Precise determination of fundamental parameters of six exoplanet host stars and their planets

TL;DR

This study accurately determines fundamental parameters of six exoplanet host stars and their planets by incorporating additional observational constraints like lithium abundance and rotational period, improving precision over previous methods.

Contribution

It introduces a stellar modeling approach that includes diffusion, rotation-induced mixing, and additional observational constraints to enhance parameter estimation accuracy.

Findings

More precise stellar and planetary parameters obtained.

Inclusion of lithium abundance and rotational period improves model constraints.

Enhanced understanding of physical states of exoplanet host stars.

Abstract

The aim of this paper is to determinate the fundamental parameters of six exoplanet host (EH) stars and their planets. While techniques for detecting exoplanets yield properties of the planet only as a function of the properties of the host star, hence, we must accurately determine parameters of EH stars at first. For this reason, we constructed a grid of stellar models including diffusion and rotation-induced extra-mixing with given ranges of input parameters (i.e. mass, metallicity, and initial rotation rate). In addition to the commonly used observational constraints such as the effective temperature T_{eff}, luminosity L and metallicity [Fe/H], we added two observational constraints, the lithium abundance log N (Li) and the rotational period P_{rot}. These two additional observed parameters can make further constrains on the model due to their correlations with mass, age and other stellar properties. Hence, our estimations of fundamental parameters for these EH stars and their planets are with higher precision than previous works. Therefore, the combination of rotational period and lithium help us to obtain more accurate parameters for stars, leading to an improvement of the knowledge of the physical state about the EH stars and their planets.