Comparison of Early Evolutions of Mimas and Enceladus

• Autorzy: Czechowski L. , Witek P.

Identyfikatory

DOI

10.1515/acgeo-2015-0024

• Języki publikacji: EN

Abstrakty

EN

Thermal history of Mimas and Enceladus is investigated from the beginning of accretion to 400 Myr. The numerical model of convection combined with the parameterized theory is used. The following heat sources are included: short lived and long lived radioactive isotopes, accretion, serpentinization, and phase changes. The heat transfer processes are: conduction, solid state convection, and liquid state convection. We find that temperature of Mimas’ interior was significantly lower than that of Enceladus. If Mimas accreted 1.8 Myr after CAI then the internal melting and differentiation did not occur at all. Comparison of thermal models of Mimas and Enceladus indicates that conditions favorable for the start of tidal heating lasted for a short time (~107 yr) in Mimas and for ~108 yr in Enceladus. This could explain the Mimas-Enceladus paradox. In fact, in view of the chronology based on cometary impact rate, one cannot discard a possibility that also Mimas was for some time active and it has the interior differentiated on porous core and icy mantle.

Słowa kluczowe

EN

medium-sized satellites; thermal evolution; differentiation; Mimas–Enceladus paradox

PL

satelity średnie; ewolucja cieplna; różnicowanie; paradoks Mimas-Enceladus

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2015
• Tom: Vol. 63, no. 3
• Strony: 900--921
• Opis fizyczny: Bibliogr. 47 poz., rys., tab., wykr.

Twórcy

autor

Czechowski L.

• Institute of Geophysics, University of Warsaw, Warszawa, Poland

autor

Witek P.

• Institute of Geophysics, University of Warsaw, Warszawa, Poland

Bibliografia

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