en fr Cometary nuclei and their activity processes Les noyaux cométaires et leurs processus dactivité Reportar como inadecuado




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1 LAM - Laboratoire d-Astrophysique de Marseille

Abstract : The study of cometary nuclei is of paramount importance to understand the formation and the evolution of the solar system.
This thesis presents several methods and models to determine their physical properties radius, geometric albedo, thermal inertia and active surface fraction from visible observations, infrared observations and water production rate, and to quantify the activity on their surface.
We study the nucleus of comets Hale-Bopp C-1995 O1, 55P-Tempel-Tuttle, 126P-IRAS, 103P-Hartley 2, 22P-Kopff, 46P-Wirtanen, IRAS-Araki-Alcock C-1983 H1 and 2P-Encke, of Centaurs Chiron 2060 and Chariklo 1997 CU26, and of sungrazing comets.
From this analysis, we find that: i the geometric albedo of Centaurs is 0.07-0.11 which is higher than the geometric albedo of LPC Long Period Comets and SPC Short Period Comets which is 0.04-0.07, ii a low albedo is not incompatible with the presence of water ice on the surface, iii the thermal inertia of the nucleus is low and is



Autor: Olivier Groussin -

Fuente: https://hal.archives-ouvertes.fr/



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