气候变化领域集成服务门户(CCPortal): 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

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DOI	10.1051/0004-6361/201834869
	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.; Marschall R.; Fulle M.; Bockelée-Morvan D.; Naletto G.; Capaccioni F.; Sierks H.; Arnold G.; Barucci M.A.; Bertaux J.-L.; Bertini I.; Bodewits D.; Capria M.T.; Ciarniello M.; Cremonese G.; Crovisier J.; Da Deppo V.; Debei S.; De Cecco M.; Deller J.; De Sanctis M.C.; Davidsson B.; Doose L.; Erard S.; Filacchione G.; Fink U.; Formisano M.; Fornasier S.; Gutiérrez P.J.; Ip W.-H.; Ivanovski S.; Kappel D.; Keller H.U.; Kolokolova L.; Koschny D.; Krueger H.; La Forgia F.; Lamy P.L.; Lara L.M.; Lazzarin M.; Levasseur-Regourd A.C.; Lin Z.-Y.; Longobardo A.; López-Moreno J.J.; Marzari F.; Migliorini A.; Mottola S.; Rodrigo R.; Taylor F.; Toth I.; Zakharov V.
发表日期	2019
ISSN	46361
卷号	630
英文摘要	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 insteadin shadow (subsolar longitude 50°-90°). Possible explanations of these observations are presented and discussed. © C. Tubiana et al. 2019.
英文关键词	67P/Churyumov-Gerasimenko; Comets; Comets; Data analysis; General; Individual; Methods
scopus关键词	Carbon dioxide; Data reduction; Luminance; Spatial distribution; 67p/churyumov-gerasimenko; Comets; General; Individual; Methods; Dust
来源期刊	Astronomy and Astrophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176340
作者单位	Max Planck Institute for Solar System Research, Göttingen, Germany; Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, Rome, Italy; Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh, EH9 3HJ, United Kingdom; Institute for Geodesy and Geoinformation Science, Technical University Berlin, Straße des 17. Juni 135, Berlin, 10623, Germany; International Space Science Institute, Bern, Switzerland; INAF - Osservatorio Astronomico, Trieste, Italy; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne, Université, Université Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, Meudon, 92195, France; Department of Physics, Oxford University, Oxford, United Kingdom; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Berlin, Germany; Lunar and Planetary Laboratory, University of Arizona, Tucson, United States; Physics Department, Auburn University, Auburn, AL 36849, United States; Laboratoire Atmosphères,...
推荐引用方式 GB/T 7714	Tubiana C.,Rinaldi G.,Güttler C.,et al. 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[J],2019,630.
APA	Tubiana C..,Rinaldi G..,Güttler C..,Snodgrass C..,Shi X..,...&Zakharov V..(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.
MLA	Tubiana C.,et al."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(2019).