Migration-driven diversity of super-Earth compositions

Autor(es)

Raymond, Sean N. ^{[1, 2]} ; Boulet, Thibault ^[3] ; Izidoro, Andre ^[4] ; Esteves, Leandro ^[4] ; Bitsch, Bertram ^[5]

Afiliação do(s) autor(es)

^[1] CNRS, Lab Astrophys Bordeaux, Allee Geoffroy St Hilaire, F-33165 Pessac - France

^[2] Univ Bordeaux, Allee Geoffroy St Hilaire, F-33165 Pessac - France

^[3] Inst Astrophys & Geophys, Lab Imagerie Syst Stellaires & Planetaires, B-4000 Liege - Belgium

^[4] Univ Estadual Paulista, UNESP, Grp Dinam Orbital Planetol Guaratingueta, BR-12516410 Sao Paulo - Brazil

^[5] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg - Germany

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 479, n. 1, p. L81-L85, SEP 2018.
• Citações Web of Science: 11

Resumo

A leading model for the origin of super-Earths proposes that planetary embryos migrate inward and pile up on close-in orbits. As large embryos are thought to preferentially form beyond the snowline, this naively predicts that most super-Earths should be very water-rich. Here we show that the shortest period planets formed in the migration model are often purely rocky. The inward migration of icy embryos through the terrestrial zone accelerates the growth of rocky planets via resonant shepherding. We illustrate this process with a simulation that provided a match to the Kepler-36 system of two planets on close orbits with very different densities. In the simulation, two super-Earths formed in a Kepler-36-like configuration; the inner planet was pure rock while the outer one was ice-rich. We conclude from a suite of simulations that the feeding zones of close-in super-Earths are likely to be broad and disconnected from their final orbital radii. (AU)

• Processo FAPESP: 17/09963-7 - Modelagem numérica da formação e da dinâmica de sistemas planetários
• Beneficiário: Leandro Esteves de Paula
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 16/19556-7 - Formação e Dinâmica Planetária: do Sistema Solar a Exoplanetas
• Beneficiário: André Izidoro Ferreira da Costa
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 16/12686-2 - Formação e dinâmica planetária: do Sistema Solar a exoplanetas
• Beneficiário: André Izidoro Ferreira da Costa
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores