Compacted loose particles from numerical simulations compared to Rosetta collected particles

Isabelle Maroger (1) , Jérémie Lasue (1) , Robert Botet (2) , Philippe Garnier (1) , Sihane Merouane (3) , Thurid Mannel (4) , Anny Chantal Levasseur-Regourd (5) , Mark Stephen Bentley (6)

1 IRAP - Institut de recherche en astrophysique et planétologie
2 LPS - Laboratoire de Physique des Solides
3 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
4 IWF - Space Research Institute of Austrian Academy of Sciences
5 PLANETO - LATMOS
6 ESAC - European Space Astronomy Centre

The Rosetta space mission included three main instruments for solid dust particle analysis. The combined microscope and mass spectrometer COSIMA (Cometary Secondary Ion Mass Analyser) [1], the atomic force microscope MIDAS (Micro-Imaging Dust Analysis System) [2], and the impact detector GIADA (Grain Impact Analyser and Dust Accumulator) [3]. These three instruments provide complementary insights into dust particles properties over a wide range of sizes/masses (10nm to 1mm). GIADA and MIDAS observed a major contribution from compact dust particles together with a population of porous particles with a low fractal dimension (D_f~1,7 for MIDAS [4]) [5, 6]. The fractal dust component of the nucleus and its properties give constraints on the formation of comets in the early solar system [5]. In this work, we analyseresults from a simple numerical model of dust aggregates compactionto assess the initial physical properties of the dust populations.

Domaines: Astrophysique [astro-ph]

Isabelle Maroger, Jérémie Lasue, Robert Botet, Philippe Garnier, Sihane Merouane, et al.. Compacted loose particles from numerical simulations compared to Rosetta collected particles. 49th Lunar and Planetary Science Conference 2018, Mar 2018, The Woodlands, Texas, United States. pp.LPI Contrib No 2083. ⟨insu-01720081⟩