Fractures on comet 67P/Churyumov-Gerasimenko observed by Rosetta/OSIRIS

M. R. El-Maarry, N. Thomas, A. Gracia-Berná, R. Marschall, A. T. Auger, O. Groussin, S. Mottola, M. Pajola, M. Massironi, S. Marchi, S. Höfner, F. Preusker, F. Scholten, L. Jorda, E. Kührt, H. U. Keller, H. Sierks, M. F. A'Hearn, C. Barbieri, M. A. BarucciJ. L. Bertaux, I. Bertini, G. Cremonese, V. Da Deppo, B. Davidsson, S. Debei, M. De Cecco, J. Deller, C. Güttler, S. Fornasier, M. Fulle, P. J. Gutierrez, M. Hofmann, S. F. Hviid, W. H. Ip, J. Knollenberg, D. Koschny, G. Kovacs, J. R. Kramm, M. Küppers, P. L. Lamy, L. M. Lara, M. Lazzarin, J. J. Lopez Moreno, F. Marzari, H. Michalik, G. Naletto, N. Oklay, A. Pommerol, H. Rickman, R. Rodrigo, C. Tubiana, J. B. Vincent

研究成果: 雜誌貢獻期刊論文同行評審

70 引文 斯高帕斯(Scopus)

摘要

The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) experiment onboard the Rosetta spacecraft currently orbiting comet 67P/Churyumov-Gerasimenko has yielded unprecedented views of a comet's nucleus. We present here the first ever observations of meter-scale fractures on the surface of a comet. Some of these fractures form polygonal networks. We present an initial assessment of their morphology, topology, and regional distribution. Fractures are ubiquitous on the surface of the comet's nucleus. Furthermore, they occur in various settings and show different topologies suggesting numerous formation mechanisms, which include thermal insulation weathering, orbital-induced stresses, and possibly seasonal thermal contraction. However, we conclude that thermal insolation weathering is responsible for creating most of the observed fractures based on their morphology and setting in addition to thermal models that indicate diurnal temperature ranges exceeding 200K and thermal gradients of ∼15K/min at perihelion are possible. Finally, we suggest that fractures could be a facilitator in surface evolution and long-term erosion. Key Points Fractures are observed on the surface of a comet for the first time Different fracture settings and topologies suggest various formation mechanisms Fractures may be a key driver in the evolution of the surface.

原文???core.languages.en_GB???
頁(從 - 到)5170-5178
頁數9
期刊Geophysical Research Letters
42
發行號13
DOIs
出版狀態已出版 - 16 7月 2015

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