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Reference : UMR8109-SYLDES-014
Workplace : MEUDON
Date of publication : Friday, June 26, 2020
Scientific Responsible name : Antonella Barucci
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
MMX (Mars Moons eXploration) is a mission of the Japanese space agency JAXA with a strong participation of CNES. By close observation and analysis of samples, the scientific objective of the mission is to reveal the origins of the moons of Mars and thus to try to answer the question of the role of small bodies in the formation of the planetary systems in the habitable zone. MMX will be launched in 2024 for a nominal mission duration of 5 years. MMX will take on board several scientific instruments including a rover and a sampling system which will be brought back to Earth at the end of the mission (2029). Among this scientific payload There is the MIRS instrument (MMX InfraRed Spectrometer), developed under the project management of LESIA (Laboratory of Space Studies and Instrumentation in Astrophysics, at the Paris Observatory) and of CNES, with important contributions from other CNRS laboratories.
MIRS is an infrared imaging spectrometer in the 0.9 - 3.6 µm spectral range. MIRS will perform the spectral mapping of Phobos and Deimos thus addressing the scientific questions of the formation of the Martian system but will also contribute, by the observation of Mars, to better understand the atmospheric processes of this planet. By observing Phobos at different scales (from the global to a few centimeters) MIRS will be one of the instruments contributing to the choice of the sampling site.
The objective of the thesis will be to participate in the development of the instrument by performing its calibrations.
LESIA, Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, is a laboratory of Paris Observatory, located on the Meudon site. LESIA is specialized in the instrumentation of scientific instruments for space and ground-based astrophysics.
The different steps of the thesis are:
1) Familiarize yourself with the spectroscopy obtained by the OSIRIS-Rex (NASA) and Hayabusa2 (JAXA) space missions respectively on the two asteroids Bennu and Ryugu. An analysis of Bennu and Ryugu data will be performed. (October 2020-March 2021)
2) Participate in the definition of ground calibrations (2021 - 2022)
3) Data analysis, reconstruction of cubes (2022 - early 2023)
4) Writing the thesis (since the beginning of 2023 with a defense in October 2023)
The objectives of the thesis for the student will be to follow the different phases of the development of the instrument with control of the scientific objectives.
The development of the instrument is based on the building of 3 models: STM, QM and FM. The student will be able to follow the different steps in the realization of each models and the characterization of certain subsystems (detector, scanner, optical quality, etc.) that will be necessary in order to assess the performance assessment (radiometric and geometric) of the 'instrument. Especially for the QM and FM models.
Calibration is a major step in evaluating the performance of the integrated instrument under thermal and illumination conditions similar to those that the instrument will encounter in flight. The student will participate in the calibration by defining and implementing the measurement sequences. An intimate knowledge of the instrument will be required to interpret the calibration data and assess the impact of instrumental biases on scientific data.
Constraints and risks
The candidate must hold a Master 2 or an engineering degree in the fields of optics or astronomical instrumentation;
Knowledge of data analysis, Python.
No risk, because the data on Ryugu and Bennu are already available (by the Hyabusa2 and OSIRIS-Rex missions).
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