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Analytic and numerical models of the 3D multipolar magnetospheres of pre-main sequence stars

Gregory, S. G. and Donati, J.-F (2011) Analytic and numerical models of the 3D multipolar magnetospheres of pre-main sequence stars. Astronomische Nachrichten, 332 (9-10). pp. 1027-1044. ISSN 0004-6337.

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Traditionally models of accretion of gas on to T Tauri stars have assumed a dipole stellar magnetosphere, partly for simplicity, but also due to the lack of information about their true magnetic field topologies. Before and since the first magnetic maps of an accreting T Tauri star were published in 2007 a new generation of magnetospheric accretion models have been developed that incorporate multipole magnetic fields. Three-dimensional models of the large-scale stellar magnetosphere with an observed degree of complexity have been produced via numerical field extrapolation from observationally derived T Tauri magnetic maps. Likewise, analytic and magnetohydrodynamic models with multipolar stellar magnetic fields have been produced. In this conference review article we compare and contrast the numerical field extrapolation and analytic approaches, and argue that the large-scale magnetospheres of some (but not all) accreting T Tauri stars can be well described by tilted dipole plus tilted octupole field components. We further argue that the longitudinal field curve, whether derived from accretion related emission lines, or from photospheric absorption lines, provides poor constrains on the large-scale magnetic field topology and that detailed modeling of the rotationally modulated Stokes V signal is required to recover the true field complexity. We conclude by examining the advantages, disadvantages and limitations of both the field extrapolation and analytic approaches, and also those of magnetohydrodynamic models.

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Additional Information:© 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Received 2011 Sep 20; accepted 2011 Oct 20; Published online 2011 Dec 12. SGG thanks the organizers for the invitation to give an invited review talk at the meeting, and for financial support. We thank Chris Johns-Krull & Wei Chen for discussions regarding the stellar-disk averaged longitudinal magnetic field component, and Fred Adams & Sean Matt for many interesting discussions. SGG is supported by NASA grant HST-GO-11616.07-A. The “Magnetic Protostars and Planets” (MaPP) project is supported by the funding agencies of CFHT and TBL (through the allocation of telescope time) and by CNRS/INSU in particular, as well as by the French “Agence Nationale pour la Recherche” (ANR).
Funding AgencyGrant Number
NASAHST-GO-11616.07- A
Agence Nationale pour la Recherche (ANR) (France)UNSPECIFIED
Subject Keywords:accretion, accretion disks; magnetohydrodynamics (MHD); stars: magnetic fields; T Tauri stars
Issue or Number:9-10
Record Number:CaltechAUTHORS:20120113-100943464
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Official Citation:Gregory, S. and Donati, J.-F. (2011), Analytic and numerical models of the 3D multipolar magnetospheres of pre-main sequence stars. Astronomische Nachrichten, 332: 1027–1044. doi: 10.1002/asna.201111621
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28778
Deposited By: Jason Perez
Deposited On:13 Jan 2012 19:21
Last Modified:03 Oct 2019 03:35

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