Orateur
Hans Rickman
(Uppsala University)
Description
Solar type stars typically form as members of embedded clusters, which dissolve on different time scales depending on their masses and densities. Most such clusters are small and short-lived, and Oort Cloud (OC) formation has often been modeled within such a scenario. But Lada & Lada (2003) showed that about equal numbers of stars are formed in clusters with populations of 10^2, 10^3 and 10^4 stars. This makes it likely that the Sun's birth cluster was more long-lived than assumed in OC formation models. We have investigated what happens to the intermediate and outer parts (in terms of semi-major axis) of OCs that form very early in such massive and long-lived clusters. Our results indicate that the survival of a full-fledged OC after the Sun's escape from this birth cluster depends critically on the existence of a massive inner core, comparable in size to the Sedna population.
Auteur principal
Thomas Nordlander
(Uppsala University)
Co-auteurs
Bengt Gustafsson
(Uppsala University)
Hans Rickman
(Uppsala University)
