The metallicity content of planet-host stars: the Ariel reference sample

12 Nov 2024, 12:15
30m
Sala Capitolo (Fuligno Cenacle)

Sala Capitolo

Fuligno Cenacle

Via Faenza 48, 50123, Firenze

Speaker

Maria Tsantaki (Istituto Nazionale di Astrofisica (INAF))

Description

Most of our current understanding of planet formation mechanism is based on the correlations of metallicity of planet-host stars with planet frequency and therefore, precise and accurate metallicity determinations are fundamental. In this talk, I will present the results of the characterization of the Ariel reference sample for a diverse sample of stars in terms of stellar mass (up to 1.8 M⊙) in collaboration with the “Ariel stellar characterization” working group. The standard methodology to derive high-precision stellar parameters from high-resolution spectra is based on the iron ionisation and equilibrium conditions and spectral synthesis techniques. Our analysis indicates a
close relationship between stellar mass and giant planet radius, with more inflated planets at lower metallicities. We find that giant planets are more frequent around more metal-rich stars that belong to the thin disc, while lower-mass planets are found also in more metal-poor environments, and are more frequent than giant planets in the thick disc.
The Galactic environment, although often overlooked, plays a significant role in shaping the planetary system. We provided observational data to investigate the impact of the chemical evolution of the Milky Way on the current planet populations

Primary author

Maria Tsantaki (Istituto Nazionale di Astrofisica (INAF))

Presentation materials