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Seminar 16.12.2020 13:00

Опубликовано: 15/12/2020

1. Authors: Emel’yanenko V.V. 

Title:ORIGIN OF DISTANT TRANS-NEPTUNIAN OBJECTS 

Abstract:

We have analyzed the orbital distribution of distant trans-Neptunian objects. We note new features for objects with perihelion distances q>40 au and semimajor axes а>100 au in addition to the known grouping in longitudes of perihelion. The observed orbital distribution points to the existence of two groups of distant trans-Neptunian objects with different dynamical characteristics. It is difficult to explain the detected features within the framework of the previously introduced concept on the existence of the ninth planet in the Solar system (Batygin & Brown, 2016, AJ, 151, 22). Therefore, a new model is proposed, which is based on the results from (Vorobyov & Elbakyan, 2018, Astronomy & Astrophysics, 618, A7) on the formation and evolution of giant gaseous clumps arising via gravitational instability and fragmentation of the protoplanetary disk. In this model, we study the dynamical evolution of giant clumps moving in orbits with different inclinations and  planetesimals initially located in the Hill regions of these clumps. Planetesimals are ejected from the Hill regions when the giant clumps move in high-eccentricity orbits and have close encounters with each other. The resulting orbital distribution of planetesimals in our model and the observed distribution of distant trans-Neptunian objects have similar features.