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Frattin E., Cremonese Gabriele, Simioni Emanuele, Bertini Ivano, Lazzarin Monica, Ott Thomas, Drolshagen E., La Forgia Fiorangela, Sierks Holger, Barbieri Cesare, Lamy Philippe, Rodrigo Rafael, Koschny Detlef, Rickman Hans, Keller Horst Uwe, Agarwal Jessica, A'Hearn M. F., Barucci Maria Antonella, Bertaux Jean-Loup, Da Deppo Vania, Davidsson Björn, Debei Stefano, De Cecco M., Deller Jakob, Ferrari S., Ferri Francesca, Fornasier Sonia, Fulle Marco, Gicquel Adeline, Groussin Olivier, Gutierrez Pedro J., Güttler Carsten, Hofmann M., Hviid Stubbe F., Ip W., Jorda Laurent, Knollenberg Jörg, Kramm Rainer, Kührt Ekkehard, Küppers Michael, Lara Luisa M., López-Moreno José J., Lucchetti Alice, Marzari Francesco, Massironi Matteo, Mottola Stefano, Naletto Giampiero, Oklay Nilda, Pajola Maurizio, Penasa Luca, Shi X., Thomas Nicholas, Tubiana Cecilia, Vincent Jean-Baptiste

Post-perihelion photometry of dust grains in the coma of 67P Churyumov-Gerasimenko

Monthly notices of the Royal Astronomical Society, 2017, vol. 469, pp. S195-S203

Référence DOI : 10.1093/mnras/stx1395
Référence ADS : 2017MNRAS.469S.195F

Résumé :

We present a photometric analysis of individual dust grains in the coma of comet 67P/Churyumov-Gerasimenko using OSIRIS images taken from 2015 July to 2016 January. We analysed a sample of 555 taken during 18 d at heliocentric distances ranging between 1.25 and 2.04 au and at nucleocentric distances between 80 and 437 km. An automated method to detect the tracks was specifically developed. The images were taken by OSIRIS NAC in four different filters: Near-IR (882 nm), Orange (649 nm), FarOrange (649 nm) and Blue (480 nm). It was not always possible to recognize all the grains in the four filters, hence we measured the spectral slope in two wavelengths ranges: in the interval [480-649] nm, for 1179 grains, and in the interval [649-882] nm, for 746 grains. We studied the evolution of the two populations' average spectral slopes. The data result scattered around the average value in the range [480-649] nm, while in the [649-882] nm we observe a slight decreasing moving away from the Sun as well as a slight increasing with the nucleocentric distance. A spectrophotometric analysis was performed on a subsample of 339 grains. Three major groups were defined, based on the spectral slope between [535-882] nm: (I) the steep spectra that may be related with organic material, (II) the spectra with an intermediate slope, likely a mixture of silicates and organics and (III) flat spectra that may be associated with a high abundance of water ice.

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