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Confirming the Magnetic Field Detection at the Surface of Cyg
Alexis Lavail, Arturo López Ariste, Quentin Pilate +3
We present spectropolarimetric observations of Cygni obtained with Neo-Narval at Télescope Bernard Lyot in 2025. We obtained observations across three epochs (2025 Jul, Aug, an…
First images of Antares photosphere from spectropolarimetry
Quentin Pilate, Eric Josselin, Agnès Lèbre +3
Antares is the closest red supergiant (RSG) to Earth. The discovery of linear polarization in the atomic lines of the star opens the path to produce direct images of the photospher…
Making sense of the spectral line profiles of Betelgeuse and other Red SuperGiants
A. López Ariste, Q. Pilate, A. Lavail +1
Spectropolarimetry of atomic lines in the spectra of Betelgeuse, and other Red SuperGiants (RSG), presents broad line profiles in linear polarization, but narrow profiles in intens…
The variability of Betelgeuse explained by surface convection
Quentin Pilate, Arturo López Ariste, Alexis Lavail +1
Context. Betelgeuse is a red supergiant (RSG) that is known to vary semi-regularly on both short and long timescales. The origin of the short period of Betelgeuse has often been as…