Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse

@article{Vincent2015LargeHI,
  title={Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse},
  author={J.-B. Vincent and Dennis Bodewits and S{\'e}bastien Besse and Holger Sierks and Cesare Barbieri and Philippe Lamy and R. Rodrigo and Detlef Koschny and Hans Rickman and H. Uwe Keller and Jessica Agarwal and Michael F. A’Hearn and A-T Auger and M. A. Barucci and J L Bertaux and Ivano Bertini and Claire Capanna and Gabriele Cremonese and Vania Da Deppo and Bj{\"o}rn J R Davidsson and Stefano Debei and Mariolino De Cecco and M. R. El-Maarry and Francesca Ferri and Sonia Fornasier and Marco Fulle and R. W. Gaskell and Lorenza Giacomini and O. Groussin and Aur'elie Guilbert-Lepoutre and Pablo Gutierrez-Marques and Pedro J. Guti{\'e}rrez and C. G{\"u}ttler and N. M. Hoekzema and Sebastian H{\"o}fner and S F Hviid and Wing-H. Ip and Laurent Jorda and J Knollenberg and Gabor Kovacs and Rainer Kramm and E. K{\"u}hrt and Michael K{\"u}ppers and Fiorangela La Forgia and Luisa Maria Lara and Monica Lazzarin and Vicky Lee and C{\'e}dric Leyrat and Zhong-Yi Lin and Jos{\'e} Juan Lopez Moreno and S C Lowry and Sara Magrin and Lucie Maquet and Simone Marchi and Francesco Marzari and Matteo Massironi and Harald Michalik and Richard Moissl and Stefano Mottola and Giampiero Naletto and N. Oklay and Maurizio Pajola and Frank Preusker and Frank Scholten and Nicolas Thomas and Imre P{\'e}ter T{\'o}th and Cecilia Tubiana},
  journal={Nature},
  year={2015},
  volume={523},
  pages={63-66}
}
Pits have been observed on many cometary nuclei mapped by spacecraft. It has been argued that cometary pits are a signature of endogenic activity, rather than impact craters such as those on planetary and asteroid surfaces. Impact experiments and models cannot reproduce the shapes of most of the observed cometary pits, and the predicted collision rates imply that few of the pits are related to impacts. Alternative mechanisms like explosive activity have been suggested, but the driving process… Expand
Evidence for geologic processes on comets
Spacecraft missions have resolved the nuclei of six periodic comets and revealed a set of geologically intriguing and active small bodies. The shapes of these cometary nuclei are dominantly bilobateExpand
Planetary science: Sink holes and dust jets on comet 67P
TLDR
The pits on comet 67P/Churyumov–Gerasimenko are shown to be active and probably created by a sinkhole process and it is proposed that after formation, the pits expand slowly in diameter with sublimation-driven retreat of the walls. Expand
Migrating Scarps as a Significant Driver for Cometary Surface Evolution
Rosetta observations of 67P/Churyumov-Gerasimenko (67P) reveal that most changes occur in the fallback-generated smooth terrains, vast deposits of granular material blanketing the comet's northernExpand
Are fractured cliffs the source of cometary dust jets ? insights from OSIRIS/Rosetta at 67P/Churyumov-Gerasimenko
Dust jets (i.e., fuzzy collimated streams of cometary material arising from the nucleus) have been observed in situ on all comets since the Giotto mission flew by comet 1P/Halley in 1986, and yetExpand
Modelling the evolution of a comet subsurface: implications for 67P/Churyumov–Gerasimenko
Modelling the evolution of comets is a complex task aiming at providing constraints on physical processes and internal properties that are inaccessible to observations, although they couldExpand
Catastrophic disruptions as the origin of bilobate comets
Several comets observed at close range have bilobate shapes1, including comet 67P/Churyumov–Gerasimenko (67P/C–G), which was imaged by the European Space Agency’s Rosetta mission2,3. Bilobate cometsExpand
The primordial nucleus of comet 67P/Churyumov-Gerasimenko
We investigate the formation and evolution of comet nuclei and other trans-Neptunian objects (TNOs) in the solar nebula and primordial disk prior to the giant planet orbit instability foreseen by theExpand
Low velocity collisions of porous planetesimals in the early solar system
Abstract The ESA Rosetta mission has shown that Comet 67P/Churuymov–Gerasimenko is bi-lobed, has a high average porosity of around 70%, does not have internal cavities on size scales larger than 10Expand
Pits formation from volatile outgassing on 67P/Churyumov-Gerasimenko
We investigate the thermal evolution of comet 67P/Churyumov-Gerasimenko's subsurface in the Seth_01 region, where active pits have been observed by the ESA/Rosetta mission. Our simulations show thatExpand
Surface Morphology of Comets and Associated Evolutionary Processes: A Review of Rosetta’s Observations of 67P/Churyumov–Gerasimenko
Comets can be regarded as active planetary bodies because they display evidence for nearly all fundamental geological processes, which include impact cratering, tectonism, and erosion. Comets alsoExpand
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