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

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101816

Title:	The Agilkia boulders/pebbles size-frequency distributions: OSIRIS and ROLIS joint observations of 67P surface
Authors:	葉永烜;Pajola, M.;Mottola, S.;Hamm, M.;Fulle, M.;Davidsson, B.;Güttler, C.;Sierks, H.;Naletto, G.;Arnold, G.;Grothues, H.-G.;Jaumann, R.;Michaelis, H.;Bibring, J. P.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Agarwal, J.;A'Hearn, M. F.;Barucci, M. A.;Bertaux, J. L.;Bertini, I.;Boudreault, S.;Cremonese, G.;Da Deppo, V.;Debei, S.;De Cecco, M.;Deller, J.;El Maarry, M. R.;Feller, C.;Fornasier, S.;Gicquel, A.;Groussin, O.;Gutierrez, P. J.;Hofmann, M.;Hviid, S. F.;Ip, W. H.;Jorda, L.;Knollenberg, J.;Kramm, J. R.;Kührt, E.;Küppers, M.;La Forgia, F.;Lara, L. M.;Lin, Z. Y.;Lazzarin, M.;Lopez Moreno, J. J.;Lucchetti, A.;Marzari, F.;Massironi, M.;Michalik, H.;Oklay, N.;Pommerol, A.;Preusker, F.;Scholten, F.;Thomas, N.;Tubiana, C.;Vincent, J. B.
Contributors:	理學院天文研究所
Keywords:	Astrophysics;comets: individual: 67P C-G;Earth and Planetary Astrophysics;methods: data analysis;methods: statistical;Sciences of the Universe
Date:	2016-01-01
Issue Date:	2026-04-21 14:46:30 (UTC+8)
Publisher:	Oxford University Press;Oxford University Press (OUP): Policy P - Oxford Open Option A
Abstract:	摘要： 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. 出版者： Oxford University Press (OUP): Policy P - Oxford Open Option A 出版日期： 2016 出處： Monthly notices of the Royal Astronomical Society, 2016, Vol.462 (Suppl 1), p.S242-S252 資源來源： Alma/SFX Local Collection 版權： CC0 1.0 - Universal 識別號： ISSN: 0035-8711 識別號： ISSN: 1365-2966 識別號： ISSN: 1365-8711 識別號： EISSN: 1365-2966 識別號： DOI: 10.1093/mnras/stw2720
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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