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| 題名: | The Agilkia boulders/pebbles size-frequency distributions: OSIRIS and ROLIS joint observations of 67P surface |
| 作者: | 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. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astrophysics;comets: individual: 67P C-G;Earth and Planetary Astrophysics;methods: data analysis;methods: statistical;Sciences of the Universe |
| 日期: | 2016-01-01 |
| 上傳時間: | 2026-04-21 14:46:30 (UTC+8) |
| 出版者: | Oxford University Press;Oxford University Press (OUP): Policy P - Oxford Open Option A |
| 摘要: | 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 |
| 顯示於類別: | [天文研究所] 期刊論文
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