| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
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
| Organizations | Location | People |
|---|
document
An 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
Abstract
The CONSERT bistatic radar on Rosetta and Philae sounded the interior of the small lobe of 67P/C-G at 90 MHz and determined the average of the real part of the complex permittivity (hereafter ε') to be equal to 1.27±0.05 [1,2]. The permittivity probe (PP) of the SESAME package sounded the near-surface in the 400–800 Hz range and derived a lower limit of ε' equal to 2.45±0.20 [3,4]. At the time of the measurements, the temperature was found to be below 150 K at Philae's location and expected to be close or below 100 K inside the nucleus [4-6].The complex permittivity depends of the frequency, the composition, the porosity and the temperature of the material [7,8,9]. These parameters have to be taken into account to interpret the permittivity values. The non-dispersive behavior of ε' below 150 K [9], allows us to compare the CONSERT and SESAME-PP results and to interpret their difference in terms of porosity and/or composition. For this purpose we use a semi-empirical formula obtained from reproducible permittivity measurements performed in the laboratory at 243 K on water ice particles and ice-basaltic dust mixtures [10], with a controlled porosity in the 26–91% range and dust-to-ice volumetric ratios in the 0.1–2.8 range. The influence of the presence of organic materials on ε' is also discussed based on new measurements of analogues of complex extraterrestrial organic matter [11]. Our results suggest an increase of the porosity of the small lobe of 67P with depth [11], in agreement Lethuillier et al. [4]'s conclusion using a different method.[1]Kofman et al., 1998. Adv. Space Res., 21, 1589. [2]Ciarletti et al., 2015. A&A, 583, A40. [3]Seidensticker et al., 2007. Space Sci. Rev., 128, 301. [4]Lethuillier et al., 2016. A&A, 591, A32. [5]Spohn et al., 2015. Science, 349, aab0464. [6]Festou et al. (Eds.), Comets II. Univ. of Arizona Press. [7]Campbell and Ulrichs, 1969. J. Geophys. Res., 74, 5867. [8]Brouet et al., 2015. A&A, 583, A39. [9]Mattei et al., 2014. Icarus, 229, 428. [10]Brouet et al., 2016. J. Geophys. Res., under review. [11]Brouet et al., 2016. MNRAS, Rosetta special issue, submitted.