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Comet 67P outbursts and quiescent coma at 1.3 au from the Sun: dust properties from Rosetta/VIRTIS-H observations

Bockelee-Morvan, D. and Rinaldi, G. and Erard, S. and Leyrat, C. and Capaccioni, F. and Drossart, P. and Filacchione, G. and Migliorini, A. and Quirico, E. and Mottola, Stefano and Tozzi, G. and Arnold, Gabriele and Biver, N and Combes, M. and Crovisier, J. and Longobardo, A and Blecka, M. and Capria, M. T. (2017) Comet 67P outbursts and quiescent coma at 1.3 au from the Sun: dust properties from Rosetta/VIRTIS-H observations. Monthly Notices of the Royal Astronomical Society, 469, S443-S458. Oxford University Press. doi: 10.1093/mnras/stx1950. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/469/Suppl_2/S443/4060719


We present 2-5 μm spectroscopic observations of the dust coma of 67P/Churyumov-Gerasimenko obtained with the VIRTIS-H instrument onboard Rosetta during two outbursts that occurred on 2015, 13 September 13.6 h ut and 14 September 18.8 h ut at 1.3 au from the Sun. Scattering and thermal properties measured before the outburst are in the mean of values measured for moderately active comets. The colour temperature excess (or superheat factor) can be attributed to submicrometre-sized particles composed of absorbing material or to porous fractal-like aggregates such as those collected by the Rosetta in situ dust instruments. The power-law index of the dust size distribution is in the range 2-3. The sudden increase of infrared emission associated with the outbursts is correlated with a large increase of the colour temperature (from 300 to 630 K) and a change of the dust colour at 2-2.5 μm from red to blue colours, revealing the presence of very small grains (<=100 nm) in the outburst material. In addition, the measured large bolometric albedos (∼0.7) indicate bright grains in the ejecta, which could either be silicatic grains, implying the thermal degradation of the carbonaceous material, or icy grains. The 3 μm absorption band from water ice is not detected in the spectra acquired during the outbursts, whereas signatures of organic compounds near 3.4 μm are observed in emission. The H2O 2.7 μm and CO2 4.3 μm vibrational bands do not show any enhancement during the outbursts.

Item URL in elib:https://elib.dlr.de/126090/
Document Type:Article
Title:Comet 67P outbursts and quiescent coma at 1.3 au from the Sun: dust properties from Rosetta/VIRTIS-H observations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Rinaldi, G.Istituto di Fisica dello Spazio Interplanetario (IFSI-INAF), Rome - ItalyUNSPECIFIED
Drossart, P.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Tozzi, G.Osservatorio Astrofisico di Arcetri, Firenze, ItalyUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Biver, NObservatoire de ParisUNSPECIFIED
Combes, M.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Crovisier, J.Observatoire de Paris-Meudon, FranceUNSPECIFIED
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIED
Blecka, M.Polish Academi of Sciences, Warsaw, PolandUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Date:2 August 2017
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1093/mnras/stx1950
Page Range:S443-S458
Publisher:Oxford University Press
Series Name:Monthly Notices of the Royal Astronomical Society
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 Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments
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:04 Feb 2019 09:44
Last Modified:31 Jul 2019 20:24

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