Resumo:
Primitive asteroids are considered transitional objects between rocky and icy bodies. They are expected to present volatile-rich content, such as hydrated minerals. The hydration level can be obtained by the study of the 0.7 microns absorption band in the visible range. Mapping the presence of this band in asteroids spectra enables the study of the distribution of phyllosilicates across the main belt. Such effort can help to constrain models and to shed light into the evolutionary history of the Solar System. In this thesis we aim to study the distribuition of the 0.7 μm band at the outskirts of the main belt and the methodology that can be applied to identify the band with spectrophotometric data. The first approach is within the context The PRIMASS (PRIMitive Asteroids Spectroscopy Survey), which aims to characterize primitive asteroids throughout the asteroid belt. We study visible and near-infrared spectroscopy of members of the dynamical groups Hildas and Cibeles. We find that the Cibele population is more diverse than the Hildas and that the former may delimit the hydration zone. The study is then extended to compare with the Themis Family and Jupiter trojans, with the SDSS and NEOWISE data. The extended analysis reveals a possible compositional gradient from the main belt to the trojan population. On the second approach we present the J-PLUS and S-PLUS surveys. We describe the computational infrastructure that will allow in the near future to catalog the spectrophotometric information of thousands of asteroides obtained with these projects. We compare the sensivity for the detection of the 0.7 μm band with the diferent spectrophotometric systems. It is expected that the J-PLUS/S-PLUS system will provide a more reliable analysis than the one with SDSS data. astronomy;planetary science;asteroids
