Coordenação de Astronomia e Astrofísica - COAA




Descrição do Seminário


Primitive Asteroids, PRIMASS and J-Plus surveys and beyond

Resumo: Primitive asteroids (PAs) are the associated with the Carbonaceous Chondite meteorites (CCs), the meteorites that contain the most primitive material in the Solar System. PAs are characterized by low-albedo, dark surfaces, presenting a visible to near-infrared spectra with almost no strong features. The majority of near-Earth primitive asteroids come from the inner belt, and more specifically from some of the low-albedo collisional families located there. Anyhow, some of them can come from primitive collisional families in the middle and outer belt and from the outer belt populations. Some subtle features on their spectra indicate the presence of hydrated silicates and/or organic material. Recently, two studies discovered for the first time water-ice and organic molecules on two outer-belt primitive asteroids, (24) Themis and (65) Cybele and it is shown that some primitive asteroids can develop comet-like coma and tail likely due to water-ice sublimation. In this seminar I will present the most relevant known properties of PAs and our on going spectroscopic PRIMASS survey that includes both visible and near-infrared spectra of primitive asteroid families and primitive asteroid populations using state of the art facilities like the 10.4m GTC telescope. I will also present the study of PAs we are starting with the J-Plus spectrophotometric survey and the next step in PAs research using the James Webb Space Telescope.

Palestrante: Javier Licandro

Instituto: IAC

Data: 08/12/2016

Hora: 15:30

Local: Auditório do prédio Emmanuel Liais

Responsável: Luan Ghezzi e Bruna Vajgel




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