The Epoch of Giant Planet Migration Planet Search Program. I. Near-Infrared Radial Velocity Jitter of Young Sun-like Stars

摘要: We present early results from the Epoch of Giant Planet Migration program, a precise RV survey over one hundred intermediate-age ($\sim$20$-$200 Myr) G and K dwarfs with Habitable-Zone Finder spectrograph (HPF) at McDonald Observatory's Hobby-Eberly Telescope (HET). The goals this program are to determine timescale dominant physical mechanism giant planet migration interior water ice line Sun-like stars. Here, we summarize first 14 months focus on our custom pipeline for HPF, measurement intrinsic near-infrared activity young Solar analogs, modeling underlying population-level distribution stellar jitter. demonstrate on-sky stability sub-2 m s$^{-1}$ level K2 standard HD 3765 using least-squares matching method extract RVs. Based subsample 29 stars least three measurements find median RMS 34 s$^{-1}$. This is nearly factor 2 lower than in optical 60 comparison sample similar ages spectral types as targets. observed jitter well reproduced log-normal parent $\mu=4.15$ $\sigma=1.02$. Finally, by compiling values previous search programs, show that generally decays age fashion wavelengths, albeit shallower slope overall $\lesssim$1 Gyr.