SPIRou Input Catalog: Activity, Rotation and Magnetic Field of Cool Dwarfs
C. Moutou, E.M. Hebrard, J. Morin, L. Malo, P. Fouque, A., Torres-Rivas, E. Martioli, X. Delfosse, E. Artigau, R. Doyon

TL;DR
This study presents homogeneous measurements of activity and magnetic fields in 442 low-mass M dwarfs, analyzing their implications for exoplanet searches and magnetic topology, with a focus on identifying stars suitable for precise radial-velocity planet detection.
Contribution
It provides new, homogeneous magnetic and activity diagnostics for a large sample of low-mass stars, linking these to radial-velocity jitter and identifying promising targets for planet searches.
Findings
Large-scale magnetic fields and chromospheric emission contribute to RV jitter.
No strong link between large-scale and small-scale magnetic fields.
Slow rotators show predominantly poloidal magnetic fields.
Abstract
Based on optical high-resolution spectra obtained with CFHT/ESPaDOnS, we present new measurements of activity and magnetic field proxies of 442 low-mass K5-M7 dwarfs. The objects were analysed as potential targets to search for planetary-mass companions with the new spectropolarimeter and high-precision velocimeter, SPIRou. We have analysed their high-resolution spectra in an homogeneous way: circular polarisation, chromospheric features, and Zeeman broadening of the FeH infrared line. The complex relationship between these activity indicators is analysed: while no strong connection is found between the large-scale and small-scale magnetic fields, the latter relates with the non-thermal flux originating in the chromosphere. We then examine the relationship between various activity diagnostics and the optical radial-velocity jitter available in the literature, especially for planet…
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