2024-03-28T23:09:22Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1462752021-10-27T11:25:13Zcom_10261_97com_10261_4col_10261_350
2017-03-07T09:54:57Z
urn:hdl:10261/146275
Are fractured cliffs the source of cometary dust jets? Insights from OSIRIS/Rosetta at 67P/Churyumov-Gerasimenko
Vincent, J.B.
Rodrigo, R.
Gutiérrez, Pedro J.
Lara, Luisa María
López-Moreno, José Juan
Moreno, Fernando
Naletto, G.
European Space Agency
Centre National D'Etudes Spatiales (France)
European Space Agency
Agenzia Spaziale Italiana
Swedish National Space Agency
Ministerio de Economía y Competitividad (España)
German Centre for Air and Space Travel
Comets: general
Comets: individual: 67P/Churyumov-Gerasimenko
Context. 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 yet their formation mechanism remains unknown. Several solutions have been proposed involving either specific properties of the active areas or the local topography to create and focus the gas and dust flows. While the nucleus morphology seems to be responsible for the larger features, high resolution imagery has shown that broad streams are composed of many smaller jets (a few meters wide) that connect directly to the nucleus surface. Aims. We monitored these jets at high resolution and over several months to understand what the physical processes are that drive their formation and how this affects the surface. Methods. Using many images of the same areas with different viewing angles, we performed a 3-dimensional reconstruction of collimated jets and linked them precisely to their sources on the nucleus. Results. We show here observational evidence that the northern hemisphere jets of comet 67P/Churyumov-Gerasimenko arise from areas with sharp topographic changes and describe the physical processes involved. We propose a model in which active cliffs are the main source of jet-like features and therefore of the regions eroding the fastest on comets. We suggest that this is a common mechanism taking place on all comets.
2017-03-07T09:54:57Z
2017-03-07T09:54:57Z
2016
2017-03-07T09:54:57Z
artículo
http://hdl.handle.net/10261/146275
10.1051/0004-6361/201527159
http://dx.doi.org/10.13039/501100000844
http://dx.doi.org/10.13039/501100002946
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100001859
http://dx.doi.org/10.13039/501100002830
http://dx.doi.org/10.13039/501100003981
eng
Publisher's version
http://doi.org/10.1051/0004-6361/201527159
Sí
openAccess