THE STRUCTURE AND EVOLUTION OF MEDIUM SIZED ICY BODIES

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Presentation transcript:

THE STRUCTURE AND EVOLUTION OF MEDIUM SIZED ICY BODIES Uri Malamud Acknowledgment: Dina Prialnik Department of Geophysics, Atmospheric, and Planetary Sciences

Water in the solar system Asteroids Main Belt (disguised comets?) Trojans 500 km Comets Kuiper Belt Objects Centaurs Icy Satellites Long-period (Oort Cloud) Short-period (Kuiper Belt) Main Belt (?) Classical Plutinos Scattered

Can life exist elsewhere? Habitable Zone Sentient life evolving on planets Habitable Zone

Why Modeling? Europa Enceladus Titan

How does a Model work? MODEL Processes Properties Energy Sources Heat Transport Composition Thermodynamics Structure Multiphase Flow Physical Traits MODEL Energy Sources Internal External

Modeling of Structure&Evolution IDEAL CASE REAL CASE (Icy bodies) Prototype object Individual object (affected by internal factors) (affected by environment) Equilibrium No equilibrium (hydrostatic, thermal…) (dependence on initial conditions) Multi – parameter family Few free parameters Known input physics/chemistry Uncertain input physics/chemistry (processes, properties) Testable by observations Untestable (ambiguous) Stars ! Exception: active comets !

Water Migration Models Structure Differentiated structure is postulated. Modeling Heating sources. Thermal Evolution. Water Migration Models

Porosity is real

Heat Sources in Larger Icy objects Insolation Crystallization Tidal Heating Serpentinization Long & short lived Radionuclides

Melting Point Water melting (pressure and solubles). Rock melting (pressure and water saturation).

Physical Description

Output

Significance of Water Migration

Thank You

Self Gravity? EOS for compressed porous material. 79 km – highly porous core depleted of ice 20 km – low porosity ice-enriched layer 125 km – porous layer 50% crystalline ice and 50% dust (rock) 7 km – gradual transition from “a” to “c” ice 19 km – “a” ice and dust pristine composition EOS for compressed porous material.

Pore & Grain Distribution Pore Size Distribution. Dust Transport.

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