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arXiv 1407.6765astro-ph.SR
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中/高自转太阳型恒星的光谱参数。10个行星主机的新参数

Spectroscopic parameters for solar-type stars with moderate/high rotation. New parameters for 10 planet-hosts

M. Tsantaki, S. G. Sousa, N. C. Santos, M. Montalto, E. Delgado-Mena, A. Mortier, V. Adibekyan, G. Israelian

摘要:

行星研究需要精确和准确的恒星参数作为输入来推断行星的性质。不同的方法通常会提供不同的结果,这可能导致行星参数的偏差。在这项工作中,我们提出了一种改进的光谱合成技术,旨在更好地处理更迅速地旋转FGK恒星。这种方法被用来获得精确的恒星参数,即有效温度,表面重力,金属性和旋转速度。这一程序是测试样品的低和中等/快速旋转FGK星。光谱分析是基于光谱合成包光谱容易(SME),假设在LTE中的库鲁茨模型大气。进行合成的线列表由铁线组成,原子数据是在太阳校准后得出的。我们的恒星参数的比较显示出良好的协议与文献值,无论是低旋转和高旋转的恒星。此外,我们的结果是在同一尺度上的参数从铁离子电离和激发方法在我们以前的工作。我们提出了新的大气参数的10个过境行星主机作为更新的SWEET-Cat目录。我们还重新分析了它们的凌日光变曲线,以获得新的更新的行星性质。

英文摘要:

Planetary studies demand precise and accurate stellar parameters as input to infer the planetary properties. Different methods often provide different results that could lead to biases in the planetary parameters. In this work, we present a refinement of the spectral synthesis technique designed to treat better more rapidly rotating FGK stars. This method is used to derive precise stellar parameters, namely effective temperature, surface gravity, metallicitity and rotational velocity. This procedure is tested for samples of low and moderate/fast rotating FGK stars. The spectroscopic analysis is based on the spectral synthesis package Spectroscopy Made Easy (SME), assuming Kurucz model atmospheres in LTE. The line list where the synthesis is conducted, is comprised of iron lines and the atomic data are derived after solar calibration. The comparison of our stellar parameters shows good agreement with literature values, both for low and for higher rotating stars. In addition, our results are on the same scale with the parameters derived from the iron ionization and excitation method presented in our previous works. We present new atmospheric parameters for 10 transiting planet-hosts as an update to the SWEET-Cat catalogue. We also re-analyse their transit light curves to derive new updated planetary properties.

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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