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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Building the Galilean moons system via pebble accretion and migration: a primordial resonant chain

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Madeira, Gustavo [1] ; Izidoro, Andre [2, 1] ; Giuliatti Winter, Silvia M. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo State, UNESP, Grp Dinam Orbital & Planetol, Av Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP - Brazil
[2] Rice Univ, Dept Earth Environm & Planetary Sci, MS 126, Houston, MS 77005 - USA
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 504, n. 2, p. 1854-1872, JUN 2021.
Citações Web of Science: 0

The origins of the Galilean satellites - namely Io, Europa, Ganymede, and Callisto - is not fully understood yet. Here we use N-body numerical simulations to study the formation of Galilean satellites in a gaseous circumplanetary disc around Jupiter. Our model includes the effects of pebble accretion, gas-driven migration, and gas tidal damping and drag. Satellitesimals in our simulations first grow via pebble accretion and start to migrate inwards. When they reach the trap at the disc inner edge, scattering events and collisions take place promoting additional growth. Growing satellites eventually reach a multiresonant configuration anchored at the disc inner edge. Our results show that an integrated pebble flux of >= 2 x 10(-3) M-J results in the formation of satellites with masses typically larger than those of the Galilean satellites. Our best match to the masses of the Galilean satellites is produced in simulations where the integrated pebble flux is similar to 10(-3) M-J. These simulations typically produce between three and five satellites. In our best analogues, adjacent satellite pairs are all locked in 2:1 mean motion resonances. However, they have also moderately eccentric orbits (similar to 0.1), unlike the current real satellites. We propose that the Galilean satellites system is a primordial resonant chain, similar to exoplanet systems as TRAPPIST-1, Kepler-223, and TOI-178. Callisto was probably in resonance with Ganymede in the past but left this configuration - without breaking the Laplacian resonance - via divergent migration due to tidal planet-satellite interactions. These same effects further damped the orbital eccentricities of these satellites down to their current values (similar to 0.001). Our results support the hypothesis that Io and Europa were born with water-ice rich compositions and lost all/most of their water afterwards. Firmer constraints on the primordial compositions of the Galilean satellites are crucial to distinguish formation models. (AU)

Processo FAPESP: 13/07375-0 - CeMEAI - Centro de Ciências Matemáticas Aplicadas à Indústria
Beneficiário:José Alberto Cuminato
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 16/12686-2 - Formação e dinâmica planetária: do Sistema Solar a exoplanetas
Beneficiário:André Izidoro Ferreira da Costa
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 16/19556-7 - Formação e Dinâmica Planetária: do Sistema Solar a Exoplanetas
Beneficiário:André Izidoro Ferreira da Costa
Linha de fomento: Bolsas no Brasil - Apoio a Jovens Pesquisadores
Processo FAPESP: 18/23568-6 - Cenários para a formação dos arcos de Netuno e dos grandes satélites dos gigantes gasosos
Beneficiário:Gustavo Oliveira Madeira
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 16/24561-0 - A relevância dos pequenos corpos em dinâmica orbital
Beneficiário:Othon Cabo Winter
Linha de fomento: Auxílio à Pesquisa - Temático