Toward Understanding the Evolution of Exoplanetary Systems: Occurrence Rate and Stellar Age
Speaker: Kento Masuda (Osaka University)
Abstract:
The orbits and physical properties of exoplanets may continue to evolve long after their formation. For instance, it has long been discussed that the shortest-period planets may have orbits unstable to tidal dissipation, ultimately causing them to spiral into their host stars. Additionally, recent transit observations of low-mass planets have uncovered evidence of atmospheric escape, which may shed light on their internal composition. Understanding these evolutionary processes is vital for interpreting the diversity of exoplanetary systems and situating our solar system within a broader context. In this talk, I will present our ongoing efforts to statistically probe these changes by analyzing the dependence of exoplanet occurrence rates on stellar age. Specifically, I will discuss our recent work on deriving the age-dependent occurrence rates of giant planets orbiting Sun-like stars using isochronal ages, and will also mention insights into the rotation-based age estimation method gained from high-resolution spectroscopy of Sun-like stars in twin binaries.