Trans-Neptunian Objects as Natural Probes to the Unknown Solar System

摘要: Trans-Neptunian objects (TNOs) are icy/rocky bodies that move beyond the orbit of Neptune in a region known as trans-Neptunian belt (or Edgeworth-Kuiper belt). In contrast to predictions accretion models feature protoplanetary disk planetesimals evolving on dynamically cold orbits (with both very small eccentricities, e, and inclinations, i), reality TNOs exhibit surprisingly wide ranges orbital eccentricities inclinations. Several theoretical have addressed origin evolution main dynamical classes TNOs, but none successfully reproduced them all. addition, explained several peculiar orbits, or provided insightful predictions, without which model cannot be tested properly against observations. Based extensive simulations planetesimal disks with presence four giant planets huge numbers modeled planetesimals, I explore detail dynamics particular their (un)stable regions over timescales comparable age solar system, role resonances across entire region. also propose that, along history planets, primordial embryos (massive Mars-Earth masses) can explain fine structure belt, Jovian Neptunian Trojans, possibly current planets. Those were ultimately scattered by process stirred levels observed at 40-50 AU. particular, constraints optimally satisfied if least one such embryo (planetoid) survived outskirts system.