Survival Rates of Planets in Open Clusters: the Pleiades, Hyades, and Praesepe clusters

摘要: In clustered environments, stellar encounters can liberate planets from their host stars via close encounters. Although the detection probability of suggests that planet population in open clusters resembles field, only a few dozen planet-hosting have been discovered clusters. We explore survival rates against similar to Pleiades, Hyades, and Praesepe embedded performed series N-body simulations high-density low-density clusters, grow mergers subclusters, semi-analytically calculated rate star up 1Gyr using relative velocities, masses, impact parameters intruding stars. Less than 1.5% close-in within 1 AU at most 7% with 1-10 are ejected by environments after dynamical evolution If 0.01-100 an cluster initially follows distribution function exoplanets semi-major axis ($a_p$) between 0.03-3 field RV surveys, PDF surviving beyond ~10 be slightly modified $\propto a_p^{-0.76}$. The production free-floating (FFPs) per is 0.0096-0.18, where we assumed all one giant mass 1--13 MJ circular orbit. expected frequency FFPs compatible upper limit on indicated recent microlensing surveys. Our suggest 10 around FGKM-type rich relatively-young (<~10-100 Myr for ~1-10 clusters), less massive which promising targets searches.