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This thesis will carry out the first thermal analysis of the NAOS CubeSat. The objective of this study is to verify that the temperatures of satellite components remain in their respective allowed ranges.

After a brief description of the satellite mission and configuration, its modeling will begin. First the complex shape of the satellite will be simplified in the Esatan geometric model. This model will be used by Esatan to define the thermal nodes and compute the radiative exchanges between the components. The modeling will continue with the definition of the thermal properties of the materials and surface finishes. The model will be corrected with the definition of capacitances and finished with the definition of conductive links between the shells.

After the definition of the worst cases, the first results will be obtained. It will be observed that the initial design will lead to excessive temperatures (for example 101.8 °C for the batteries). The design will have to be optimized. These optimizations will include the modification of the initial external surface finish replaced by white paint. The internal conductances will be improved by using five layers of copper inside the PCB and using a filler material for the spacers. Finally a realistic model of the detector assembly will be built. Its improvement will include the modification of the insulation and the increase of the radiator area.

With the final design determined, the worst cases, as well as intermediate cases, will be ran. The predicted temperatures of these cases will show that the batteries, ADCS and the detector will still present issues. Several recommendations for these components will then be suggested for future thermal designs of the satellite.

CubeSat --- Satellite --- Thermal --- Esatan --- Ingénierie, informatique & technologie > Ingénierie aérospatiale

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Nous avons étudié de façon théorique, à l'aide des modèles sismiques de troisième et quatrième génération propres aux étoiles sous-naines de type B, l'impact du changement successif d'un des paramètres structurels de ces modèles sur le spectre de pulsation des modes de pression et de gravité. Ensuite, nous avons procédé à une modélisation sismique de la sdB du système PG 1336-018 en premier lieu, pour contraindre les paramètres des modèles 3G et ensuite ceux des modèles 4G.

modélisation sismique --- sdB --- modélisations sismiques --- astérosismologie --- PG 1336-018 --- sous-naines --- Physique, chimie, mathématiques & sciences de la terre > Aérospatiale, astronomie & astrophysique

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Our study of fast sodium jets from Io with the TRAPPIST-South telescope, spanning four months of observation from December 4, 2014 to March 31, 2015, begins with the acquisition and the reduction of the raw data. The optics of the telescope and the very powerful brightness of Jupiter produce artifacts on the images still present after calibration. We used several image processing methods to improve the signal-to-noise ratio and clean our reduced images in order to optimize the region where a jet would be located and to optimize our measurements. Among the fifteen observations nights, we observed six nights with sodium jets coming from Io. Then, we measured the length of all detected jets, extending over several Jovian radii, and the angle with the Jupiter-Io line. The night of December 4, 2014 is the most impressive, the extent of the detected jet is approximately seven Jovian radii. This first study allows us to improve the next observations with the ultimate aim of observing these jets and finally improve our understanding about them.

TRAPPIST --- Io --- Sodium jet --- Image processing --- observations --- Physique, chimie, mathématiques & sciences de la terre > Aérospatiale, astronomie & astrophysique

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This work focuses on the development of the Pipeline for the Infrared Spectroscopy of COmets (PISCO), an integrated compilation of tools and home-made scripts aimed to efficiently and entirely process IR comet observations, from raw images to yielding the production rates. It is part of a starting effort from the Comet group of the STAR Institute of the University of Liège to develop IR spectroscopy capabilities with the ultimate goal of making joint observation campaigns of both the parent species (detectable in the IR) and daughter species (detectable in the UV-Vis) in comets. Challenges and perspectives for the study of comets and multiwavelength spectroscopy are presented. The different steps of PISCO are described in details, before using the pipeline to process a 8P/Tuttle comet CRIRES dataset. Finally, possible improvements are discussed.

comets --- infrared --- spectroscopy --- Physique, chimie, mathématiques & sciences de la terre > Aérospatiale, astronomie & astrophysique