In this section
@inproceedings{Benseguane:2024:10.5194/epsc2021-303,
author = {Benseguane, S and Guilbert-Lepoutre, A and Lasue, J and Leyrat, C and Besse, S and Beth, A and Costa, Sitjà M and Grieger, B and Teresa, Capria M},
doi = {10.5194/epsc2021-303},
title = {A new take on the formation and evolution of circular depressions at the surface of 67P/Churyumov-Gerasimenko},
url = {http://dx.doi.org/10.5194/epsc2021-303},
year = {2024}
}
TY - CPAPER
AB - <jats:p> IntroductionSome of the comets visited by spacecraft missions display some circular depressions at their surface: 81P/Wild 2 (Brownlee et al. 2004), 9P/Tempel 1 (Belton et al. 2013), 103P/Hartley 2 (Bruck Syal et al. 2013), 67P/C-G (Vincent et al. 2015). For 67P, they consist of circular holes, half holes or cliffs, with a size range of tens of meters to a few hundreds of meters (Ip et al. 2016). Owing to the high precision of the shape model obtained from the Rosetta/OSIRIS images (Preusker et al. 2015, Sierks et al. 2015), it is possible to investigate the thermal processing of 67P’s surface in relation to the formation and evolution of these features (Mousis et al. 2015, Vincent et al. 2015, Guilbert-Lepoutre et al. 2016).  MethodsWe aim to investigate the formation and evolution of 67P’s circular depressions (or pits, thereafter) by thermally-induced processes (for instance sublimation and amorphous water ice crystallization) on its current orbit. In a departure from the aforementioned studies, we consider a high-resolution shape model of the nucleus, which allows to study several facets for each pit: at the bottom, and on the walls. For each facet, the complete thermal environment is considered, including self-heating and shadowing, either by neighboring facets or due to the complex global morphology of the comet. We compute the illumination, self-heating and shadowing conditions for 125k facets during a full orbit, with a time step of ~8 min, then use these conditions as an input of a 1D thermal evolution model for each facet. The model includes standard features: heat conduction, phase transitions, gas diffusion, erosion, dust mantling (De Sanctis et al. 2005, 2010, Lasue et al. 2008). Various initial setups have been considered, and many tests were conducted to assess the influence of each parameter. The behaviour of 30 circular depressions (pits, half pits and cliffs) was stud
AU - Benseguane,S
AU - Guilbert-Lepoutre,A
AU - Lasue,J
AU - Leyrat,C
AU - Besse,S
AU - Beth,A
AU - Costa,Sitjà M
AU - Grieger,B
AU - Teresa,Capria M
DO - 10.5194/epsc2021-303
PY - 2024///
TI - A new take on the formation and evolution of circular depressions at the surface of 67P/Churyumov-Gerasimenko
UR - http://dx.doi.org/10.5194/epsc2021-303
ER -