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

Adeline Gicquel 1 Martin Rose 2 Jean-Baptiste Vincent 3 Björn Davidsson 4 Dennis Bodewits 5 Michael F. A'Hearn 5 Jessica Agarwal 1 Nicolas Fougere 6 Holger Sierks 1 Ivano Bertini 7 Zhong-yi Lin 8 Cesare Barbieri 9 Philippe L. Lamy 10 Rafael Rodrigo 11, 12 Detlef Koschny 13 Hans Rickman 14, 15 Horst Uwe Keller 16 Maria Antonella Barucci 17 Jean-Loup Bertaux 18 Sebastien Besse 19 Steve Boudreault 1 Gabriele Cremonese 20 Vania da Deppo 21 Stefano Debei 22 Jakob Deller 1 Mariolino de Cecco 23 Elisa Frattin 20 Mohamed Ramy El-Maarry 24 Sonia Fornasier 17 Marco Fulle 25 Olivier Groussin 10 Pedro J. Gutiérrez 26 Pablo Gutiérrez-Marquez 1 Carsten Güttler 1 Sebastien Höfner 1 Marc Hofmann 1 Xuanyu Hu 1 Stubbe F. Hviid 3 Wing-Huen Ip 8 Laurent Jorda 10 Jörg Knollenberg 3 Gabor Kovacs 27, 1 J.-Rainer Kramm 1 Ekkehard Kührt 3 Michael Küppers 28 Luisa M. Lara 26 Monica Lazzarin 9 José J. Lopez Moreno 26 Stephen C. Lowry 29 Francesco Marzari 9 Nafiseh Masoumzadeh 1 Matteo Massironi 7 Fernando Moreno 26 Stefano Mottola 3 Giampiero Naletto 23, 7, 30 Nilda Oklay 3 Maurizio Pajola 31 Frank Preusker 3 Frank Scholten 3 Xian Shi 1 Nicolas Thomas 24 Imre Toth 32, 10 Cécilia Tubiana 1 
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : 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.
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Adeline Gicquel, Martin Rose, Jean-Baptiste Vincent, Björn Davidsson, Dennis Bodewits, et al.. 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, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 469 (Suppl_2), pp.S178 - S185. ⟨10.1093/mnras/stx1441⟩. ⟨insu-01574314⟩



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