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Measuring surface magnetic fields of red supergiant stars
RSG stars are very massive cool evolved stars. Recently, a weak magnetic field was measured at the surface of $\alpha$ Ori and this is so far the only M-type supergiant for which a direct detectionExpand
Convective cells in Betelgeuse: imaging through spectropolarimetry
We assess the ability to image the photosphere of red supergiants and, in particular Betelgeuse, through the modelling of the observed linear polarization in atomic spectral lines. We also aim toExpand
Discovery of a complex linearly polarized spectrum of Betelgeuse dominated by depolarization of the continuum
Betelgeuse is an M supergiant that harbors spots and giant granules at its surface and presents linear polarization of its continuum. We have previously discovered linear polarization signaturesExpand
Evolution of the magnetic field of Betelgeuse from 2009 - 2017
Betelgeuse is an M-type supergiant that presents a circularly polarized (Stokes V) signal in its line profiles, interpreted in terms of a surface magnetic field. The weak circular polarizationExpand
Detection of the linearly polarised spectrum of the red supergiant star alpha Ori
In the solar limb, linear polarisation is due to anisotropy of the radiation field induced by limb darkening. It is maximal when it is seen parallel to the limb and it vanishes when it is integratedExpand
The convective photosphere of the red supergiant CE Tauri - I. VLTI/PIONIER H-band interferometric imaging
Context. Red supergiant stars are one of the latest stages in the evolution of massive stars. Their photospheric convection may play an important role in the launching mechanism of their mass loss;Expand
Atomic line radiative transfer with MCFOST
Aims. We present MCFOST-art, a new non-local thermodynamic equilibrium radiative transfer solver for multilevel atomic systems. The code is embedded in the 3D radiative transfer code MCFOST and isExpand
Spectropolarimetric study of the cool RV Tauri star R Scuti
With the spectropolarimeter Narval at TBL we have initiated in spring 2015 a 2-year campaign dedicated to a sample of cool and evolved stars including pulsating RV Tauri stars. We monitor netExpand
Formation of strong emission lines in stellar accretion disks: The link between observations and models
A vast number of planetary systems are found close to young stellar objets, revolving at distances less than 1 AU. These planetary systems are yet inaccessible to the new generations of instruments.Expand