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The outburst sequence of 67/P on 2015 September 13 as seen by VIRTIS/Rosetta

Rinaldi, G. and Bockelee-Morvan, D. and Leyrat, C. and Capaccioni, F. and Filacchione, G. and Erard, S. and Steckloff, Jordan and Tozzi, G. and Fink, U. and Doose, Lyn and Piccioni, G. and Capria, M. T. and Combi, M. and Desanctis, M.C. and Kappel, David and Longobardo, A and Migliorini, A. and Palomba, E. and Taylor, F.W. and Tosi, F. (2016) The outburst sequence of 67/P on 2015 September 13 as seen by VIRTIS/Rosetta. In: Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC), 48, 206.05-206.05. Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC), 16.-21. Oct. 2016, Pasadena, CA, USA.

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Official URL: https://aas.org/meetings/dps48

Abstract

On 13 September, 2015, the Visual, Infrared and Thermal Imaging Spectrometer (VIRTIS) onboard Rosetta observed strong, anomalous activity of the coma of 67P/Churyumov-Gerasimenko starting at 13:40 UTC, in a range of latitude between -26° and -40° and longitude between 265° and 280°. VIRTIS is an imaging spectrometer in the spectral range 0.25-1 mm (VIRTIS- M) and a high-resolution spectrometer in the range 2-5 mm (VIRTIS- H) on board the Rosetta spacecraft. The instrument observed one large outburst followed by two mini-outbursts that occurred approximately one hour thereafter. This is probably the highest temporally resolved dataset available from a remote sensing instrument of an outburst observed on 67P. The data cover the full spectral range of the two channels and allow studying both dust and gas properties to derive information on the underlying physical mechanism driving the outbursts.The preliminary results of the outburst sequence indicate that they occur on the daylight side of the nucleus. They are characterized by a short duration and decay that lasts typically 15 minutes for the large outburst and 5 minutes for the two mini outbursts. The spatial and temporal distribution of the dust indicates a complex light curve for each event showing internal structures. The large outburst shows a bluer color than the background coma in the range of 2-2.5mm with a value around 1% per 100 nm, which can be interpreted as a change of dust properties and perhaps the presence of icy grains. However, the spectral signature of water ice at 3 mm is not detected in the outburst material, or in the background coma. In the range of 0.45-0.75 mm, the spectral slope shows a redder value in the outburst material (15 % per 100 nm) than in the background (12 % per 100 nm).The dust temperature, measured by fitting the thermal continuum, is much higher for the outburst material than for the background coma. No significant increase in CO2 or H2O production is detected. Both the bluer color in the IR and the higher temperature suggest that the outburst material is dominated by small dust particles. Further analysis will be presented during the congress.

Item URL in elib:https://elib.dlr.de/107192/
Document Type:Conference or Workshop Item (Speech)
Title:The outburst sequence of 67/P on 2015 September 13 as seen by VIRTIS/Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rinaldi, G.Istituto di Fisica dello Spazio Interplanetario (IFSI-INAF), Rome - ItalyUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Steckloff, JordanPlanetary Science InstituteUNSPECIFIED
Tozzi, G.Osservatorio Astrofisico di Arcetri, Firenze, ItalyUNSPECIFIED
Fink, U.Lunar Planetary Laboratory, Univarsity of Arizona, Tucson, USAUNSPECIFIED
Doose, LynUniversity of ArizonaUNSPECIFIED
Piccioni, G.INAF-IASFUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Combi, M.Space Physics Research Laboratory, The University of Michigan, Ann Arbor, USAUNSPECIFIED
Desanctis, M.C.INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.deUNSPECIFIED
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIED
Migliorini, A.INAF-IASFUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIED
Taylor, F.W.University of OxfordUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Date:18 October 2016
Journal or Publication Title:Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC)
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:48
Page Range:206.05-206.05
Status:Published
Keywords:VIRTIS, Rosetta, 67P, Activity
Event Title:Joint 48th meeting of the Division for Planetary Sciences (DPS) and 11th European Planetary Science Congress (EPSC)
Event Location:Pasadena, CA, USA
Event Type:international Conference
Event Dates:16.-21. Oct. 2016
Organizer:American Astronomical Society
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
Institute of Planetary Research > Leitungsbereich PF
Institute of Planetary Research > Asteroids and Comets
Deposited By: Kappel, David
Deposited On:28 Oct 2016 08:55
Last Modified:31 Jul 2019 20:04

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