Astronomy & Astrophysics Seminar: The Origin of Compact Exoplanetary Systems

Raluca Rufu, Southwest Research Institute

23 November 2022, 14:10 
Kaplun Building, Room 103 
Astronomy & Astrophysics Seminar

Zoom: https://tau-ac-il.zoom.us/j/85031132958?pwd=UXZNS05ST01KVXhGTTdLRU9WekZEdz09

 

Abstract:

One of the most surprising discoveries in exoplanet science has been the existence of compact systems of Earth to super-Earth sized planets. These multi-planet systems have nearly circular, coplanar orbits located at distances of only ∼ 0.01 − 0.1 AU, a region devoid of planets in our Solar System. Although compact systems comprise a large fraction of known exoplanetary systems, their origin remains debated. Common to all prior models of compact system origin is the assumption that infall to the stellar disk ends before planets form. However, there is growing observational, theoretical, and meteoritical evidence of the early growth of mm-sized “pebbles” during the infall phase. We propose that accretion of compact systems occurs during stellar infall. As a cloud core collapses, solids are gradually accumulated in the disk, producing favorable conditions for the formation and survival of close-in planets. A key feature of this model is that the reduced gas-to-solids ratio in the planet accretion region can allow for the formation and survival of compact systems, even with Type-I migration.

 

 

Seminar Organizer: Dr. Iair Arcavi

Tel Aviv University makes every effort to respect copyright. If you own copyright to the content contained
here and / or the use of such content is in your opinion infringing, Contact us as soon as possible >>