The stability in the most external region of the Oort Cloud: The evolution of the ejected comets

Abstract

In this paper, we present a study about the dynamical effects of the Galaxy on the external region of the Oort Cloud. The aims of this paper are: i) to determine an outer limit for the Oort Cloud; and ii) to analyse the dynamical behaviour of the most external objects of the Cloud and how they are ejected from the Solar System. This is undertaken by following the temporal evolution of massless test particles in the Galactic environment of the solar neighbourhood. Here we show that the effect of the perturbations from the Galactic tide in the particles is similar to that find for the evolution of wide binary stars population. Moreover, in the Oort Cloud we found a dynamical structure around 10 5 au conformed by objects unbound of the Sun. This structure allows us to define a transition region of stability and an outer boundary for the Oort Cloud, and it is also in agreement with previous results about the disruption of wide binary stars.

arXiv commentAccepted for publishing in MNRAS. 13 pages, 9 figures, 2 tables

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• Oort cloud Ecology II: The chronology of the formation of the Oort cloud
• Capture of interstellar objects II: by the Solar system
• A Case Study of Interstellar Material Delivery: α Centauri
• Oort Cloud Formation and Evolution in Star Clusters
• Water and air consumption aboard interstellar arks
• A Catalogue of Interstellar Material Delivery From Nearby Debris Disks