رسالة جامعية
Study of the composition and physical properties of the surface of comet 67P/CG. VIRTIS/Rosetta data interpretation and reflectance measurement of cometary analogs. ; Étude de la composition et des propriétés physiques de surface de la comète 67P/Churyumov-Gerasimenko. Interprétation des données VIRTIS/Rosetta et mesure en réflectance d’analogues cométaires.
| العنوان: | Study of the composition and physical properties of the surface of comet 67P/CG. VIRTIS/Rosetta data interpretation and reflectance measurement of cometary analogs. ; Étude de la composition et des propriétés physiques de surface de la comète 67P/Churyumov-Gerasimenko. Interprétation des données VIRTIS/Rosetta et mesure en réflectance d’analogues cométaires. |
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| المؤلفون: | Rousseau, Batiste |
| المساهمون: | Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), MENESR, PSL research University, LESIA - Observatoire de Paris, Stéphane Érard |
| المصدر: | https://theses.hal.science/tel-01691784Test ; Planétologie. PSL research University; LESIA - Observatoire de Paris, 2017. Français. ⟨NNT : ⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2017 |
| المجموعة: | Archive de l'Observatoire de Paris (HAL) |
| مصطلحات موضوعية: | Comet, Rosetta/VIRTIS, Data analysis, Hyperspectral imaging, Spectroscopy, Laboratory experiments, Comète, Analyse de données, Imagerie hyperspectrale, Spectroscopie, Expériences de laboratoire, [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] |
| الوصف: | During the Solar System formation, 4.6 billion years ago, comets accreted materials which have been transformed according to the physical and dynamical conditions of the accretion disk. They also accreted a part of components coming from the interstellar medium. By preserving a primordial composition, the study of comets allows us to better understand the conditions of the proto-planetary disk surrounding the young Sun of an epoch which is now inaccessible. Moreover, it consists also to understand the various comets populations, their formation process, dynamical and activity evolution as they inward and outward the Sun or their structure.The ESA/Rosetta mission followed the comet 67P/Churyumov-Gerasimenko for two years. A ten of instruments has been dedicated to the study of the evolution of its activity, gas release, surface morphology, dust and other objectives. VIRTIS is a visible/infrared spectrometer instrument. It is composed of VIRTIS-M, an imaging spectrometer which gives access to spatial information with moderate spectral resolution and VIRTIS-H, a point spectrometer with a higher spectral resolution. This study is based on the data analysis of VIRTIS instruments and is divided into two parts focused on the study of the nucleus surface. The first part is an analysis of the spectral and photometric parameters: albedo, spectral slope, the main direction of the light diffusion by particles, macroscopic roughness. In a global study, I highlighted the spatial variations of albedo and spectral slope; compared results derived from different models as well as from both instruments. Then, I determined these parameters locally, revealing differences between two types of terrains. This approach allows to better understand the mechanisms linked to the activity (dust drop-off/uprising, space weathering, ice content variation) and also to the surface properties (composition, texture). The second goal of the thesis is to reproduce in the laboratory the observations realized by VIRTIS to give constraints on the ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| العلاقة: | tel-01691784; https://theses.hal.science/tel-01691784Test; https://theses.hal.science/tel-01691784/documentTest; https://theses.hal.science/tel-01691784/file/20171024_Version_finale_Batiste_Rousseau.pdfTest |
| الإتاحة: | https://theses.hal.science/tel-01691784Test https://theses.hal.science/tel-01691784/documentTest https://theses.hal.science/tel-01691784/file/20171024_Version_finale_Batiste_Rousseau.pdfTest |
| حقوق: | http://creativecommons.org/licenses/by-nc-ndTest/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.6E94824F |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |