@article{86b36bbdca7940daabceecd1672e45f7,
title = "Multidisciplinary analysis of the Hapi region located on Comet 67P/Churyumov-Gerasimenko",
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.",
keywords = "Comets: individual (67P C-G), Methods: data analysis, Methods: statistical",
author = "M. Pajola and Lee, \{J. C.\} and N. Oklay and Hviid, \{S. F.\} and L. Penasa and S. Mottola and X. Shi and S. Fornasier and B. Davidsson and L. Giacomini and A. Lucchetti and M. Massironi and Vincent, \{J. B.\} and I. Bertini and G. Naletto and Ip, \{W. H.\} and H. Sierks and Lamy, \{P. L.\} and R. Rodrigo and D. Koschny and Keller, \{H. U.\} and J. Agarwal and Barucci, \{M. A.\} and Bertaux, \{J. L.\} and D. Bodewits and P. Cambianica and G. Cremonese and \{Da Deppo\}, V. and S. Debei and \{De Cecco\}, M. and J. Deller and \{El Maarry\}, \{M. R.\} and C. Feller and S. Ferrari and M. Fulle and Gutierrez, \{P. J.\} and C. G{\"u}ttler and Lara, \{L. M.\} and \{La Forgia\}, F. and M. Lazzarin and Lin, \{Z. Y.\} and \{Lopez Moreno\}, \{J. J.\} and F. Marzari and F. Preusker and F. Scholten and I. Toth and C. Tubiana",
note = "Funding Information: We thank the anonymous referee for important and constructive comments that lead to a substantial improvement in the paper. OSIRIS was built by a consortium of the Max-Planck-Institut f{\"u}r Sonnensystemforschung in G{\"o}ttingen, Germany, CISAS-University of Padova, Italy, the Laboratoire d'Astrophysique de Marseille, France, the Instituto de Astrofisica de Andalucia, CSIC, Granada, Spain, the Research and Scientific Support Department of the European Space Agency, Noordwijk, The Netherlands, the Instituto Nacional de Tecnica Aeroespacial, Madrid, Spain, the Universidad Politechnica de Madrid, Spain, the Department of Physics and Astronomy of Uppsala University, Sweden, and the Institut f{\"u}r Datentechnik und Kommunikationsnetze der Technischen Univer-sit{\"a}t Braunschweig, Germany. The support of the national funding agencies of Germany (DLR), Italy (ASI), France (CNES), Spain (MEC), Sweden (SNSB), and the ESA Technical Directorate is gratefully acknowledged. We thank the ESA teams at ESAC, ESOC and ESTEC for their work in support of the Rosetta mission. Publisher Copyright: {\textcopyright} 2019 The Author(s).",
year = "2019",
month = feb,
day = "15",
doi = "10.1093/mnras/stz446",
language = "British English",
volume = "485",
pages = "2139--2154",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",
}