The properties of planet host-stars and the evolution of the milky way: Looking at the PLATO P2-sample

It is now well established that the properties of planets are related to the properties of the host stars. Many different relations have already been established. However, it is still an open question how the evolution of our galaxy affects the planets. It could well be that planets which form during a phase when the star-formation rate was high, are different from planets that formed during a phase when it was low. Perhaps certain types of planets only form at specific phases. The main reason for this lack of knowledge is that it is rather difficult to determine the ages of main-sequence stars accurately. Ideal would be to study the planet population of stars with accurately determined ages. This will soon become possible with the PLATO (PLAnetary Transits and Oscillations of stars) mission. PLATO will provide not only very accurate masses, and radii of the planets, it will also determine the ages of the host stars accurately using the combination of asteroseismology with ground-based, high-resolution spectroscopy. Particularly interesting are stars in the P2-sample, because they are brighter than V=8.5 mag. Their ages and other properties can thus be determined very accurately. The P2-sample contains 871stars of spectral types F5-K7, and luminosity class IV and V. Since 2025 we have started a campaign to obtain high-resolution spectra of these stars. Our survey already allows to draw already the first conclusions what the properties of sample that PLATO will observe is.