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The rocky‐like behavior of cometary landslides on 67P/Churyumov‐Gerasimenko

Alice Lucchetti 1 Luca Penasa 2 Maurizio Pajola 1 Matteo Massironi 3, 2, 1 Maria Teresa Brunetti 4 Gabriele Cremonese 1 Nilda Oklay 5 Jean‐baptiste Vincent 5 Stefano Mottola 5 Sonia Fornasier 6 Holger Sierks 7 Giampiero Naletto 2, 8, 9 Philippe Lamy 10 Rafael Rodrigo 11, 12 Detlef Koschny 13 Björn Davidsson 14 Cesare Barbieri 8 Maria Antonietta Barucci 6 Jean-Loup Bertaux 10 Ivano Bertini 8 Dennis Bodewits 15 Pamela Cambianica 2 Vania Da Deppo 16 Stefano Debei 17 Mariolino De Cecco 18 Jacob Deller 7 Sabrina Ferrari 2 Francesca Ferri 2 Marco Franceschi 3 Marco Fulle 19 Pedro Gutiérrez 20 Carsten Güttler 7 Wing‐h. Ip 21, 22 Uwe Keller 23, 5 Luisa Lara 20 Monica Lazzarin 8 Jose Lopez Moreno 20 Francesco Marzari 8 Cécilia Tubiana 7
Abstract : Landslides have been identified on several Solar System bodies and different mechanisms have been proposed to explain their runout length. We analyse images from the Rosetta mission and report the global characterisation of such features on comet 67P/Churyumov‐Gerasimenko's surface. By assuming the height to runout length as an approximation for the friction coefficient of landslide material, we find that on comet 67P, this ratio falls between 0.50 and 0.97. Such unexpected high values reveal a rocky‐type mechanical behaviour that is much more akin to Earth dry landslides than to icy satellites' mass movements. This behaviour indicates that 67P and likely comets in general are characterised by consolidated materials possibly rejecting the idea that they are fluffy aggregates. The variability of the runout length among 67P landslides can be attributed to the different volatile content located in the top few meters of the cometary crust, which can drive the mass movement.
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Submitted on : Thursday, December 19, 2019 - 9:40:16 AM
Last modification on : Friday, April 10, 2020 - 5:16:46 PM

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Alice Lucchetti, Luca Penasa, Maurizio Pajola, Matteo Massironi, Maria Teresa Brunetti, et al.. The rocky‐like behavior of cometary landslides on 67P/Churyumov‐Gerasimenko. Geophysical Research Letters, American Geophysical Union, 2019, 46 (24), pp.14336-14346. ⟨10.1029/2019GL085132⟩. ⟨insu-02418689⟩

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