Exoplanets in the Galactic context: Planet occurrence rates in the thin disk, thick disk and stellar halo of Kepler stars
arXiv:2112.03927 · doi:10.1093/mnras/stab3596
Abstract
In order to gain a better understanding of planet formation and evolution, it is important to examine the statistics of exoplanets in the Galactic context. By combining information on stellar elemental abundances and kinematics, we constructed separate samples of Kepler stars according to their affiliation to the Galactic components of thin disk, thick disk and stellar halo. Using a Bayesian analysis with conjugate priors, we then investigated how planet occurrence rates differ in different regions of planet properties. We find that young, slow and metal-rich stars, associated mainly with the thin disk, host on average more planets (especially close-in super Earths) compared to the old, fast and metal-poor thick disk stars. We further assess the dependence between stellar properties such as spectral type and metallicity, and planet occurrence rates. The trends we find agree with those found by other authors as well. We argue that in the Galactic context, these are probably not the main properties that affect planet occurrence rates, but rather the dynamical history of stars, and especially stellar age and kinematics, impact the current distribution of planets in the Galaxy.
11 pages, 7 figures, accepted for publication in MNRAS
References in corpus (12)
- Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
- Searching the Entirety of Kepler Data. II. Occurrence Rate Estimates for FGK Stars
- An image of the dust sublimation region in the nucleus of NGC 1068
- PLATO as it is: a legacy mission for Galactic archaeology
- Constraining planet structure and composition from stellar chemistry: trends in different stellar populations
- Kinematics of planet-host stars and their relation with dynamical streams in the solar neighbourhood
- Planets Across Space and Time (PAST). I. Characterizing the Memberships of Galactic Components and Stellar Ages: Revisiting the Kinematic Methods and Applying to Planet Host Stars
- Small Planets in the Galactic Context: Host Star Kinematics, Iron, and Element Enhancement
- Searching For Transiting Planets Around Halo Stars. II. Constraining the Occurrence Rate of Hot Jupiters
- Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler
- Planetary mass-radius relations across the galaxy
- Quantifying the Similarity of Planetary System Architectures