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Thermal structure and interior dynamics of the first rocky exoplanets

Wagner, F.W. and Sohl, F. and Tosi, N. and Spohn, T. (2011) Thermal structure and interior dynamics of the first rocky exoplanets. In: Book of abstracts, p. 26. European Week of Astronomy and Space Science (JENAM 2011), 2011-07-04 -- 2011-07.08, Saint Petersburg, Russia. ISBN 978-5-9651-0555-7.

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This study is aimed at the interior structure and thermal state of massive rocky exoplanets. We have modeled the interior structure of confirmed super-Earths CoRoT-7b and Kepler-10b, applying a mixing length approach for the radial temperature distribution. 2-D cylindrical mantle convection simulations are performed using the compressible anelastic approximation. These demonstrate the importance of the usage of depth-dependent thermodynamic parameters such as thermal expansivity, conductivity, and density. The calculations indicate that CoRoT-7b and Kepler-10b are similarly composed. Whereas thermal conductivity and density increase with depth by a factor of two, thermal expansivity decreases by more than an order of magnitude across the mantle. The planform of mantle convection is strongly modified in the presence of depth-dependent material properties with hot plumes rising across the whole mantle and cold downwellings assimilated in the mid mantle.

Document Type:Conference or Workshop Item (Speech)
Title:Thermal structure and interior dynamics of the first rocky exoplanets
AuthorsInstitution or Email of Authors
Wagner, F.W.frank.wagner@dlr.de
Sohl, F.frank.sohl@dlr.de
Tosi, N.nicola.tosi@dlr.de
Spohn, T.Tilman.Spohn@dlr.de
Date:July 2011
Journal or Publication Title:Book of abstracts
Refereed publication:No
In ISI Web of Science:No
Page Range:p. 26
Keywords:Extrasolar planets, super-Earth, interior structure, bulk composition, thermal state, mantle convection, exoplanets, CoRoT-7b, Kepler-10b
Event Title:European Week of Astronomy and Space Science (JENAM 2011)
Event Location:Saint Petersburg, Russia
Event Type:international Conference
Event Dates:2011-07-04 -- 2011-07.08
Organizer:The Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo
HGF - Research field:Aeronautics, Space and Transport (old), Aeronautics, Space and Transport (old)
HGF - Program:Space (old), Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums, W EW - Erforschung des Weltraums
DLR - Research area:Space, Space
DLR - Program:W EW - Erforschung des Weltraums, W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Exploration des Sonnensystems (old), W - Projekt COROT Beteiligung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Frank Sohl
Deposited On:26 Aug 2011 11:54
Last Modified:26 Aug 2011 11:54

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