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

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题名:	Photometry of dust grains of comet 67P and connection with nucleus regions
作者:	葉永烜;Cremonese, G.;Simioni, E.;Ragazzoni, R.;Bertini, I.;La Forgia, F.;Pajola, M.;Oklay, N.;Fornasier, S.;Lazzarin, M.;Lucchetti, A.;Sierks, H.;Barbieri, C.;Lamy, P.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;A’Hearn, M. F.;Agarwal, J.;Barucci, M. A.;Bertaux, J. -L.;Da Deppo, V.;Davidsson, B.;De Cecco, M.;Debei, S.;Fulle, M.;Groussin, O.;Güttler, C.;Gutierrez, P. J.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kramm, J.-R.;Kueppers, M.;Kürt, E.;Lara, L. M.;Magrin, S.;Lopez Moreno, J. J.;Marzari, F.;Mottola, S.;Naletto, G.;Preusker, F.;Scholten, F.;Thomas, N.;Tubiana, C.;Vincent, J.-B.
贡献者:	理學院天文研究所
关键词:	Astrophysics;Comets;comets: general;comets: individual: 67P/Churyumov-Gerasimenko;Dust;Dust control;Dust filters;Grains;Nuclei;Photometry;Physics;Sciences of the Universe;Solar and Stellar Astrophysics
日期:	2016-04-01
上传时间:	2026-04-21 14:50:55 (UTC+8)
出版者:	EDP Sciences
摘要:	摘要： Aims. 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. Methods. 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 λ = 480.7 nm and at λ = 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. Results. 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. 出版者： EDP Sciences 出版日期： 2016-04-01 出處： Astronomy and astrophysics (Berlin), 2016-04, Vol.588, p.A59 資源來源： EDP Sciences 版權： CC0 1.0 - Universal 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201527307
显示于类别:	[天文研究所] 期刊論文

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