Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko

Aims. We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time. Methods. The dust jet source regions were traced by the comprehensive imaging data set provided by the OSIRIS scientific camera. Results. We show in detail how t...

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Bibliographic Details
Authors: Lai, I. L., Ip, W. H., Lee, J. C., Lin, Z. Y., Vicent, J. B., Oklay, N., Sierks, H., Barbieri, C., Lamy, Philippe, Rodrigo, Rafael, Koschny, D., Rickman, H., Keller, H. U., Agarwal, J., Barucci, M. A., Bertaux, J. L., Bertini, I., Bodewits, D., Boudreault, S., Cremonese, G., Da Deppo, V., Davidsson, B. J. R., Debei, S., De Cecco, M., Deller, J., Fornasier, S., Fulle, M., Groussin, O., Gutiérrez, Pedro J., Güttler, C., Hofmann, M., Hviid, S. F., Jorda, L., Knollenberg, J., Kovács, G., kramm, J. R., Kührt, E., Küppers, M., Lara, L. M., Lazzarin, M., López Moreno, J. J., Marzari, F., Naletto, G., Shi, X., Tubiana, C., Thomas, N.
Format: article
Status:Published version
Publication Date:2019
Country:España
Institution:Instituto Nacional de Técnica Aeroespacial (INTA)
Repository:DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
OAI Identifier:oai:digital.inta.es:20.500.12666/371
Online Access:https://www.aanda.org/articles/aa/full_html/2019/10/aa32094-17/aa32094-17.html
http://hdl.handle.net/20.500.12666/371
Access Level:Open access
Keyword:Comets: individuals: 67P
Churyumov-Gerasimenko
Description
Summary:Aims. We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time. Methods. The dust jet source regions were traced by the comprehensive imaging data set provided by the OSIRIS scientific camera. Results. We show in detail how the projected footpoints of the dust jets and hence the outgassing zone would move in consonance with the sunlit belt. Furthermore, a number of source regions characterized by repeated jet activity might be the result of local topographical variations or compositional heterogeneities. Conclusions. The spatial and temporal variations in source regions of the dust jets are influenced significantly by the seasonal effect. The strong dependence on the solar zenith angle and local time could be related to the gas sublimation process driven by solar insolation on a surface layer of low thermal inertia.

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