We have carried out an intensive study of photometric (Kepler Mission) and spectroscopic data on the system Kepler-2 (HAT-P-7A) using the dedicated software WinFitter. The mean individual data-point error of the normalized flux values for this system is 0.00015, leading to the model's specification for the mean reference flux to an accuracy of $\sim$0.5 ppm. This testifies to the remarkably high accuracy of the binned data-set, derived from over 1.8 million individual observations. Spectroscopic data are reported with the similarly high-accuracy radial velocity amplitude measure of $\sim$2 m s$^{-1}$. The analysis includes discussion of the fitting quality and model adequacy. Our derived absolute parameters for Kepler-2 are as follows: $M_p$ (Jupiter) 1.80 $\pm$ 0.13; $R_{\star}$ 1.46 $\pm 0.08 \times 10^6$ km; $R_p$ 1.15 $\pm 0.07 \times 10^5$ km. These values imply somewhat larger and less condensed bodies than previously catalogued, but within reasonable error estimates of such literature parameters. We find also tidal, reflection and Doppler effect parameters, showing that the optimal model specification differs slightly from a `cleaned' model that reduces the standard deviation of the $\sim$3600 binned light curve points to less than 0.9 ppm. We consider these slight differences, making comparisons with the hot-jupiter systems Kepler-1 (TrES-2) and 13.

中文翻译：

---

系外行星系统 Kepler-2 与 Kepler-1 和 13 的比较

我们使用专用软件 WinFitter 对系统 Kepler-2 (HAT-P-7A) 上的光度（开普勒任务）和光谱数据进行了深入研究。该系统归一化通量值的平均单个数据点误差为 0.00015，导致模型对平均参考通量的规范精度为 $\sim$0.5 ppm。这证明了来自超过 180 万个单独观察的分箱数据集的非常高的准确性。光谱数据以类似的高精度径向速度幅度测量值 $\sim$2 ms$^{-1}$ 报告。分析包括对拟合质量和模型充分性的讨论。我们导出的 Kepler-2 绝对参数如下： $M_p$ (Jupiter) 1.80 $\pm$ 0.13; $R_{\star}$ 1.46 $\pm 0.08 \times 10^6$ 公里；$R_p$ 1.15 $\pm 0。07 \times 10^5$ 公里。这些值意味着比以前编目的更大和更少的凝聚体，但在这些文献参数的合理误差估计范围内。我们还发现潮汐、反射和多普勒效应参数，表明最佳模型规格与“清洁”模型略有不同，后者将 $\sim$3600 分档光曲线点的标准偏差降低到小于 0.9 ppm。我们考虑了这些细微的差异，并与热木星系统 Kepler-1 (TrES-2) 和 13 进行了比较。将 $\sim$3600 分档光曲线点的标准偏差降低到小于 0.9 ppm 的模型。我们考虑了这些细微的差异，并与热木星系统 Kepler-1 (TrES-2) 和 13 进行了比较。将 $\sim$3600 分档光曲线点的标准偏差降低到小于 0.9 ppm 的模型。我们考虑了这些细微的差异，并与热木星系统 Kepler-1 (TrES-2) 和 13 进行了比较。