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Geomorphological and spectrophotometric analysis of Seth's circular niches on comet 67P/Churyumov–Gerasimenko using OSIRIS images

Alice Lucchetti 1 Maurizio Pajola 2 Sonia Fornasier 3 Stefano Mottola 4 Luca Penasa 5 Laurent Jorda 6 Gabriele Cremonese 1 Clément Feller 3 Pedro H. Hasselmann 3 Matteo Massironi 7 Sabrina Ferrari 5 Giampiero Naletto 5, 8, 9 Nilda Oklay 4 Holger Sierks 10 Cesare Barbieri 2, 11 Philippe L. Lamy 6 Rafael Rodrigo 12, 13 Detlef Koschny 14 Hans Rickman 15, 16 Horst Uwe Keller 17 Jessica Agarwal 10 Michael F. A'Hearn 18 Maria Antonella Barucci 3 Jean-Loup Bertaux 19 Ivano Bertini 11 Steve Boudreault 10 Vania da Deppo 8 Björn Davidsson 20 Stefano Debei 21 Mariolino de Cecco 22 Jakob Deller 10 Marco Fulle 23 Olivier Groussin 6 Pedro J. Gutiérrez 24 Carsten Güttler 10 Marc Hoffman 10 Stubbe F. Hviid 4 Wing-Huen Ip 25 Jörg Knollenberg 4 J.-Rainer Kramm 10 Ekkehard Kührt 4 Michael Küppers 26 Luisa M. Lara 24 Monica Lazzarin 11 Florangela La Forgia 11 L. Z. Lin 24 José J. Lopez Moreno 24 Francesco Marzari 11 Frank Preusker 4 Frank Scholten 4 Xian Shi 10 Nicolas Thomas 27 Cécilia Tubiana 10 Jean-Baptiste Vincent 10 
Abstract : We provide a detailed geomorphological and spectrophotometric analysis of the circular niches located on the Seth region of 67P using OSIRIS images. The features can be related to landslide events that occurred on 67P and shaped its surface, as the recent Aswan cliff collapse detected in the same region. We therefore provide an analysis of the area pre- and post-perihelion suggesting that no specific changes have been observed. To assess this, after performing a geomorphological map of the area that allows us to identify different terrain units, we computed the boulders cumulative size frequency distribution (SFD) of the niches, before and after the perihelion passage. The niches SFDs are characterized by a similar trend with two different power-law indices within the same deposit: lower power-law value (between −2.3 and −2.7) for boulders smaller than 5 m and steeper power-law value (between −4.7 and −5.0) for boulders larger than 5 m. These trends suggest that smaller boulders have evolved and progressively have been depleted (lower power-law index), while bigger boulders are more representative of the event that generated the deposit and are less degraded. Then, we perform the spectrophotometric analysis of this region comparing pre- and post-perihelion results. We found colour changes within the area, in particular brighter patches related to the presence of exposed water ice mixed to the refractory materials have been detected in the post-perihelion images.
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Alice Lucchetti, Maurizio Pajola, Sonia Fornasier, Stefano Mottola, Luca Penasa, et al.. Geomorphological and spectrophotometric analysis of Seth's circular niches on comet 67P/Churyumov–Gerasimenko using OSIRIS images. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 469 (Suppl_2), pp.S238 - S251. ⟨10.1093/mnras/stx1590⟩. ⟨insu-01574363⟩



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