The surprising magnetic topology of τ Sco: fossil remnant or dynamo output?
- J. Donati, I. Howarth, N. Manset
- Physics
- 7 June 2006
We report the discovery of a medium-strength (~0.5 kG) magnetic field on the young, massive star ? Sco (B0.2V), which becomes the third-hottest magnetic star known. Circularly polarized Zeeman…
Large-scale magnetic topologies of late M dwarfs⋆
We present here the final results of the first spectropolarimetric survey of a small sample of active M dwarfs, aimed at providing observational constraints on dynamo action on both sides of the…
Magnetospheric accretion on the T Tauri star BP Tauri
- J. Donati, M. Jardine, E. Alecian
- Physics
- 14 February 2008
From observations collected with the ESPaDOnS and NARVAL spectropolarimeters, we report the detection of Zeeman signatures on the classical T Tauri star BP Tau. Circular polarisation signatures in…
Weak magnetic fields in Ap/Bp stars - Evidence for a dipole field lower limit and a tentative interp
- M. Aurière, G. Wade, N. Toqué
- Physics
- 8 October 2007
Aims. We investigated a sample of 28 well-known spectroscopically-identified magnetic Ap/Bp stars, with weak, poorly-determined or previously undetected magnetic fields. The aim of this study is to…
Magnetic fields and accretion flows on the classical T Tauri star V2129 Oph
- J. Donati, M. Jardine, F. Paletou
- Physics
- 10 September 2007
From observations collected with the ESPaDOnS spectropolarimeter, we report the discovery of magnetic fields at the surface of the mildly accreting classical T Tauri star V2129 Oph. Zeeman signatures…
Toroidal versus poloidal magnetic fields in Sun-like stars: a rotation threshold
- P. Petit, B. Dintrans, R. Fares
- Physics
- 8 April 2008
From a set of stellar spectropolarimetric observations, we report the detection of surface magnetic fields in a sample of four solar-type stars, namely HD 73350, HD 76151, HD 146233 (18 Sco) and HD…
Large-scale magnetic topologies of early M dwarfs
We present here additional results of a spectropolarimetric survey of a small sample of stars ranging from spectral type M0 to M8 aimed at investigating observationally how dynamo processes operate…
Direct detection of a magnetic field in the innermost regions of an accretion disk
- J. Donati, F. Paletou, J. Bouvier, J. Ferreira
- PhysicsNature
- 24 November 2005
The direct detection of the magnetic field in the core of the protostellar accretion disk FU Orionis is reported, and it is found that the field is very filamentary and slows down the disk plasma much more than models predict, which may explain why FU Ori fails to collimate its wind into a jet.
Detection of a weak surface magnetic field on Sirius A: are all tepid stars magnetic?
- P. Petit, F. Lignières, S. Th'eado
- Physics
- 27 June 2011
Aims. We aim at a highly sensitive search for weak magnetic fields in main sequence stars of intermediate mass, by scanning classes of stars with no previously reported magnetic members. After…
The magnetic field of solar prominences
- F. Paletou
- Physics
- 15 October 2008
In his famous monographs, Einar Tandberg-Hanssen writes that "the single, physically most important parameter to study in prominences may be the magnetic field. Shapes, motions, and in fact the very…
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