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Catalogue POP – Notice individuelle de publication

Gicquel Adeline, Rose M., Vincent Jean-Baptiste, Davidsson Björn, Bodewits Dennis, A'Hearn M. F., Agarwal Jessica, Fougere N., Sierks Holger, Bertini Ivano, Lin Zhong-Yi, Barbieri Cesare, Lamy Philippe, Rodrigo Rafael, Koschny Detlef, Rickman Hans, Keller Horst Uwe, Barucci Maria Antonella, Bertaux Jean-Loup, Besse Sébastien, Boudreault S., Cremonese Gabriele, Da Deppo Vania, Debei Stefano, Deller Jakob, De Cecco M., Frattin E., El-Maarry Mohamed Ramy, Fornasier Sonia, Fulle Marco, Groussin Olivier, Gutierrez Pedro J., Gutiérrez-Marquez P., Güttler Carsten, Höfner Sebastian, Hofmann M., Hu X., Hviid Stubbe F., Ip W., Jorda Laurent, Knollenberg Jörg, Kovacs Gabor, Kramm Rainer, Kührt Ekkehard, Küppers Michael, Lara Luisa M., Lazzarin Monica, Moreno J. J. Lopez, Lowry Stephen, Marzari Francesco, Masoumzadeh N., Massironi Matteo, Moreno Fernando, Mottola Stefano, Naletto Giampiero, Oklay Nilda, Pajola Maurizio, Preusker Frank, Scholten Frank, Shi X., Thomas Nicholas, Toth Imre, Tubiana Cecilia

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, 2017, vol. 469, pp. S178-S185

Référence DOI : 10.1093/mnras/stx1441
Référence ADS : 2017MNRAS.469S.178G

Résumé :

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 × 10<SUP>11</SUP> to 6.90 × 10<SUP>15</SUP> (radius 1.97-185 mum), which correspond to a mass of dust (220-21) × 10<SUP>3</SUP> kg.

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