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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kofman, Wlodek W.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2017 Interior of 67P/C-G comet as seen by CONSERT bistatic radar on Rosetta
- 2016Cosmochemical implications of CONSERT permittivity characterization of 67P/CG
- 2016An interpretation of the CONSERT and SESAME-PP results based on new permittivity measurements of porous water ice and ice-basaltic/organic dust mixtures suggests an increase of porosity with depth in 67P
- 2016Looking at Comet 67P Sub-surface in the Vicinity of Abydos
- 2016Characterizing the interior of 67P in the vicinity of Abydos
- 2016Cosmochemical implications of CONSERT permittivity characterization of 67P/C-G
- 2016Heterogeneities of 67P nucleus seen by CONSERT in the vicinity of Abydos
- 2016Mineralogical Implications of CONSERT Permittivity Characterization of 67P
- 2016Effect of meter-scale heterogeneities inside 67P nucleus on CONSERT data
- 2015Insights gained from Data Measured by the CONSERT Instrument during Philae's Descent onto 67P/C-G's surface
- 2015Broadband permittivity measurements on porous planetary regoliths simulants, in relation with the Rosetta mission to 67P/C-G
- 2015CONSERT Radar Investigations of the Shallow Subsurface of Comet 67P, in the Vicinity of the Philae Lander
- 2015Broadband Permittivity Measurements on Porous Planetary Soil Simulants, in Relation with the Rosetta Mission
- 2015The CONSERT Instrument during Philae's Descent onto 67P/C-G’s surface: Insights on Philae’s Attitude and the Surface Permittivity Measurements at the Agilkia-Landing-Site
- 2015Revealing the Possible Existence of a Near-Surface Gradient in Local Properties of 67P/Churyumov-Gerasimenko Nucleus Through CONSERT Measurements
- 2015The interior of 67P/C-G nucleus revealed by CONSERT measurements and simulations
- 2014Revealing the properties of Chuyurmov-Gerasimenko's shallow sub-surface through CONSERT's measurements at grazing angles
- 2009Comet nuclei primordial aggregation effects on their internal structure
- 2008Imaging of the Internal Structure of Comet 67P/Churyumov-Gerasimenko from Radiotomography CONSERT Data (Rosetta Mission) through spectral techniques
- 2008Comet nuclei aggregation and thermal simulations to prepare the Rosetta mission
- 2007Imaging of the Internal Structure of Comet 67P/Churyumov-Gerasimenko from Radiotomography CONSERT Data by Using Grid Computing Techniques (Rosetta Mission).
Places of action
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article
Comet nuclei primordial aggregation effects on their internal structure
Abstract
Comet nuclei have a low density ( 500 kg.m-3, e.g. [1]) and are easily disrupted. In situ studies have unveiled surface features hinting at a pervasive internal layered structure on 9P/Tempel 1 [2]. This indicates that specific processes occurred during its formation and lifetime. Our simulations describe the internal structure of comet nuclei due to their formation as aggregates of cometesimals [3]. The simulations take into account the amount of kinetic energy dissipated by sintering processes, the ejection of material during the impact and the variation in density and sizes of the cometesimals. From 10000 to 100000 cometesimals are considered with sizes down to tens of meters. A cohesive strength and density layering of the material occurs, leading to a highly cohesive core with less cohesive outer layers. The thickness of such layers is comparable to the larger layers observed at 9P/Tempel 1 ( 200 m). The porosity also increases with the distance to the centre of the nucleus. The cohesive strength of the nuclei obtained (<104 N.m-2) compares well with values deduced from disruption events observations and laboratory impact experiments. When the ejected material is lost, the internal structure of the nucleus can be erased. This suggests that either the structures observed are not primordial (cryovolcanism [4]) or that secondary mechanisms, such as the re-accretion of fragments after destructive collision, have occurred during the accretion process [5]. The results are used to improve cometary nuclei models for the analysis of the CONSERT experiment onboard Rosetta, which will study the dielectric properties and internal heterogeneities of the nucleus.