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arXiv 0909.4170astro-ph.EP
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系外行星系统HAT-P-3七个RISE光变曲线的transit定时分析

A transit timing analysis of seven RISE light curves of the exoplanet system HAT-P-3

N. P. Gibson, D. Pollacco, S. Barros, C. Benn, D. Christian, M. Hrudková, Y. C. Joshi, F. P. Keenan, E. K. Simpson, I. Skillen, I. A. Steele, I. Todd

摘要:

我们提出了七个光变曲线的系外行星系统HAT-P-3,作为过境计时计划的一部分,使用上升仪器的利物浦望远镜。使用马尔可夫链蒙特卡罗算法来更新系统的参数的光变曲线进行分析。测得倾角i = 86.75^{+0.22}-{-0.21}度,行星-恒星半径比R_p/R_star = 0.1098^{+0.0010}-{-0.0012},恒星半径R_star = 0.834^{+0.018}-{-0.026} R_sun。与以前的结果一致,但在精度上有显著提高。还确定了每个光变曲线的中心渡越时间和不确定性,并使用残差置换算法作为对误差的独立检查。发现凌时与线性星历一致,并计算出新的星历T_c(0)= 2454856.70118 +- 0.00018 HJD和P = 2.899738 +- 0.000007天。模型的定时残差拟合到测量的定时残差放置一个假设的扰动行星作为周期比的函数的质量上限。这些结果表明,我们已经探测到行星的质量低至0.33 M_地球和1.81 M_地球的内部和外部2:1共振,分别假设行星最初是在圆形轨道。

英文摘要:

We present seven light curves of the exoplanet system HAT-P-3, taken as part of a transit timing program using the RISE instrument on the Liverpool Telescope. The light curves are analysed using a Markov-Chain Monte-Carlo algorithm to update the parameters of the system. The inclination is found to be i = 86.75^{+0.22}_{-0.21} deg, the planet-star radius ratio to be R_p/R_star = 0.1098^{+0.0010}_{-0.0012}, and the stellar radius to be R_star = 0.834^{+0.018}_{-0.026} R_sun, consistent with previous results but with a significant improvement in the precision. Central transit times and uncertainties for each light curve are also determined, and a residual permutation algorithm used as an independent check on the errors. The transit times are found to be consistent with a linear ephemeris, and a new ephemeris is calculated as T_c(0) = 2454856.70118 +- 0.00018 HJD and P = 2.899738 +- 0.000007 days. Model timing residuals are fitted to the measured timing residuals to place upper mass limits for a hypothetical perturbing planet as a function of the period ratio. These show that we have probed for planets with masses as low as 0.33 M_earth and 1.81 M_earth in the interior and exterior 2:1 resonances, respectively, assuming the planets are initially in circular orbits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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