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Etude des propriétés physiques des astéroïdes par imagerie à haute ré́solution angulaire

Abstract : Our understanding of the origin and evolution of the Solar System and its implication towards the formation of the early planetesimal has become a primary goal in planetary sciences over the recent years. In this respect, a considerable amount of information regarding the primordial planetary processes that occurred during and immediately after the accretion of the early planetesimals is still present among the population of Small Solar System Bodies. Consequently, studying asteroids is of prime importance to understand the planetary formation processes, and, first and foremost, requires a reliable knowledge of their physical (size, shape, spin, mass, density, internal structure), and surface properties (albedo distributions and mineralogy) Using high angular-resolution adaptive-optics-fed imaging and spectro-imaging observations, I study two main belt asteroids, targets of the NASA Dawn mission : (1) Ceres and (4) Vesta. I found dwarf planet (1) Ceres to be likely differentiated with some high latitude markings consistent with the presence of water frost on its surface. Relationships between spectral slope and topography on one hand, and albedo on the other have been found on (4) Vesta's surface. The hypothesis of a remnant magnetic field shielding (4) Vesta's surface from space weathering is favored. Then I describe a new method to analyze the physical properties of small bodies from images of their apparent disk and their light-curves. I apply it on two asteroids, (2) Pallas and (41) Daphne, allowing determination of their density to a very precise level. I discuss the biases and systematical errors of the various methods used nowadays to study physical properties, highlighting the vantages of this new technique. Its use as a calibrator of asteroid physical properties for future surveys like ESA's probe Gaia is mentioned. Finally, I present a dynamical analysis of the triple Kuiper Belt system (136108) Haumea, with insights on the tides effects at play ; as well as a characterization of its associated dynamical family. I conclude by the presentation of a test of the capabilities of mid-infrared spectroscopy to constrain the mineralogy of asteroids.
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https://tel.archives-ouvertes.fr/tel-00475398
Contributor : Benoît Carry <>
Submitted on : Wednesday, April 21, 2010 - 6:38:58 PM
Last modification on : Thursday, December 10, 2020 - 11:09:03 AM
Long-term archiving on: : Wednesday, November 30, 2016 - 5:17:44 PM

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  • HAL Id : tel-00475398, version 1

Citation

Benoît Carry. Etude des propriétés physiques des astéroïdes par imagerie à haute ré́solution angulaire. Astrophysique [astro-ph]. Université Paris-Diderot - Paris VII, 2009. Français. ⟨tel-00475398⟩

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