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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.)

Particles Co-orbital to Janus and to Epimetheus: A Firefly Planetary Ring

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Autor(es):
Winter, Othon C. [1] ; Souza, Alexandre P. S. [1] ; Sfair, Rafael [1] ; Giuliatti Winter, Silvia M. [1] ; Mourao, Daniela C. [1] ; Foryta, Dietmar W. [2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP - Brazil
[2] Univ Fed Parana UFPr, Curitiba, Parana - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: ASTROPHYSICAL JOURNAL; v. 852, n. 1 JAN 1 2018.
Citações Web of Science: 0
Resumo

The Cassini spacecraft found a new and unique ring that shares the trajectory of Janus and Epimetheus, co-orbital satellites of Saturn. Performing image analysis, we found this to be a continuous ring. Its width is between 30% and 50% larger than previously announced. We also verified that the ring behaves like a firefly. It can only be seen from time to time, when Cassini, the ring, and the Sun are arranged in a particular geometric configuration, in very high phase angles. Otherwise, it remains ``in the dark,{''} invisible to Cassini's cameras. Through numerical simulations, we found a very short lifetime for the ring particles, less than a couple of decades. Consequently, the ring needs to be constantly replenished. Using a model of particle production due to micrometeorites impacts on the surfaces of Janus and Epimetheus, we reproduce the ring, explaining its existence and the ``firefly{''} behavior. (AU)

Processo FAPESP: 11/08171-3 - Dinâmica orbital de pequenos corpos
Beneficiário:Othon Cabo Winter
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 16/24561-0 - A relevância dos pequenos corpos em dinâmica orbital
Beneficiário:Othon Cabo Winter
Linha de fomento: Auxílio à Pesquisa - Temático