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arXiv 1111.5432astro-ph.EP
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HAT-P-13行星系的精细物理性质

Refined physical properties of the HAT-P-13 planetary system

John Southworth, I. Bruni, L. Mancini, J. Gregorio

摘要:

本文用离焦望远镜观测了行星系HAT-P-13的四次凌日。我们分析这些,再加上9个数据集从文献中,以确定系统的物理特性。该恒星的质量和半径分别为M_A = 1.320 +/- 0.048 +/- 0.039 Msun和R_A = 1.756 +/- 0.043 +/- 0.017 Rsun(统计和系统误差条)。我们发现凌日行星的等效量为M_b = 0.906 +/- 0.024 +/- 0.018 Mjup,R_b = 1.487 +/- 0.038 +/- 0.015 Rjup,平衡温度为1725 +/- 31 K。与以前的结果相比,这些结果是基于更稀疏的光度数据,我们发现恒星更大,更进化,行星更大,更热,更稀薄。这颗行星的性质与辐照过的气体巨星的标准模型不匹配。它的大半径异常与最热的行星是最膨胀的观测结果一致,但与母星[Fe/H]成反比的建议不一致。我们集合所有可用的凌日中点时间,并确定一个新的线性星历。以前的研究结果的过境时间变化的HAT-P-13系统不同意这些测量,可以归因于小数字的统计。

英文摘要:

We present photometry of four transits of the planetary system HAT-P-13, obtained using defocussed telescopes. We analyse these, plus nine datasets from the literature, in order to determine the physical properties of the system. The mass and radius of the star are M_A = 1.320 +/- 0.048 +/- 0.039 Msun and R_A = 1.756 +/- 0.043 +/- 0.017 Rsun (statistical and systematic errorbars). We find the equivalent quantities for the transiting planet to be M_b = 0.906 +/- 0.024 +/- 0.018 Mjup and R_b = 1.487 +/- 0.038 +/- 0.015 Rjup, with an equilibrium temperature of 1725 +/- 31 K. Compared to previous results, which were based on much sparser photometric data, we find the star to be more massive and evolved, and the planet to be larger, hotter and more rarefied. The properties of the planet are not matched by standard models of irradiated gas giants. Its large radius anomaly is in line with the observation that the hottest planets are the most inflated, but at odds with the suggestion of inverse proportionality to the [Fe/H] of the parent star. We assemble all available times of transit midpoint and determine a new linear ephemeris. Previous findings of transit timing variations in the HAT-P-13 system are shown to disagree with these measurements, and can be attributed to small-number statistics.

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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