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dc.contributor.authorRinaldi, G.
dc.contributor.authorFormisano, M.
dc.contributor.authorKappel, D.
dc.contributor.authorCapaccioni, F.
dc.contributor.authorBockelée-Morvan, D.
dc.contributor.authorCheng, Y.-C.
dc.contributor.authorVincent, J.-B.
dc.contributor.authorDeshapriya, P.
dc.contributor.authorArnold, G.
dc.contributor.authorCapria, M. T.
dc.contributor.authorCiarniello, M.
dc.contributor.authorD’Aversa, E.
dc.contributor.authorDe Sanctis, M. C.
dc.contributor.authorDoose, L.
dc.contributor.authorErard, S.
dc.contributor.authorFederico, C.
dc.contributor.authorFilacchione, G.
dc.contributor.authorFink, U.
dc.contributor.authorLeyrat, C.
dc.contributor.authorLongobardo, A.
dc.contributor.authorMagni, G.
dc.contributor.authorMigliorini, A.
dc.contributor.authorMottola, S.
dc.contributor.authorNaletto, G.
dc.contributor.authorRaponi, A.
dc.contributor.authorTaylor, F.
dc.contributor.authorTosi, F.
dc.contributor.authorTozzi, G. P.
dc.contributor.authorSalatti, M.
dc.date.accessioned2019-10-30T00:38:17Z
dc.date.available2019-10-30T00:38:17Z
dc.date.issued2019-09-20
dc.identifier.citationRinaldi, G., Formisano, M., Kappel, D., Capaccioni, F., Bockelée-Morvan, D., Cheng, Y. C., ... & Ciarniello, M. (2019). Analysis of night-side dust activity on comet 67P observed by VIRTIS-M: a new method to constrain the thermal inertia on the surface. Astronomy & Astrophysics, 630, A21.en_US
dc.identifier.issn1432-0746
dc.identifier.doi10.1051/0004-6361/201834907
dc.identifier.urihttp://hdl.handle.net/10150/634909
dc.description.abstractOn 2015 July 18, near perihelion at a heliocentric distance of 1.28 au, the Visible InfraRed Thermal Imaging Spectrometer (VIRTIS-M) on board the Rosetta spacecraft had the opportunity of observing dust activity in the inner coma with a view of the night side (shadowed side) of comet 67P/Churyumov-Gerasimenko. At the time of the measurements we present here, we observe a dust plume that originates on the far side of the nucleus. We are able to identify the approximate location of its source at the boundary between the Hapi and Anuket regions, and we find that it has been in darkness for some hours before the observation. Assuming that this time span is equal to the conductive time scale, we obtain a thermal inertia in the range 25-36 W K-1 m(-2) s(-1/2). These thermal inertia values can be used to verify with a 3D finite-element method (REM) numerical code whether the surface and subsurface temperatures agree with the values found in the literature. We explored three different configurations: (1) a layer of water ice mixed with dust beneath a dust mantle of 5 mm with thermal inertia of 36 J m(-2) K-1 S-0.5 ; (2) the same structure, but with thermal inertia of 100 J m(-2) K-1 S-0.5; (3) an ice-dust mixture that is directly exposed. Of these three configurations, the first seems to be the most reasonable, both for the low thermal inertia and for the agreement with the surface and subsurface temperatures that have been found for the comet 67P/Churyumov-Gerasimenko. The spectral properties of the plume show that the visible dust color ranged from 16 +/- 4.8%/100 nm to 13 +/- 2.6%/100 nm, indicating that this plume has no detectable color gradient. The morphology of the plume can be classified as a narrow jet that has an estimated total ejected mass of between 6 and 19 tons when we assume size distribution indices between -2.5 and -3.en_US
dc.description.sponsorshipItalian Space Agency (ASI, Italy) [I/024/12/1]; Centre National d'Etudes Spatiales (CNES, France)Centre National D'etudes Spatiales; DLR (Germany)Helmholtz AssociationGerman Aerospace Centre (DLR); NASA (USA) Rosetta Program; Science and Technology Facilities Council (UK)Science & Technology Facilities Council (STFC); ASIItalian Space Agency; Observatoire de Meudon - CNES; DLRHelmholtz AssociationGerman Aerospace Centre (DLR)en_US
dc.language.isoenen_US
dc.publisherEDP SCIENCES S Aen_US
dc.rightsCopyright © ESO 2019en_US
dc.subjectcomets: generalen_US
dc.subjectcomets: individual: 67P/Churyumov-Gerasimenkoen_US
dc.subjectinfrared: planetary systemsen_US
dc.titleAnalysis of night-side dust activity on comet 67P observed by VIRTIS-M: a new method to constrain the thermal inertia on the surfaceen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben_US
dc.identifier.journalASTRONOMY & ASTROPHYSICSen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume630
dc.source.beginpageA21
refterms.dateFOA2019-10-30T00:38:17Z


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