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Analysis of night-side dust activity on comet 67P observed by VIRTIS-M: a new method to constrain the thermal inertia on the surface

Rinaldi, G. and Formisano, M. and Kappel, David and Capaccioni, F. and Bockelee-Morvan, D. and Cheng, Y.-C. and Vincent, Jean-Baptiste and Deshapriya, J. D. P. and Arnold, Gabriele and Capria, M. T. and Ciarniello, M. and D'Aversa, E. and De Sanctis, M.C. and Doose, L. and Erard, S. and Federico, C. and Filacchione, G. and Fink, U. and Leyrat, C. and Longobardo, A and Magni, G. and Migliorini, A. and Mottola, Stefano and Naletto, G. and Raponi, A and Taylor, F. and Tosi, F and Tozzi, G and Salatti, 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, pp. 1-16. EDP Sciences. DOI: 10.1051/0004-6361/201834907 ISSN 0004-6361

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Official URL: https://www.aanda.org/articles/aa/abs/2019/10/aa34907-18/aa34907-18.html

Abstract

On 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 (FEM) 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.

Item URL in elib:https://elib.dlr.de/130754/
Document Type:Article
Title:Analysis of night-side dust activity on comet 67P observed by VIRTIS-M: a new method to constrain the thermal inertia on the surface
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rinaldi, G.INAF-IASF,Rome, ItalyUNSPECIFIED
Formisano, M.INAF-IASF, ItalyUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.dehttps://orcid.org/0000-0002-0518-5548
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Cheng, Y.-C.LESIAUNSPECIFIED
Vincent, Jean-BaptisteJean-Baptiste.Vincent (at) dlr.deUNSPECIFIED
Deshapriya, J. D. P.LESIA – Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, FranceUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Ciarniello, M.inaf-iasf, italyUNSPECIFIED
D'Aversa, E.inaf-ifsi, rome, italyUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIED
Doose, L.University of ArizonaUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Federico, C.INAF-IASF,Rome, ItalyUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Fink, U.Lunar Planetary Laboratory, Univarsity of Arizona, Tucson, USAUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIED
Longobardo, Ainaf-laps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Magni, G.IASF/INAF, Rome, ItalyUNSPECIFIED
Migliorini, A.INAF-IAPS, Istituto di Astrofisica e Planetologia SpazialiUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Naletto, G.University of Padova, CISAS, via Venezia 15, 35100 Padova, ItalyUNSPECIFIED
Raponi, AINAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, Rome, ItalyUNSPECIFIED
Taylor, F.Oxford UniversityUNSPECIFIED
Tosi, FINAF-IASF, italyUNSPECIFIED
Tozzi, GIstituto Nazionale di Astrofsica (INAF) Osservatorio di Arcetri, ItalyUNSPECIFIED
Salatti, M.ASI RomUNSPECIFIED
Date:October 2019
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:630
DOI :10.1051/0004-6361/201834907
Page Range:pp. 1-16
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: general; comets: individual: 67P/Churyumov-Gerasimenko; infrared: planetary systems
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Institute of Planetary Research > Asteroids and Comets
Deposited By: Kappel, David
Deposited On:21 Nov 2019 08:40
Last Modified:27 Feb 2020 07:40

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