OSSOS. XIX. Testing Early Solar System Dynamical Models Using OSSOS Centaur Detections

摘要

We use published models of the early solar system evolution with a slow, long-range and grainy migration of Neptune to predict the orbital element distributions and the number of modern-day Centaurs. The model distributions are biased by the Outer Solar System Origins Survey (OSSOS) simulator and compared with the OSSOS Centaur detections. We find an excellent match to the observed orbital distribution, including the wide range of orbital inclinations which was the most troublesome characteristic to fit in previous models. A dynamical model, in which the original population of outer disk planetesimals was calibrated from Jupiter trojans, is used to predict that OSSOS should detect 11?±?4 Centaurs with semimajor axes of a? ?7.5 au, and diameter of D?>?10 km (absolute magnitude H r < 13.7 for a 6% albedo). This is consistent with 15 actual OSSOS Centaur detections with H r ? ?10 km. The inner scattered disk at 50??10 km comets. Population estimates for different diameter cutoffs can be obtained from the size distribution of Jupiter trojans (N(>D) ∝ D ?2.1 for 5?