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Organic features in the spectrum of 67P/ Churyumov-Gerasimenko from the improved calibration of VIRTIS-M-IR

Raponi, A. and Ciarniello, M. and Filacchione, G. and Capaccioni, F. and Desanctis, M.C. and Moroz, Liubov and Vinogradoff, V. and Tosi, F. and Arnold, Gabriele and Quirico, E. and Mennella, V. and Beck, P. and Pilorget, C. and Pommerol, Antoine and Schröder, Stefan and Kappel, David and Istiqomah, Istiqomah and Rousseau, Batiste and Poch, O. (2018) Organic features in the spectrum of 67P/ Churyumov-Gerasimenko from the improved calibration of VIRTIS-M-IR. In: European Planetary Science Congress (EPSC) 2018, 12, p. 865. European Planetary Science Congress 2018, 16 - 21 Sep 2018, Berlin, Germany.

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Official URL: https://www.epsc2018.eu/

Abstract

The VIRTIS spectra of 67P/CG in the region between 2.9 and 3.5 micron display a wide absorption band, which has been associated to the presence of organic compounds. However, several instrumental effects have hindered, so far, the detailed interpretation of the molecules and compounds contributing to this band. In this work we revised the in-flight calibration of the VIRTIS-M-IR instrument onboard Rosetta spacecraft with the aim to improve: a) the detection of low-contrast spectral features and b) the radiometric accuracy. This updated calibration involves all 432 spectral channels and 256 spatial samples. It includes: 1) the removal of artifacts associated to calibration residuals and/or incomplete flat field correction; 2) the reduction of the non-poissonian noise introduced by the readout electronics of the instrument; 3) a newer version of the radiometric calibration using stellar sources. Furthermore, we have modeled the thermal emission to remove the nucleus contribution at wavelengths in excess of 3.0 micron and we have also modeled and removed, by means of the Hapke model, the contribution of water ice absorption to isolate the organic features within the spectral region 2.9 - 3.5 micron. These spectral features have been compared with laboratory measurements and observations of diffuse interstellar medium to provide indications on the relative contribution of the Aromatic and Aliphatic components.

Item URL in elib:https://elib.dlr.de/124824/
Document Type:Conference or Workshop Item (Speech)
Title:Organic features in the spectrum of 67P/ Churyumov-Gerasimenko from the improved calibration of VIRTIS-M-IR
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Raponi, A.INAF-IASF, ItalyUNSPECIFIED
Ciarniello, M.INAF-IASF, ItalyUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Desanctis, M.C.INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Moroz, LiubovLjuba.Moroz (at) dlr.deUNSPECIFIED
Vinogradoff, V.INAF-IASF, ItalyUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Quirico, E.Grenoble Planetology LaboratoryUNSPECIFIED
Mennella, V.INAF-OAC, Napoli, ItalyUNSPECIFIED
Beck, P.Laboratoire de Planétologie de Grenoble (LPG) - University Joseph Fourier Grenoble, Grenboble, FranceUNSPECIFIED
Pilorget, C.Institut d'Astrophysique Spatiale (IAS), CNRS/Université Paris Sud, Orsay, FranceUNSPECIFIED
Pommerol, AntoinePhysikalisches Institut, Sidlerstrasse 5, University of Bern, 3012, Bern, SwitzerlandUNSPECIFIED
Schröder, StefanStefanus.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
Kappel, DavidDavid.Kappel (at) dlr.dehttps://orcid.org/0000-0002-0518-5548
Istiqomah, IstiqomahLaboratoire de Planétologie de Grenoble (LPG) - University Joseph Fourier Grenoble, Grenboble, FranceUNSPECIFIED
Rousseau, BatisteLESIAUNSPECIFIED
Poch, O.Laboratoire de Planétologie de Grenoble (LPG) - University Joseph Fourier Grenoble, Grenboble, FranceUNSPECIFIED
Date:21 September 2018
Journal or Publication Title:European Planetary Science Congress (EPSC) 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:12
Page Range:p. 865
Series Name:EPSC Abstracts
Status:Published
Keywords:Comet 67P, Rosetta, VIRTIS, Calibration, Composition
Event Title:European Planetary Science Congress 2018
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:16 - 21 Sep 2018
Organizer:Europlanet
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 > Asteroids and Comets
Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:12 Dec 2018 11:33
Last Modified:31 Jul 2019 20:22

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