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Gravito-inertial modes in a differentially rotating spherical shell

García, R.A., Mirouh, Giovanni M., Baruteau, Clément, Rieutord, Michel and Ballot, Jérôme (2015) Gravito-inertial modes in a differentially rotating spherical shell In: The Space Photometry Revolution – CoRoT Symposium 3, Kepler KASC-7 Joint Meeting, 06-11 Jul 2014, Toulouse, France.

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While many intermediate- and high-mass main sequence stars are rapidly and differentially rotating, the effects of rotation on oscillation modes are poorly known. In this communication we present a first study of axisymmetric gravito-inertial modes in the radiative zone of a differentially rotating star. We consider a simplified model where the radiative zone of the star is a linearly stratified rotating fluid within a spherical shell, with differential rotation due to baroclinic effects. We solve the eigenvalue problem with high-resolution spectral computations and determine the propagation domain of the waves through the theory of characteristics. We explore the propagation properties of two kinds of modes: those that can propagate in the entire shell and those that are restricted to a sub-domain. Some of the modes that we find concentrate kinetic energy around short-period shear layers known as attractors. We describe various geometries for the propagation domains, conditioning the surface visibility of the corresponding modes.

Item Type: Conference or Workshop Item (Conference Poster)
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
García, R.A.
Mirouh, Giovanni
Baruteau, Clément
Rieutord, Michel
Ballot, Jérôme
Date : 23 September 2015
DOI : 10.1051/epjconf/201510106046
Copyright Disclaimer : © Owned by the authors, published by EDP Sciences, 2015.
Depositing User : Clive Harris
Date Deposited : 08 Oct 2019 10:38
Last Modified : 08 Oct 2019 10:38

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