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  Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta

Tubiana, C., Rinaldi, G., Güttler, C., Snodgrass, C., Shi, X., Hu, X., et al. (2019). Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta. Astronomy and Astrophysics, 630: A23. doi:10.1051/0004-6361/201834869.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-0AB1-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-0AB2-7
Genre: Journal Article

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Tubiana, Cecilia1, Author              
Rinaldi, G., Author
Güttler, Carsten1, Author              
Snodgrass, C., Author
Shi, Xian1, Author              
Hu, X., Author
Marschall, R., Author
Fulle, M., Author
Bockelée-Morvan, D., Author
Naletto, G., Author
Capaccioni, F., Author
Sierks, Holger1, Author              
Arnold, G., Author
Barucci, M. A., Author
Bertaux, J.-L., Author
Bertini, I., Author
Bodewits, D., Author
Capria, M. T., Author
Ciarniello, M., Author
Cremonese, G., Author
Crovisier, J., AuthorDa Deppo, V. , AuthorDebei, S., AuthorDe Cecco, M. , AuthorDeller, Jakob1, Author              De Sanctis, M. C. , AuthorDavidsson, B., AuthorDoose, L., AuthorErard, S., AuthorFilacchione, G., AuthorFink, U., AuthorFormisano, M., AuthorFornasier, S., AuthorGutiérrez, P. J., AuthorIp, W.-H., AuthorIvanovski, S., AuthorKappel, D., AuthorKeller, H. U., AuthorKolokolova, L., AuthorKoschny, D., AuthorKrüger, Harald1, Author              La Forgia, F., AuthorLamy, P. L., AuthorLara, L. M., AuthorLazzarin, M., AuthorLevasseur-Regourd, A. C., AuthorLin, Z.-Y., AuthorLongobardo, A., AuthorLópez-Moreno, J. J., AuthorMarzari, F., AuthorMigliorini, A., AuthorMottola, S., AuthorRodrigo, R., AuthorTaylor, F., AuthorToth, I., AuthorZakharov, V., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: comets: general / comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: Context. On 27 April 2015, when comet 67P/Churyumov-Gerasimenko was at 1.76 au from the Sun and moving toward perihelion, the OSIRIS and VIRTIS-M instruments on board the Rosetta spacecraft simultaneously observed the evolving dust and gas coma during a complete rotation of the comet. Aims. We aim to characterize the spatial distribution of dust, H2O, and CO2 gas in the inner coma. To do this, we performed a quantitative analysis of the release of dust and gas and compared the observed H2O production rate with the rate we calculated using a thermophysical model. Methods. For this study we selected OSIRIS WAC images at 612 nm (dust) and VIRTIS-M image cubes at 612 nm, 2700 nm (H2O emission band), and 4200 nm (CO2 emission band). We measured the average signal in a circular annulus to study the spatial variation around the comet, and in a sector of the annulus to study temporal variation in the sunward direction with comet rotation, both at a fixed distance of 3.1 km from the comet center. Results. The spatial correlation between dust and water, both coming from the sunlit side of the comet, shows that water is the main driver of dust activity in this time period. The spatial distribution of CO2 is not correlated with water and dust. There is no strong temporal correlation between the dust brightness and water production rate as the comet rotates. The dust brightness shows a peak at 0° subsolar longitude, which is not pronounced in the water production. At the same epoch, there is also a maximum in CO2 production. An excess of measured water production with respect to the value calculated using a simple thermophysical model is observed when the head lobe and regions of the southern hemisphere with strong seasonal variations are illuminated (subsolar longitude 270°–50°). A drastic decrease in dust production when the water production (both measured and from the model) displays a maximum occurs when typical northern consolidated regions are illuminated and the southern hemisphere regions with strong seasonal variations are instead in shadow (subsolar longitude 50°–90°). Possible explanations of these observations are presented and discussed.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201834869
arXiv: 1905.03022
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 630 Sequence Number: A23 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1