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New Thermal Model of the Sub-Surface Layer of Comets

Gortsas, Nikolaos und Kührt, Ekkehard und Motschmann, Uwe und Keller, Horst Uwe (2007) New Thermal Model of the Sub-Surface Layer of Comets. In: Bulletin of the American Astronomical Society, DPS meeting 39, 43.07, 39 (3), Seiten 498-499. American Astronomical Society. American Astronomical Society, DPS meeting 39, 2007-10-7 - 2007-10-12, Orlando, Florida (USA). ISSN 0002-7537

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Thermal modeling is an essential tool for investigations of cometary activity and other typical cometary phenomena. Various thermal models have been published to date but their usefulness is compromised by lack of knowledge of the thermal properties of cometary matter. However, recent ground-based measurements of Hale-Bopp (Kührt, 2002) and space-based observations of 9P/Tempel 1 with the Deep Impact spacecraft (Groussin et al., 2007) provide crucial constraints on the physical properties of the nuclei. It is now clear that the heat conductivity of cometary matter is extremely low. Analytical results based on a simplified model lead to the hypothesis that under these circumstances, near perihelion, a thermal wave penetrates the surface material with an average speed lower than that of surface erosion. This effect, together with the low thermal skin depth, implies that subsurface layers are considerably less heated than indicated by previous models. Consequently, water ice sublimation should be confined to the surface and immediate sub-surface layers. In order to quantify this hypothesis we have developed and tested a novel thermal conduction code which allows the strongly nonlinear heat conduction equation and the erosion to be treated consistently by means of a moving surface boundary condition, the so called Stefan problem. A crucial aspect of our method is the numerical treatment of energy conservation. First results of our numerical computations are presented. O. Groussin et al., Surface temperature of the nucleus of Comet 9P/Tempel 1, Icarus 187, 16-25, 2007 E. Kührt, From Hale-Bopp's Activity to Properties of its Nucleus, Earth, Moon and Planets 90, 1-4 / June, 2002

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:New Thermal Model of the Sub-Surface Layer of Comets
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Motschmann, UweDLR und TU BraunschweigNICHT SPEZIFIZIERT
Keller, Horst UweMax-Planck-Institut für SonnensystemforschungNICHT SPEZIFIZIERT
Datum:Oktober 2007
Erschienen in:Bulletin of the American Astronomical Society, DPS meeting 39, 43.07
Referierte Publikation:Nein
In Open Access:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 498-499
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
American Astronomical Society, NICHT SPEZIFIZIERT
Verlag:American Astronomical Society
Name der Reihe:Bulletin of the American Astronomical Society
Stichwörter:Comets, Activity, Thermal modeling, Simulation, Surface erosion, Hale-Bopp
Veranstaltungstitel:American Astronomical Society, DPS meeting 39
Veranstaltungsort:Orlando, Florida (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-10-7 - 2007-10-12
Veranstalter :American Astronomical Society
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Asteroiden und Kometen (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Gortsas, Nikolaos
Hinterlegt am:16 Mär 2009
Letzte Änderung:27 Aug 2009 09:26

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