[P-CG19] 系外惑星

[PCG19-05] Probing the Occurrence Rate of Exoplanets as a Function of Stellar Age

*宮崎 翔太¹、増田 賢人² (1.宇宙航空研究開発機構　宇宙科学研究所、2.大阪大学)

キーワード：系外惑星、ホットジュピター

More than 5000 exoplanets have been discovered and most are close to their host stars. It has been suggested that such planetary systems may experience changes with time in their orbits and physical properties. For example, hot Jupiters, which are giant planets with orbital periods of less than 10 days, can experience tidal destruction by tidal interactions with their host stars. The occurrence rate of planets as a function of age may be used as one of the direct observational evidence for such physical processes and evolutions. However, in general, it is difficult to accurately estimate individual stellar age observationally, and the estimated uncertainty of stellar age is often strongly correlated with that of other stellar physical properties (mass, metallicity, etc...). As a result, it had been difficult to quantitatively discuss the age dependency of the planetary occurrence rate.
In this talk, we will present a new statistical framework to estimate planet occurrence as a function of various stellar parameters including ages, where we fully take into account the issues. We will provide an overview of this methodology, share the results of applying the framework to a sample of gas giants from Doppler surveys, and discuss its potential applications for future surveys.