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Photometry of dust grains of comet 67P and connection with nucleus regions

Gabriele Cremonese 1 Emanuele Simioni 1, 2 Roberto Ragazzoni 1 Ivano Bertini 3 Fiorangela La Forgia 4 Maurizio Pajola 3 Nilda Oklay 5 Sonia Fornasier 6 Monica Lazzarin 4 Alice Lucchetti 1, 3 Holger Sierks 5 Cesare Barbieri 4 Philippe Lamy 7 Rafael Rodrigo 8, 9 Detlef Koschny 10 Hans Rickman 11, 12 Horst U. Keller 13 Michael F. A'Hearn 14 Jessica Agarwal 5 Maria Antonella Barucci 6 Jean-Loup Bertaux 15 Vania da Deppo 2 Björn Davidsson 12 Mariolino de Cecco 16 Stefano Debei 17 Marco Fulle 18 Olivier Groussin 7 Carsten Güttler 5 Pedro J. Gutiérrez 19 Stubbe F. Hviid 20 Wing-Huen Ip 21 Laurent Jorda 7 Jörg Knollenberg 20 J.-Rainer Kramm 5 Michael Kueppers 22 Ekkehard Kührt 20 Luisa M. Lara 19 Sara Magrin 4 Jose J. Lopez Moreno 19 Francesco Marzari 4 Stefano Mottola 20 Giampiero Naletto 3, 2, 23 Frank Preusker 20 Frank Scholten 20 Nicholas Thomas 24 Cécilia Tubiana 5 Jean-Baptiste Vincent 5
Abstract : Multiple pairs of high-resolution images of the dust coma of comet 67P/Churyumov-Gerasimenko have been collected by OSIRIS onboard Rosetta allowing extraction and analysis of dust grain tracks. We developed a quasi automatic method to recognize and to extract dust tracks in the Osiris images providing size, FWHM and photometric data. The dust tracks characterized by a low signal-to-noise ratio were checked manually. We performed the photometric analysis of 70 dust grain tracks observed on two different Narrow Angle Camera images in the two filters F24 and F28, centered at lambda = 480.7 nm and at lambda = 743.7 nm, respectively, deriving the color and the reddening of each one. We then extracted several images of the nucleus observed with the same filters and with the same phase angle to be compared with the dust grain reddening. Most of the dust grain reddening is very similar to the nucleus values, confirming they come from the surface or subsurface layer. The histogram of the dust grain reddening has a secondary peak at negative values and shows some grains with values higher than the nucleus, suggesting a different composition from the surface grains. One hypothesis comes from the negative values point at the presence of hydrated minerals in the comet.
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Submitted on : Thursday, January 19, 2017 - 1:43:04 PM
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Gabriele Cremonese, Emanuele Simioni, Roberto Ragazzoni, Ivano Bertini, Fiorangela La Forgia, et al.. Photometry of dust grains of comet 67P and connection with nucleus regions. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 588, A59 (8 p.). ⟨10.1051/0004-6361/201527307⟩. ⟨hal-01440715⟩



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