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Sublimation of icy aggregates in the coma of comet 67p/churyumov-gerasimenko detected with the osiris cameras on board rosetta

Gicquel, A., Vincent, J.-B., Agarwal, J., A'Hearn, M. F., Bertini, I., Bodewits, D., Sierks, H., Lin, Z.-Y., Barbieri, C., Lamy, P. L., and others. (2016) Sublimation of icy aggregates in the coma of comet 67p/churyumov-gerasimenko detected with the osiris cameras on board rosetta. Monthly Notices of the Royal Astronomical Society, 462 . S57-S66. ISSN 0035-8711. (doi:10.1093/mnras/stw2117) (KAR id:63510)

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Beginning in 2014 March, the OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) cameras began capturing images of the nucleus and coma (gas and dust) of comet 67P/Churyumov-Gerasimenko using both the wide angle camera (WAC) and the narrow angle camera (NAC). The many observations taken since July of 2014 have been used to study the morphology, location, and temporal variation of the comet's dust jets. We analysed the dust monitoring observations shortly after the southern vernal equinox on 2015 May 30 and 31 with theWAC at the heliocentric distance Rh = 1.53 AU, where it is possible to observe that the jet rotates with the nucleus. We found that the decline of brightness as a function of the distance of the jet is much steeper than the background coma, which is a first indication of sublimation. We adapted a model of sublimation of icy aggregates and studied the effect as a function of the physical properties of the aggregates (composition and size). The major finding of this paper was that through the sublimation of the aggregates of dirty grains (radius a between 5 and 50 Œºm) we were able to completely reproduce the radial brightness profile of a jet beyond 4 km from the nucleus. To reproduce the data, we needed to inject a number of aggregates between 8.5 ?ó 1013 and 8.5 ?ó 1010 for a = 5 and 50 Œºm, respectively, or an initial mass of H2O ice around 22 kg. ¬© 2016 The Authors.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stw2117
Additional information: cited By 3
Subjects: Q Science > QB Astronomy > QB651 Planets, Minor
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Stephen Lowry
Date Deposited: 21 Sep 2017 11:00 UTC
Last Modified: 03 Sep 2021 14:00 UTC
Resource URI: (The current URI for this page, for reference purposes)
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