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Physical properties and dynamical relation of the circular depressions on comet 67P/Churyumov-Gerasimenko

Wing-Huen Ip 1, 2, 3 I.-L. Lai 3 J.-C. Lee 4 Y.-C. Cheng 1 Y. Li 2 Z.-Y. Lin 1 Jean-Baptiste Vincent 5 Sébastien Besse 6 Holger Sierks 5 Cesare Barbieri 7, 8 Philippe L. Lamy 9 Rafael Rodrigo 10, 11 Detlef Koschny 6 Hans Rickman 12, 13 Horst U. Keller 14 Jessica Agarwal 5 Michael F. A'Hearn 15 Maria A. Barucci 16 Jean-Loup Bertaux 17 Ivano Bertini 8 Dennis Bodewits 15 S. Boudreault 5 Gabriele Cremonese 18 Vania da Deppo 19 B. Davidsson 13 Stefano Debei 20 M. de Cecco 21 M. R. El-Maarry 22 Sonia Fornasier 16 Marco Fulle 23 Olivier Groussin 9 Pedro J. Gutiérrez 24 Carsten Guettler 5 Stubbe F. Hviid 25 Laurent Jorda 9 J. Knollenberg 25 G. Kovacs 5 J.-R. Kramm 5 Ekkehard Kührt 25 M. Küppers 26 F. La Forgia 7 Luisa M. Lara 24 M. Lazzarin 7 J. J. López-Moreno 24 S. Lowry 27 Simone Marchi 28 F. Marzari 7 H. Michalik 14 S. Mottola 25 G. Naletto 8, 29, 19 Nilda Oklay 5 M. Pajola 8 Nichoilas Thomas 22 E. Toth 30 Cécilia Tubiana 5
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Aims. We aim to characterize the circular depressions of comet 67P/Churyumov-Gerasimenko and investigate whether such surface morphology of a comet nucleus is related to the cumulative sublimation effect since becoming a Jupiter family comet (JFC). Methods. The images from the Rosetta/OSIRIS science camera experiment are used to construct size frequency distributions of the circular depression structures on comet 67P and they are compared with those of the JFCs 81P/Wild 2, 9P/Tempel 1, and 103P/Hartley 2. The orbital evolutionary histories of these comets over the past 100 000 yr are analyzed statistically and compared with each other. Results. The global distribution of the circular depressions over the surface of 67P is charted and classified. Descriptions are given to the characteristics and cumulative size frequency distribution of the identified features. Orbital statistics of the JFCs visited by spacecraft are derived. Conclusions. The size frequency distribution of the circular depressions is found to have a similar power law distribution to those of 9P/Tempel 1 and 81P/Wild 2. This might imply that they could have been generated by the same process. Orbital integration calculation shows that the surface erosion histories of 81P/Wild 2, and 9P/Tempel 1 could be shorter than those of 67P, 103 P/Hartley 2 and 19P/Borrelly. From this point of view, the circular depressions could be dated back to the pre-JFC phase or the transneptunian phase of these comets. The north-south asymmetry in the distribution of the circular depressions could be associated with the heterogeneous structure of the nucleus of comet 67P and/or the solar insolation history.
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Wing-Huen Ip, I.-L. Lai, J.-C. Lee, Y.-C. Cheng, Y. Li, et al.. Physical properties and dynamical relation of the circular depressions on comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 591, A132 (10 p.). ⟨10.1051/0004-6361/201628156⟩. ⟨hal-01440669⟩



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