IMPROVED SPECTROSCOPIC PARAMETERS FOR TRANSITING PLANET HOSTS
IMPROVED SPECTROSCOPIC PARAMETERS FOR TRANSITING PLANET HOSTS
复制标题
DOI：
10.1088/0004-637x/757/2/161
复制
发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
G. Torres;D. Fischer;A. Sozzetti;L. Buchhave;J. Winn;M. Holman;J. Carter
中科院分区：
文献类型：
--
作者：
G. Torres;D. Fischer;A. Sozzetti;L. Buchhave;J. Winn;M. Holman;J. Carter
我们报告同质光谱测定的有效温度，金属丰度，并预计56凌日行星的主恒星的旋转速度。我们的分析主要是基于恒星参数分类（SPC）技术。我们通过检查数据的子集与其他两种方法，经常在以前的研究中使用（光谱学容易（SME）和MOOG）的系统误差。SPC和SME的结果，都是基于合成光谱和实际光谱之间的比较，显示Teff，[Fe/H]，和log g之间的强相关性时，同时解决所有三个数量。相比之下，基于更传统的增长曲线方法的MOOG结果显示没有这种相关性。为了消除相关性并提高温度和金属丰度的准确性，我们重复SPC分析，并基于可以从凌日光变曲线分析中得出的平均恒星密度对log g进行约束。以前的研究没有利用这一约束，已经受到恒星质量和半径的系统误差分别高达20%和10%，这可能比其他观测不确定性更大，也会导致行星质量和半径的系统误差。
We report homogeneous spectroscopic determinations of the effective temperature, metallicity, and projected rotational velocity for the host stars of 56 transiting planets. Our analysis is based primarily on the stellar parameter classification (SPC) technique. We investigate systematic errors by examining subsets of the data with two other methods that have often been used in previous studies (Spectroscopy Made Easy (SME) and MOOG). The SPC and SME results, both based on comparisons between synthetic spectra and actual spectra, show strong correlations between Teff, [Fe/H], and log g when solving for all three quantities simultaneously. In contrast the MOOG results, based on a more traditional curve-of-growth approach, show no such correlations. To combat the correlations and improve the accuracy of the temperatures and metallicities, we repeat the SPC analysis with a constraint on log g based on the mean stellar density that can be derived from the analysis of the transit light curves. Previous studies that have not taken advantage of this constraint have been subject to systematic errors in the stellar masses and radii of up to 20% and 10%, respectively, which can be larger than other observational uncertainties, and which also cause systematic errors in the planetary mass and radius.