The empty primordial asteroid belt

Autor(es)

Raymond, Sean N. ^[1] ; Izidoro, Andre ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, B18N, Allee Geoffroy St Hilaire, F-33615 Pessac - France

^[2] Univ Estadual Paulista UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENCE ADVANCES; v. 3, n. 9 SEP 2017.
• Citações Web of Science: 12

Resumo

The asteroid belt contains less than a thousandth of Earth's mass and is radially segregated, with S-types dominating the inner belt and C-types the outer belt. It is generally assumed that the belt formed with far more mass and was later strongly depleted. We show that the present-day asteroid belt is consistent with having formed empty, without any planetesimals between Mars and Jupiter's present-day orbits. This is consistent with models in which drifting dust is concentrated into an isolated annulus of terrestrial planetesimals. Gravitational scattering during terrestrial planet formation causes radial spreading, transporting planetesimals from inside 1 to 1.5 astronomical units out to the belt. Several times the total current mass in S-types is implanted, with a preference for the inner main belt. C-types are implanted from the outside, as the giant planets' gas accretion destabilizes nearby planetesimals and injects a fraction into the asteroid belt, preferentially in the outer main belt. These implantation mechanisms are simple by-products of terrestrial and giant planet formation. The asteroid belt may thus represent a repository for planetary leftovers that accreted across the solar system but not in the belt itself. (AU)

• 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