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67P/C-G Inner Coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun

Vincenzo Della corte 1 Alessandra Rotundi 2, 1 Marco Fulle 3 Stavro Ivanovski 1 Simon F. Green 4 Frans J. M. Rietmeijer 5 Luigi Colangeli 6 Pasquale Palumbo 2, 1 Roberto Sordini 1 Marco Ferrari 1 Mario Accolla 7 V. Zakharov 8 E. Mazzotta Epifani 9 P. Weissman 10 E. Gruen 11 J. J. Lopez-Moreno 12 J. Rodriguez 12 E. Bussoletti 2 Jean-François Crifo 13 Francesca Esposito 14 P. L. Lamy 15 J. A. M. Mcdonnell 16, 4 Vito Mennella 14 A. Molina 17 R. Morales 12 F. Moreno 12 E. Palomba 1 J. M. Perrin 18, 15 R. Rodrigo 19, 20 J. C. Zarnecki 20 M. Cosi 21 F. Giovane 22 B. Gustafson 23 J. L. Ortiz 12 J. M. Jeronimo 12 M. R. Leese 24 M. Herranz 12 V. Liuzzi 2 A. C. Lopez-Jimenez 12 
Abstract : GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure the momentum, mass and speed of individual dust particles escaping the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter 67P). From August 2014 to June 2016 Rosetta escorted comet 67P during its journey around the Sun. Here we focus on GIADA data taken between 2015 January and 2016 February which included 67P's perihelion passage. To better understand cometary activity and more specifically the presence of dust structures in cometary comae, we mapped the spatial distribution of dust density in 67P's coma. In this manner we could track the evolution of high density regions of coma dust and their connections with nucleus illumination conditions, namely tracking 67P's seasons. We also studied the link between dust particle speeds and their masses with respect to heliocentric distance, i.e. the level of cometary activity. This allowed us to derive a global and a local correlation of the dust particles’ speed distribution with respect to the H2O production rate.
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Vincenzo Della corte, Alessandra Rotundi, Marco Fulle, Stavro Ivanovski, Simon F. Green, et al.. 67P/C-G Inner Coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (Suppl. 1), pp.S210-S219. ⟨10.1093/mnras/stw2529⟩. ⟨insu-01376669⟩



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