1.16 +/- 0.08 R_Jup. The refined transit epoch and period for the planet are E = 2,454,387.49375 +/- 0.00074 (BJD) and P = 5.6334729 +/- 0.0000061 (days), and the orbital eccentricity and argument of periastron are e = 0.5171 +/- 0.0033 and omega = 185.22 +/- 0.95 degrees. These orbital elements allow us to predict the timings of secondary eclipses with a reasonable accuracy of ~15 minutes. We also discuss the effects of this significant eccentricity including the characterization of the asymmetry in the transit light curve. Simple formulae are presented for the above, and these, in turn, can be used to constrain the orbital eccentricity using purely photometric data. These will be particularly useful for very high precision, space-borne observations of transiting planets.

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