ES-03-0002

Chemical and kinematic age proxies of planet hosting stars from GAIA DR3

Ravinder Kumar Banyal, Swastik C., Mayank Narang , Manoj P. , Sivarani T.

The GAIA space mission is impacting astronomy in many significant ways by providing a uniform, homogeneous and precise data set for over 1 billion stars and other celestial objects in the Milky Way and beyond. The exoplanet science too has greatly benefited from the unprecedent accuracy of stellar parameters obtained from the GAIA. In this work we used photometric, astrometric, and spectroscopic data from the most recent Gaia DR3 to study the kinematic and chemical age proxies of a largest sample of >2000 planet hosting main-sequence stars whose parameters have been
determined uniformly. Using spectroscopic data from the Radial Velocity Spectrometer (RVS) onboard GAIA, we show that stars hosting massive planets are metal-rich (iron and iron-peak elements) and alpha-poor in comparison to stellar companions of small planets. The kinematic analysis of the sample also reveals that the host stars of small planets and giant planets have different galactic space velocities and orbital parameters, indicating they might belong to different age groups. The stellar ages estimated using isochrone fitting, also seem consistent with ages
determined from elemental abundances and kinematic studies. In summary, our independent findings suggest that the giant planetary systems are most likely younger compared to the population of stars hosting small planets, regardless of the methodology used.