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Transcript
Interior of exoplanetes Doris Breuer, DLR Institute of Planetary Research Basic parameters for the interior structure • Radius and mass à density (constraint on average composition) Any other information (e.g. differentiated in a core and mantle, sizes of the reservoirs) base on assumptions Stevenson, 2004 Page 4 > Objectives and Accomplishments > Prof. Dr.Tilman Spohn Interior structure of Exoplanets ~10% (Wagner et al., Icarus, 2011) ~5% Simulation of Exoplanets: Needed Accuracy • Assume an Earth-size exoplanet (at any age) is found – can we assess how earthlike the interior structure is? • Error in core-mantle fraction influenced by accuracy of radius determination: εcmf = (14.08*εr)0.7745 Mantle Mantle What are the implications for mantle dynamics and the atmosphere? Core Core Interior structure and atmosphere Courtesy of L. Noack • • • • Influence on outgassing: A smaller mantle would be expected to have a smaller amount of volatiles → less-dense atmosphere Influence on mantle temperature: Mantle may cool much faster (smaller amount of radioactive heat sources) → outgassing may stop sooner Influence on plate tectonics: Small mantle develops (if at all) small-scale convection → bad for plate tectonics Influence on magnetic field: less easy to maintain high heat flux at the core-mantle boundary → bad for magnetic fields Propensity for Plate Tectonics Implications for Habitability How it works on Earth: Space Erosion Magnetosphere Shielding Biosphere Hydrosphere Atmosphere Crust Subduction Outgassing Mantle Cooling Core Dynamo Implications for Habitability No magnetic field -> bad for life Space Erosion Magnetosphere Shielding Biosphere Hydrosphere Atmosphere? Crust Subduction Outgassing Mantle Cooling Core Dynamo Implications for Habitability No magnetic field -> bad for life Space Erosion No plate tectonics -> bad for magnetic field -> bad for life Magnetosphere Shielding Biosphere Hydrosphere Atmosphere? Crust Subduction Outgassing Mantle Cooling Core Dynamo Implications for Habitability No magnetic field -> bad for life Space Erosion No plate tectonics -> bad for magnetic field -> bad for life Magnetosphere Shielding Biosphere Hydrosphere Atmosphere? Crust In addition: no outgassing -> bad for life Outgassing Mantle Cooling Core Dynamo?
