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Multidisciplinary analysis of the Hapi region located on Comet 67P/Churyumov–Gerasimenko

Maurizio Pajola 1 J.-C. Lee 2 N. Oklay 3 S. F. Hviid 4 L. Penasa 5 S. Mottola 4 X. Shi 3 Sonia Fornasier 6 B. Davidsson 7 L. Giacomini 8 A. Lucchetti 1 M. Massironi 9 Jean-Baptiste Vincent 4 I. Bertini 10 G. Naletto 5, 10, 11 W.-H. Ip 12, 13 H. Sierks 3 Philippe Lamy 14 R. Rodrigo 15, 16 D. Koschny 17 H. U. Keller 4 J. Agarwal 3 M. A. Barucci 6 Jean-Loup Bertaux 14, 18 Dennis Bodewits 19 P. Cambianica 5 Gabriele Cremonese 1 V. Da deppo 11 S. Debei 20 M. De cecco 21 J. Deller 3 M. R. El maarry 22 C. Feller 6 S. Ferrari 5 M. Fulle 23 P. J. Gutierrez 24 C. Güttler 3 Luisa M. Lara 24 F. La forgia 10 M. Lazzarin 10 Z. y. Lin 12 J. J. Lopez moreno 24 F. Marzari 10 F. Preusker 4 F. Scholten 4 I. Toth 25 Cécilia Tubiana 3 
Abstract : By using the Rosetta/OSIRIS-NAC data set taken in 2014 August, we focus on the neck region, called Hapi, located on 67P Churyumov–Gerasimenko’s Northern hemisphere. The gravitational potential and slopes of Hapi, coupled with the geological unit identification and the boulder size–frequency distributions, support the interpretation that both taluses and gravitational accumulation deposits observable on Hapi are the result of multiple cliff collapses that occurred at different times. By contrast, the fine-particle deposits observable in the central part of the study area are made of aggregates coming from the Southern hemisphere and deposited during each perihelion passage. Both the consolidated terrains on the western part of Hapi, as well as the centrally aligned ridge made of boulder-like features, suggest that Hapi is in structural continuity with the onion-like structure of the main lobe of 67P. Despite the dusty blanket observable on Hapi, its terrains are characterized by water-ice-rich components that, once repeatedly and rapidly illuminated, sublimate, hence resulting in the strong jet activity observed in 2014 August.
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Maurizio Pajola, J.-C. Lee, N. Oklay, S. F. Hviid, L. Penasa, et al.. Multidisciplinary analysis of the Hapi region located on Comet 67P/Churyumov–Gerasimenko. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2019, 485 (2), pp.2139-2154. ⟨10.1093/mnras/stz446⟩. ⟨insu-02114153⟩



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