Modelling of the outburst on 2015 July 29 observed with OSIRIS cameras in the Southern hemisphere of comet 67P/Churyumov–Gerasimenko

Gicquel, A. and Rose, M. and Vincent, J.-B. and Davidsson, B. and Bodewits, D. and A’Hearn, M. F. and Agarwal, J. and Fougere, N. and Sierks, H. and Bertini, I. and Lin, Z.-Y. and Barbieri, C. and Lamy, P. L. and Rodrigo, R. and Koschny, D. and Rickman, H. and Keller, H. U. and Barucci, M. A. and Bertaux, J.-L. and Besse, S. and Boudreault, S. and Cremonese, G. and Da Deppo, V. and Debei, S. and Deller, J. and De Cecco, M. and Frattin, E. and El-Maarry, M. R. and Fornasier, S. and Fulle, M. and Groussin, O. and Gutiérrez, P. J. and Gutiérrez-Marquez, P. and Güttler, C. and Höfner, S. and Hofmann, M. and Hu, X. and Hviid, S. F. and Ip, W.-H. and Jorda, L. and Knollenberg, J. and Kovacs, G. and Kramm, J.-R. and Kührt, E. and Küppers, M. and Lara, L. M. and Lazzarin, M. and Moreno, J. J. Lopez and Lowry, S.C. and Marzari, F. and Masoumzadeh, N. and Massironi, M. and Moreno, F. and Mottola, S. and Naletto, G. and Oklay, N. and Pajola, M. and Preusker, F. and Scholten, F. and Shi, X. and Thomas, N. and Toth, I. and Tubiana, C. (2017) Modelling of the outburst on 2015 July 29 observed with OSIRIS cameras in the Southern hemisphere of comet 67P/Churyumov–Gerasimenko. Monthly Notices of the Royal Astronomical Society, 469 (2). S178-S185. ISSN 0035-8711. E-ISSN 1365-2966. (doi: (Full text available)

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Images of the nucleus and the coma (gas and dust) of comet 67P/Churyumov– Gerasimenko have been acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) cameras since 2014 March using both the wide-angle camera and the narrow-angle camera (NAC). We use images from the NAC camera to study a bright outburst observed in the Southern hemisphere on 2015 July 29. The high spatial resolution of the NAC is needed to localize the source point of the outburst on the surface of the nucleus. The heliocentric distance is 1.25 au and the spacecraft–comet distance is 186 km. Aiming to better understand the physics that led to the outgassing, we used the Direct Simulation Monte Carlo method to study the gas flow close to the nucleus and the dust trajectories. The goal is to understand the mechanisms producing the outburst. We reproduce the opening angle of the outburst in the model and constrain the outgassing ratio between the outburst source and the local region. The outburst is in fact a combination of both gas and dust, in which the active surface is approximately 10 times more active than the average rate found in the surrounding areas. We need a number of dust particles 7.83 × 1011 to 6.90 × 1015 (radius 1.97–185 μm), which correspond to a mass of dust (220–21) × 103 kg.

Item Type: Article
Additional information:
Uncontrolled keywords: methods: data analysis, methods: numerical, methods: observational, comets: individual: 67P/Churyumov, Gerasimenko
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Stephen Lowry
Date Deposited: 21 Sep 2017 14:58 UTC
Last Modified: 21 Sep 2017 14:58 UTC
Resource URI: (The current URI for this page, for reference purposes)
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