Six-yr SPIRou monitoring of the young planet-host dwarf AU Mic
J.-F. Donati, P.I. Cristofari, C. Moutou, A. L'Heureux, N.J. Cook, E. Artigau, S.H.P. Alencar, E. Gaidos, A. Vidotto, P. Petit, A. Carmona, T. Ray, and the SPIRou science team

TL;DR
This six-year study of AU Mic combines spectropolarimetric and velocimetric data to analyze its magnetic field evolution and refine the masses of its transiting planets, revealing complex magnetic behavior and diverse planetary densities.
Contribution
The paper provides a comprehensive long-term magnetic field analysis of AU Mic and improves planetary mass estimates, highlighting potential magnetic cycles longer than six years.
Findings
Large-scale magnetic field was mostly poloidal with a dipole component.
Magnetic field strength varied over time, suggesting a long cycle.
Refined masses and densities of AU Mic's planets, revealing diverse compositions.
Abstract
In this paper we revisit our spectropolarimetric and velocimetric analysis of the young M dwarf AU Mic based on data collected with SPIRou at the Canada-France-Hawaii telescope, over a monitoring period of 2041 d from 2019 to 2024. The longitudinal magnetic field, the small-scale magnetic field, and the differential temperature of AU Mic, derived from the unpolarized and circularly-polarized spectra, were clearly modulated with the stellar rotation period, with a pattern that evolved over time. The magnetic modeling with Zeeman-Doppler imaging provides a consistent description of the global field of AU Mic that agrees not only with the Least-Squares Deconvolved profiles of the circularly-polarized and unpolarized spectral lines, but also with the small-scale field measurements derived from the broadening of spectral lines, for each of the 11 subsets of the full data. We find that the…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Astronomy and Astrophysical Research
