Surface changes on comet 67P/Churyumov-Gerasimenko suggest a more active past

DOI: 
10.1126/science.aak9384
Publication date: 
17/04/2017
Main author: 
Ramy El-Maarry M.
IAA authors: 
Gutierrez, P.J.;Lara, L.M.;Lopez Moreno, J.J.
Authors: 
Ramy El-Maarry M., Groussin O., Thomas N., Pajola M., Auger A.-T., Davidsson B., Hu X., Hviid S.F., Knollenberg J., Güttler C., Tubiana C., Fornasier S., Feller C., Hasselmann P., Vincent J.-B., Sierks H., Barbieri C., Lamy P., Rodrigo R., Koschny D., Keller H.U., Rickman H., A'Hearn M.F., Barucci M.A., Bertaux J.-L., Bertini I., Besse S., Bodewits D., Cremonese G., Da Deppo V., Debei S., De Cecco M., Deller J., Deshapriya J.D.P., Fulle M., Gutierrez P.J., Hofmann M., Ip W.-H., Jorda L., Kovacs G., Kramm J.-R., Kührt E., Küppers M., Lara L.M., Lazzarin M., Yi Lin Z., Lopez Moreno J.J., Marchi S., Marzari F., Mottola S., Naletto G., Oklay N., Pommerol A., Preusker F., Scholten F., Shi X.
Journal: 
Science
Publication type: 
Article
Volume: 
355
Number: 
aak9384
Abstract: 

The Rosetta spacecraft spent ~2 years orbiting comet 67P/Churyumov-Gerasimenko, most of it at distances that allowed surface characterization and monitoring at submeter scales. From December 2014 to June 2016, numerous localized changes were observed, which we attribute to cometary-specific weathering, erosion, and transient events driven by exposure to sunlight and other processes. While the localized changes suggest compositional or physical heterogeneity, their scale has not resulted in substantial alterations to the comet's landscape. This suggests that most of the major landforms were created early in the comet's current orbital configuration. They may even date from earlier if the comet had a larger volatile inventory, particularly of CO or CO2 ices, or contained amorphous ice, which could have triggered activity at greater distances from the Sun.

Database: 
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85016012667&doi=10.1126%2fscience.aak9384&partnerID=40&md5=d76a7d0aaeeaddd0ebbf132c210bac39