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

    Pajola, M. and Mottola, S. and Hamm, M. and Fulle, M. and Davidsson, B. and Güttler, C. and Sierks, H. and Naletto, G. and Arnold, G. and Grothues, H.-G. and Jaumann, R. and Michaelis, H. and Bibring, J.P. and Barbieri, C. and Lamy, P.L. and Rodrigo, R. and Koschny, D. and Rickman, H. and Keller, H.U. and Agarwal, J. and A'Hearn, M.F. and Barucci, M.A. and Bertaux, J.L. and Bertini, I. and Boudreault, S. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Deller, J. and El-Maarry, Mohamed Ramy and Feller, C. and Fornasier, S. and Gicquel, A. and Groussin, O. and Gutierrez, P.J. and Hofmann, M. and Hviid, S.F. and Ip, W.H. and Jorda, L. and Knollenberg, J. and Kramm, J.R. and Kührt, E. and Küppers, M. and La Forgia, F. and Lara, L.M. and Lin, Z.Y. and Lazzarin, M. and Lopez Moreno, J.J. and Lucchetti, A. and Marzari, F. and Massironi, M. and Michalik, H. and Oklay, N. and Pommerol, A. and Preusker, F. and Scholten, F. and Thomas, N. and Tubiana, C. and Vincent, J.B. (2016) The Agilkia boulders/pebbles size–frequency distributions: OSIRIS and ROLIS joint observations of 67P surface. Monthly Notices of the Royal Astronomical Society 462 (Suppl), S242-S252. ISSN 0035-8711.

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    Abstract

    By using the images acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) and ROLIS (ROsetta Lander Imaging System) 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 which almost completely obliterates 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 Grain Impact Analyser and Dust Accumulator. 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 decimetre size range. Eventually, the OSIRIS SFD performed on the 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.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): methods: data analysis, methods: statistical, comets: individual: 67P C-G
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 12 Nov 2018 11:11
    Last Modified: 12 Nov 2018 11:11
    URI: http://eprints.bbk.ac.uk/id/eprint/25024

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