Physics – Optics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........25d&link_type=abstract
Thesis (PHD). University of Paris VII
Physics
Optics
Scientific paper
I present some observational results using near-infrared reflectance spectroscopy and adaptive optics to study the nature of the surface of some selected minor bodies. The spectroscopic observations of dark asteroids were motivated by the recent discovery of a strong absorption band in the reflection spectrum of Pholus. Pholus is one of the most pristine object of our solar system, a remnant of the planetesimals that accreted after the collapse of the solar nebula. I looked for the spectral signature of dark material in the spectrum of the most primitive asteroids. None of the selected objects show an absorption band in its spectrum similar to the one detected for Pholus. This result helps to answer to fundamental questions about the nature of the material the planetesimals accreted from, the role of the aging processes on the surface of primitive bodies and the boundary between cometary nuclei and asteroids. Adaptive optics is a technique that allows to obtain diffraction limited images on large telescopes and therefore to study the surface of solar system bodies that were until recently out of reach to ground-based observations. I used adaptive optics to study the surface of the asteroids Vesta and Ceres as well as to image Io's volcanoes. These ground-based observations of Vesta lead to a better understanding of the formation of this differenciated asteroid and its possible link to basaltic achondrite meteorites. The techniques I have developed to reduce the observations made with an adaptive optics and extract the mineralogical maps of the objects, are described in this thesis.
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