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

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 > 10km (absolute magnitude H-r 10 km. The inner scattered disk at 50 10km bodies and the Oort cloud should contain (5.0 +/- 1.9) x 10(8) D > 10 km comets. Population estimates for different diameter cutoffs can be obtained from the size distribution of Jupiter trojans (N(>D) proportional to D-2.1 for 5 < D < 100 km). We discuss model predictions for the Large Synoptic Survey Telescope observations of Centaurs.NASA Emerging Worlds program; Czech Science FoundationGrant Agency of the Czech Republic [18-06083S]; UK STFCScience & Technology Facilities Council (STFC) [ST/L000709/1]; National Research Council of Canada; National Science and Engineering Research Council of CanadaNatural Sciences and Engineering Research Council of Canada; NASANational Aeronautics & Space Administration (NASA) [NNX15AH59G, 80NSSC19K0785]; NSFNational Science Foundation (NSF) [AST1824869]This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu