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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. und Rinaldi, G. und Erard, S. und Leyrat, C. und Capaccioni, F. und Drossart, P. und Filacchione, G. und Migliorini, A. und Quirico, E. und Mottola, Stefano und Tozzi, G. und Arnold, Gabriele und Biver, N und Combes, M. und Crovisier, J. und Longobardo, A und Blecka, M. und 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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Offizielle URL: https://academic.oup.com/mnras/article/469/Suppl_2/S443/4060719

Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/126090/
Dokumentart:Zeitschriftenbeitrag
Titel:Comet 67P outbursts and quiescent coma at 1.3 au from the Sun: dust properties from Rosetta/VIRTIS-H observations
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Bockelee-Morvan, D.Observatoire de Paris, Meudon
Rinaldi, G.Istituto di Fisica dello Spazio Interplanetario (IFSI-INAF), Rome - Italy
Erard, S.LESIA
Leyrat, C.LESIA
Capaccioni, F.INAF-IASF, italy
Drossart, P.Observatoire de Paris, Meudon, France
Filacchione, G.INAF-IASF, Rome, Italy
Migliorini, A.INAF-IASF
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier University
Mottola, StefanoStefano.Mottola (at) dlr.dehttps://orcid.org/0000-0002-0457-3872
Tozzi, G.Osservatorio Astrofisico di Arcetri, Firenze, Italy
Arnold, GabrieleGabriele.Arnold (at) dlr.de
Biver, NObservatoire de Paris
Combes, M.Observatoire de Paris, Meudon, France
Crovisier, J.Observatoire de Paris-Meudon, France
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, Italy
Blecka, M.Polish Academi of Sciences, Warsaw, Poland
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, Italy
Datum:2 August 2017
Erschienen in:Monthly Notices of the Royal Astronomical Society
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:469
DOI:10.1093/mnras/stx1950
Seitenbereich:S443-S458
Verlag:Oxford University Press
Name der Reihe:Monthly Notices of the Royal Astronomical Society
ISSN:0035-8711
Status:veröffentlicht
Stichwörter:comets: general, comets: individual: 67P/Churyumov-Gerasimenko, infrared: planetary systems
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt ROSETTA Instrumente (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Leitungsbereich PF
Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Kappel, David
Hinterlegt am:04 Feb 2019 09:44
Letzte Änderung:28 Mär 2023 23:53

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