Abstract Details

Name: Mayank Narang
Affiliation: Tata Institute of Fundamental Research
Conference ID: ASI2021_242
Title : Are Jupiter-hosting stars young? A Gaia kinematic study of ages of exoplanet host stars.
Authors and Co-Authors : Mayank Narang (TIFR), Manoj Puravankara (TIFR), H. C. Bhatt, (IIA)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Understanding the age distribution of planetary systems and how planet properties depend on the age of the host stars can provide us with important clues to the planet formation processes. Since individual age measurements of planet-hosting main-sequence stars are difficult, we have used the dispersion in the peculiar velocity of these stars as a proxy for stellar age. We studied the kinematics of exoplanet host stars and field stars in the solar neighborhood (within 250 pc from the Sun) using Gaia DR2. We further investigated the dependence of velocity dispersion of host stars on planet properties and by proxy the dependence of planet properties on the age of the system. Our analysis shows that as the planet mass increases, the velocity dispersion of the host star decreases, indicating that Jupiter-like planets, on average, are found around younger host stars as compared to Earth-like planets. We find that the average age of Jupiter-hosting stars is < 6 Gyrs, while stars hosting Earth-like planets are relatively older. If confirmed, our results would provide a natural explanation for the observed dependence of planet mass on the host star metallicity and spectral type.