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Investigating the young AU~Mic system with SPIRou: large-scale stellar magnetic field and close-in planet mass
Baptiste Klein, Jean-François Donati, Claire Moutou +12
We present a velocimetric and spectropolarimetric analysis of 27 observations of the 22-Myr M1 star AU Microscopii (Au Mic) collected with the high-resolution (0.98-2.35 …
The large-scale magnetic field of Proxima Centauri near activity maximum
Baptiste Klein, Jean-François Donati, Élodie M. Hébrard +5
We report the detection of a large-scale magnetic field at the surface of the slowly-rotating fully-convective M dwarf Proxima Centauri. Ten circular polarization spectra, collecte…
SPIRou: nIR velocimetry & spectropolarimetry at the CFHT
J. -F. Donati, D. Kouach, C. Moutou +63
This paper presents an overview of SPIRou, the new-generation near-infrared spectropolarimeter / precision velocimeter recently installed on the 3.6-m Canada-France-Hawaii Telescop…
Spin-orbit alignment and magnetic activity in the young planetary system AU Mic
E. Martioli, G. Hebrard, C. Moutou +21
We present high resolution near-infrared spectropolarimetric observations using the SPIRou instrument at CFHT during a transit of the recently detected young planet AU Mic b, with…
Measuring stellar magnetic helicity density
K. Lund, M. Jardine, L. T. Lehmann +10
Helicity is a fundamental property of a magnetic field but to date it has only been possible to observe its evolution in one star - the Sun. In this paper we provide a simple techn…
Impact of a companion and of chromospheric emission on the shape of chromosome maps for globular clusters
Fabrice Martins, Julien Morin, Corinne Charbonnel +2
We investigate the role of binaries and chromospheric emission on HST photometry of globular clusters' stars. We quantify their respective effects on the position of stars in the c…