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

I.-L. Lai 1 W.-H. Ip 2, 1, 3 J.-C. Lee 4 Z.-Y. Lin 2 J.-B. Vincent 5 N. Oklay 5 H. Sierks 6 C. Barbieri 7 Philippe Lamy 8, 9 R. Rodrigo 10, 11 D. Koschny 12 H. Rickman 13, 14 H. U. Keller 15 J. Agarwal 6 M. A. Barucci 16 Jean-Loup Bertaux 8 I. Bertini 17 Dennis Bodewits 18 S. Boudreault 6 G. Cremonese 19 V. Da Deppo 20 Björn Davidsson 14 Stefano Debei 21 M. de Cecco 22 Jakob Deller 6 Sonia Fornasier 16 Marco Fulle 23 Olivier Groussin 9 Pedro J. Gutiérrez 24 Carsten Güttler 6 M. Hofmann 6 Stubbe F. Hviid 5 Laurent Jorda 9 Jörg Knollenberg 5 Gabor Kovacs 6 Jörg-Rainer Kramm 6 Ekkehard Kührt 5 M. Küppers 25 Luisa Maria Lara 24 Monica Lazzarin 10 Josè J. Lopez-Moreno 24 Francesco Marzari 7 Giampiero Naletto 17 X. Shi 6 Cécilia Tubiana 6 Nicolas Thomas 26
Abstract : 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. 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. 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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Submitted on : Wednesday, November 7, 2018 - 5:51:43 PM
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I.-L. Lai, W.-H. Ip, J.-C. Lee, Z.-Y. Lin, J.-B. Vincent, et al.. Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics - A&A, EDP Sciences, 2019, 630, A17 (10 p.). ⟨10.1051/0004-6361/201732094⟩. ⟨insu-01915612⟩



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