SPIRou observations of the young planet-hosting star PDS 70
J.-F. Donati, P.I. Cristofari, S.H.P. Alencar, \'A. K\'osp\'al, J., Bouvier, C. Moutou, A. Carmona, J. Gregorio-Hetem, C.F. Manara, E. Artigau,, R. Doyon, M. Takami, H. Shang, J. Dias do Nascimento, F. M\'enard, E. Gaidos, and the SPIRou science team

TL;DR
This study uses SPIRou to analyze the magnetic fields, rotation, and accretion processes of the young star PDS 70, revealing a complex magnetic topology, stellar activity, and insights into star-disc interactions over several years.
Contribution
First detailed magnetic and rotational characterization of PDS 70 using near-infrared spectropolarimetry, showing magnetic field evolution and star-disc interaction evidence.
Findings
Detection of Zeeman signatures indicating magnetic fields
Confirmation of the star's rotation period of approximately 3 days
Evidence of magnetic activity affecting accretion and dust penetration
Abstract
This paper presents near-infrared spectropolarimetric and velocimetric observations of the young planet-hosting T Tauri star PDS 70, collected with SPIRou at the 3.6m Canada-France-Hawaii Telescope from 2020 to 2024. Clear Zeeman signatures from magnetic fields at the surface of PDS 70 are detected in our data set of 40 circularly polarized spectra. Longitudinal fields inferred from Zeeman signatures, ranging from -116 to 176 G, are modulated on a timescale of 3.0080.006 d, confirming that this is the rotation period of PDS 70. Applying Zeeman-Doppler imaging to subsets of unpolarized and circularly polarised line profiles, we show that PDS 70 hosts low-contrast brightness spots and a large-scale magnetic field in its photosphere, featuring in particular a dipole component of strength 200-420 G that evolves on a timescale of months. From the broadening of spectral lines, we also…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Stellar, planetary, and galactic studies · Astronomical Observations and Instrumentation
