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The changing temperature of the nucleus of comet 67P induced by morphological and seasonal effects

Tosi, F. and Capaccioni, F. and Capria, M.T. and Mottola, S. and Zinzi, A. and Ciarniello, M. and Filacchione, G. and Hofstadter, M. and Fonti, S. and Formisano, M. and Kappel, D. and Kührt, E. and Leyrat, C. and Vincent, J.-B. and Arnold, G. and De Sanctis, M.C. and Longobardo, A. and Palomba, E. and Raponi, A. and Rousseau, B. and Schmitt, B. and Barucci, M. A. and Bellucci, G. and Benkhoff, J. and Bockelee-Morvan, D. and Cerroni, P. and Combe, J.-Ph. and Despan, D. and Erard, S. and Mancarella, F. and McCord, T. B. and Migliorini, A. and Orofino, V. and Piccioni, G. (2019) The changing temperature of the nucleus of comet 67P induced by morphological and seasonal effects. Nature Astronomy, 3 (7), pp. 649-658. Nature Publishing Group. DOI: 10.1038/s41550-019-0740-0 ISSN 2397-3366

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Official URL: https://www.nature.com/articles/s41550-019-0740-0

Abstract

Knowledge of the surface temperature distribution on a comet’s nucleus and its temporal evolution at different timescales is key to constraining its thermophysical properties and understanding the physical processes that take place at and below the surface. Here we report on time-resolved maps of comet 67P/Churyumov-Gerasimenko retrieved on the basis of infrareddata acquired by the Visible InfraRed and Thermal Imaging Spectrometer (VIRTIS) onboard the Rosetta orbiter in 2014, over a roughly two-month period in the pre-perihelion phase at heliocentric distances between 3.62 and 3.31 au from the Sun. We find that at a spatial resolution ≤15 m per pixel, the measured temperatures point out the major effect that self-heating, due to the complex shape of the nucleus, has on the diurnal temperature variation. The bilobate nucleus of comet 67P also induces daytime shadowing effects, which result in large thermal gradients. Over longer periods, VIRTIS-derived temperature values reveal seasonal changes driven by decreasing heliocentric distance combined with an increasing abundance of ice within the uppermost centimetre-thick layer, which implies the possibility of having a largely pristine nucleus interior already in the shallow subsurface.

Item URL in elib:https://elib.dlr.de/131639/
Document Type:Article
Title:The changing temperature of the nucleus of comet 67P induced by morphological and seasonal effects
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Capaccioni, F.Instituto di Astrofisica Spatiale, CNR, Rome, ItalyUNSPECIFIED
Capria, M.T.Istituto di Astrofisica Spaziale CNR, Viale dell’Università 11, 00185 Rome, ItalyUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.dehttps://orcid.org/0000-0002-0457-3872
Zinzi, A.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIED
Ciarniello, M.INAF–IAPS, Istituto di Astrofisica e Planetologia Spaziali, Area di Ricerca di Tor Vergata, via del Fosso del Cavaliere, 100, 00133 Rome, ItalyUNSPECIFIED
Filacchione, G.Istituto Fisica Spazio Interplanetario, CNR, Via Fosso del Cavaliere, Roma, ItalyUNSPECIFIED
Hofstadter, M.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Fonti, S.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, Rome, ItalyUNSPECIFIED
Formisano, M.Istituto di Astrofisica e Planetologia Spaziali – INAF, via del fosso del cavaliere 100, 00133 Rome, ItalyUNSPECIFIED
Kappel, D.david.kappel (at) dlr.deUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Leyrat, C.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Vincent, J.-B.jean-baptiste.vincent (at) dlr.deUNSPECIFIED
Arnold, G.gabriele.arnold (at) dlr.deUNSPECIFIED
De Sanctis, M.C.INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Longobardo, A.INAF-IAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIED
Palomba, E.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, Rome, ItalyUNSPECIFIED
Raponi, A.INAF-IAPS Istituto di Astrofisica e Planetologia Spaziali, Rome, ItalyUNSPECIFIED
Rousseau, B.LESIA, Observatoire de Paris/CNRS/Universit´e Pierre et Marie Curie/Universit´e Paris-Diderot, Meudon, 75013 Paris, FranceUNSPECIFIED
Schmitt, B.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIED
Barucci, M. A.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
Bellucci, G.Istituto Fisica Spazio Interplanetario, CNR, Roma, ItalyUNSPECIFIED
Benkhoff, J.ESA Research and Scientific Support Department, ESTEC, Noordwijk, NetherlandsUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, 92195 Meudon, FranceUNSPECIFIED
Cerroni, P.Instituto di Astrofisica Spatiale, CNR, Rome, ItalyUNSPECIFIED
Combe, J.-Ph.Bear Fight Institute, 22, Fiddler’s Road, P.O. Box 667, Winthrop, WA 98862, USAUNSPECIFIED
Despan, D.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIED
Erard, S.Institut d’Astrophysique Spatial CNRS, Orsay, FranceUNSPECIFIED
Mancarella, F.Dipartimento di Matematica e Fisica "E. De Giorgi", Università del Salento, Lecce, ItalyUNSPECIFIED
McCord, T. B.Bear Fight Institute, Wintrop, WA 98862, USAUNSPECIFIED
Migliorini, A.INAF-IAPS, Istituto di Astrofisica e Planetologia SpazialiUNSPECIFIED
Orofino, V.Dipartimento di Fisica, universita del Salento, Lecce, ItalyUNSPECIFIED
Piccioni, G.INAF-IASF, Via del Fosso del Cavaliere, 100 00133 Rome, ItalyUNSPECIFIED
Date:2019
Journal or Publication Title:Nature Astronomy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:3
DOI :10.1038/s41550-019-0740-0
Page Range:pp. 649-658
Publisher:Nature Publishing Group
ISSN:2397-3366
Status:Published
Keywords:Comet 67P/Churyumov-Gerasimenko thermal modeling temperature
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 > Leitungsbereich PF
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:03 Dec 2019 14:07
Last Modified:03 Dec 2019 14:07

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