Collisional evolution of the trans-Neptunian region in an early dynamical instability scenario

ABSTRACT Any early or late dynamical instability in the outer Solar system should have left their footprint on trans-Neptunian object (TNO) populations. Here, we study collisional and evolution of such populations numerically by an updated version ALICANDEP, which suitably takes into account onset instability. Key parameters for are chosen to match results with current observables. The new model (ALICANDEP-22) considers original region located between 22 30 au, containing 20–30 M⊕ from bodies either dynamically ejected implanted plutinos hot classical belt. An situ population objects is also present since beginning, corresponding cold-classical population. Collisional allowed starting initial conditions accounting streaming models observational constraints. ALICANDEP-22 successfully reproduces constraints as well shape size-frequency distribution expected Trojan concludes that Arrokoth likely a primordial body but cannot be conclusive origin comet 67P/Churyumov–Gerasimenko. presence larger than Pluto TNO – waiting discovered compatible distributions allow