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

TL;DR

This paper refines a spectral synthesis method to accurately determine stellar parameters for fast-rotating FGK stars, providing new data for 10 planet-hosting stars and updating their planetary properties.

Contribution

The authors develop a rapid spectral synthesis technique tailored for fast-rotating stars, improving the accuracy of stellar parameter determination compared to previous methods.

Findings

Good agreement with literature stellar parameters for various rotation speeds.

Consistent results with previous iron ionization and excitation methods.

Updated stellar and planetary parameters for 10 transiting planet-hosts.

Abstract

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.