Portal de Periódicos da CAPES

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

2019; Institute of Physics; Volume: 158; Issue: 3 Linguagem: Inglês

10.3847/1538-3881/ab3651

1538-3881

David Nesvorný, David Vokrouhlický, S. A. Stern, B. Davidsson, Michele T. Bannister, Kathryn Volk, Ying-Tung Chen, Brett Gladman, J. J. Kavelaars, Jean-Marc Petit, Stephen Gwyn, Mike Alexandersen,

Planetary Science and Exploration

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 OSSOS survey 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 axis a 7.5 au and diameter 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<a 10 km bodies and the Oort cloud should contain (5.0+/-1.9)x10^8 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.