Precise Modeling of the Exoplanet Host Star and CoRoT Main Target HD 52265

TL;DR

This study provides a highly detailed asteroseismic analysis of the exoplanet host star HD 52265, refining its fundamental parameters and enhancing understanding of star-planet systems.

Contribution

It introduces a comprehensive asteroseismic modeling approach for HD 52265, including various chemical compositions and surface effects, and compares multiple modeling techniques.

Findings

Precise mass, radius, and age of HD 52265 determined.

Effective temperature and luminosity accurately estimated.

Initial helium abundance inferred.

Abstract

This paper presents a detailed and precise study of the characteristics of the Exoplanet Host Star and CoRoT main target HD 52265, as derived from asteroseismic studies. The results are compared with previous estimates, with a comprehensive summary and discussion. The basic method is similar to that previously used by the Toulouse group for solar-type stars. Models are computed with various initial chemical compositions and the computed p-mode frequencies are compared with the observed ones. All models include atomic diffusion and the importance of radiative accelerations is discussed. Several tests are used, including the usual frequency combinations and the fits of the \'echelle diagrams. The possible surface effects are introduced and discussed. Automatic codes are also used to find the best model for this star (SEEK, AMP) and their results are compared with that obtained with the detailed method. We find precise results for the mass, radius and age of this star, as well as its effective temperature and luminosity. We also give an estimate of the initial helium abundance. These results are important for the characterization of the star-planet system.