The Agilkia boulders/pebbles size-frequency distributions: OSIRIS and ROLIS joint observations of 67P surface

Maurizio Pajola 1, 2 Sefano Mottola 3 Maximilian Hamm 3 Marco Fulle 4 B. Davidsson 5 C. Güttler 6 H. Sierks 6 G. Naletto 7, 2, 8 G. Arnold 3 Hans Grothues 9 R. Jaumann 10, 11 H. Michaelis 3 Jean-Pierre Bibring 12 C. Barbieri 2, 13 P. L. Lamy 14 R. Rodrigo 15, 16 D. Koschny 17 H. Rickman 18, 19 H. U. Keller 20 J. Agarwal 6 M. F. A’hearn 21 M. A. Barucci 22 Jean-Loup Bertaux 23 I. Bertini 2 S. Boudreault 6 G. Cremonese 24 V. Da Deppo 8 S. Debei 25 M. De Cecco 26 J. Deller 6 M. R. El Maarry 27 Clément Feller 22 Sonia Fornasier 22 A. Gicquel 6 Olivier Groussin 14 P. J. Gutiérrez 28 M. Hofmann 6 S. F. Hviid 3 H. Ip 29 L. Jorda 14 Jörg Knollenberg 3 J.-Rainer Kramm 6 Ekkehard Kührt 3 Michael Küppers 30 Florangela La Forgia 13 L. M. Lara 28 Z. Y. Lin 29 Monica Lazzarin 13 Josè Juan Lopez-Moreno 28 A. Lucchetti 24 Francesco Marzari 13 Matteo Massironi 31 Harald Michalik 32 Nilda Oklay 6 A. Pommerol 27 Frank Preusker 3 Frank Scholten 3 Nicholas Thomas 27 Cecilia Tubiana 6 Jean-Baptiste Vincent 6
23 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : By using the images acquired by the OSIRIS and ROLIS cameras, we derive the size-frequency distribution (SFD) of cometary pebbles and boulders covering the size range 0.05 - 30.0 m on the Agilkia landing site. The global SFD measured on OSIRIS images, reflects the different properties of the multiple morphological units present on Agilkia, combined with selection effects related to lifting, transport and redeposition. Contrarily, the different ROLIS SFD derived on the smooth and rough units may be related to their different regolith thickness present on Agilkia. In the thicker, smoother layer, ROLIS mainly measures the SFD of the airfall population that almost completely obliterate the signature of underlying boulders up to a size of the order of 1 m. This is well matched by the power-law index derived analysing coma particles identified by the grain analyser GIADA. This result confirms the important blanketing dynamism of Agilkia. The steeper SFD observed in rough terrains from 0.4 to 2 m could point out intrinsic differences between northern and southern dust size distributions, or it may suggest that the underlying boulders ”peek through” the thinner airfall layer in the rough terrain, thereby producing the observed excess in the decimeter size range. Eventually, the OSIRIS SFD performed on Philae landing unit may be due to water sublimation from a static population of boulders, affecting smaller boulders before the bigger ones, thus shallowing the original SFD.
Type de document :
Article dans une revue
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (Suppl. 1), pp.S242-S252. <10.1093/mnras/stw2720>
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Soumis le : mardi 25 octobre 2016 - 17:48:57
Dernière modification le : mardi 30 mai 2017 - 01:19:30

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Maurizio Pajola, Sefano Mottola, Maximilian Hamm, Marco Fulle, B. Davidsson, et al.. The Agilkia boulders/pebbles size-frequency distributions: OSIRIS and ROLIS joint observations of 67P surface. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (Suppl. 1), pp.S242-S252. <10.1093/mnras/stw2720>. <insu-01387594>

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