Temporal morphological changes in the Imhotep region of comet 67P/Churyumov-Gerasimenko

O. Groussin, H. Sierks, C. Barbieri, P. Lamy, R. Rodrigo, D. Koschny, H. Rickman, H. U. Keller, M. F. A'Hearn, A. T. Auger, M. A. Barucci, J. L. Bertaux, I. Bertini, S. Besse, G. Cremonese, V. Da Deppo, B. Davidsson, S. Debei, M. De Cecco, M. R. El-MaarryS. Fornasier, M. Fulle, P. J. Gutiérrez, C. Güttler, S. Hviid, W. H. Ip, L. Jorda, J. Knollenberg, G. Kovacs, J. R. Kramm, E. Kührt, M. Küppers, L. M. Lara, M. Lazzarin, J. J. Lopez Moreno, S. Lowry, S. Marchi, F. Marzari, M. Massironi, S. Mottola, G. Naletto, N. Oklay, M. Pajola, A. Pommerol, N. Thomas, I. Toth, C. Tubiana, J. B. Vincent

研究成果: 雜誌貢獻期刊論文同行評審

54 引文 斯高帕斯(Scopus)

摘要

Aims. We report on the first major temporal morphological changes observed on the surface of the nucleus of comet 67P/Churyumov-Gerasimenko in the smooth terrains of the Imhotep region. Methods. We used images of the OSIRIS cameras onboard Rosetta to follow the temporal changes from 24 May 2015 to 11 July 2015. Results. The morphological changes observed on the surface are visible in the form of roundish features that are growing in size from a given location in a preferential direction at a rate of 5.6-8.1 × 10-5 m s-1 during the observational period. The location where the changes started and the contours of the expanding features are bluer than the surroundings, which suggests that ices (H2O and/or CO2) are exposed on the surface. However, sublimation of ices alone is not sufficient to explain the observed expanding features. No significant variations in the dust activity pattern are observed during the period of changes.

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文章編號A36
期刊Astronomy and Astrophysics
583
DOIs
出版狀態已出版 - 1 11月 2015

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