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Physical State of the Deep Interior of the CoRoT-7b Exoplanet

Wagner, F.W. and Sohl, F. and Rückriemen, T. and Rauer, H. (2011) Physical State of the Deep Interior of the CoRoT-7b Exoplanet. In: The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution (IAUS 276), 6, pp. 193-197. Cambridge University Press. IAU Symposium 276: The Astrophysics of Planetary Systems - Formation, Structure, and Dynamical Evolution,, 2010-10-11 -- 2010-10-15, Torino, Italy. ISSN ISSN: 1743-9213 EISSN: 1743-9221

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Official URL: http://journals.cambridge.org/action/displayIssue?decade=2010&jid=IAU&volumeId=6&issueId=S276&iid=8432185

Abstract

The present study takes the CoRoT-7b exoplanet as an analogue for massive terrestrial planets to investigate conditions, under which intrinsic magnetic fields could be sustained in liquid cores. We examine the effect of depth-dependent transport parameters (e.g., activation volume of mantle rock) on a planet's thermal structure and the related heat flux across the core mantle boundary. For terrestrial planets more massive than the Earth, our calculations suggest that a substantial part of the lowermost mantle is in a sluggish convective regime, primarily due to pressure effects on viscosity. Hence, we find substantially higher core temperatures than previously reported from parameterized convection models. We also discuss the effect of melting point depression in the presence of impurities (e.g., sulfur) in iron-rich cores and compare corresponding melting relations to the calculated thermal structure. Since impurity effects become less important at the elevated pressure and temperature conditions prevalent in the deep interior of CoRoT-7b, iron-rich cores are likely solid, implying that a self-sustained magnetic field would be absent.

Document Type:Conference or Workshop Item (Speech)
Title:Physical State of the Deep Interior of the CoRoT-7b Exoplanet
Authors:
AuthorsInstitution or Email of Authors
Wagner, F.W.frank.wagner@dlr.de
Sohl, F.frank.sohl@dlr.de
Rückriemen, T.tina.rueckriemen@dlr.de
Rauer, H.heike.rauer@dlr.de
Date:2011
Journal or Publication Title:The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution (IAUS 276)
Volume:6
Page Range:pp. 193-197
Editors:
EditorsEmail
Sozzetti, A.sozzetti@oato.inaf.it
Lattanzi, M.G.lattanzi@oato.inaf.it
Boss, A.P.boss@dtm.ciw.edu
Publisher:Cambridge University Press
Series Name:Proceedings of the International Astronomical Union, Symposium No. 276
ISSN:ISSN: 1743-9213 EISSN: 1743-9221
Status:Published
Keywords:planets and satellites; CoRoT-7b, exoplanets, formation, interiors, equation of state, bulk composition, internal dynamics, melting, magnetic fields
Event Title:IAU Symposium 276: The Astrophysics of Planetary Systems - Formation, Structure, and Dynamical Evolution,
Event Location:Torino, Italy
Event Type:international Conference
Event Dates:2010-10-11 -- 2010-10-15
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 Vergleichende Planetologie (old), W - Vorhaben Extrasolare Planeten (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Frank Sohl
Deposited On:08 Dec 2011 14:27
Last Modified:08 Dec 2011 14:27

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