Tracing Planetary Evolution from Infancy to Maturity
Andrew Mann
University of North Carolina

Planets are not born in their final state. Before reaching a more mature and stable phase, young planets actively evolve as they interact with their host star, other planets in the system, and their greater environment. In this talk, I will review our progress in understanding these early evolutionary processes and discuss new directions in this emerging field. In the past few years, K2 has discovered dozens of young and infant transiting planets, offering direct constraints on how close-in exoplanets migrate, contract, and lose atmosphere over their lifetimes. Follow-up of these young planets has also revealed signs of a complex dynamical history for many planets. Upcoming instruments and missions offer the opportunity to build on these discoveries. Astrometry from the ongoing Gaia space telescope can provide masses and orbits for hundreds of young planets at wide separations, and synergies between large (e.g., TESS and JWST) and low-cost (e.g., CubeSats) missions will enable detailed study of the chemical evolution in atmospheres around short-period planets. These efforts will culminate with NASA's Flagship missions (LUVOIR or HabEx) and 30m-class telescopes, with which we can study the analogues of a young Earth and place our own planet's history in a Galactic context.