The T Tauri star V410 Tau in the eyes of SPIRou and TESS
Benjamin Finociety, Jean-Fran\c{c}ois Donati, Baptiste Klein, Bonnie, Zaire, Lisa Lehmann, Claire Moutou, J\'er\^ome Bouvier, Silvia H.P Alencar,, Louise Yu, Konstantin Grankin, \'Etienne Artigau, Ren\'e Doyon, Xavier, Delfosse, Pascal Fouqu\'e, Guillaume H\'ebrard

TL;DR
This study presents the first NIR spectropolarimetric and photometric maps of the young star V410 Tau, revealing its magnetic and brightness features, differential rotation, and refined stellar parameters, using advanced Zeeman-Doppler Imaging techniques.
Contribution
First simultaneous NIR spectropolarimetric and photometric ZDI maps of V410 Tau, providing new insights into its magnetic topology and surface features compared to optical studies.
Findings
Magnetic field mainly poloidal (~410 G) with a dipole component (~390 G).
Brightness distribution less contrasted than optical images, lacking a prominent polar spot.
Refined radial velocity measurements, confirming the absence of close-in massive planets.
Abstract
We report results of a spectropolarimetric and photometric monitoring of the weak-line T Tauri star V410 Tau based on data collected mostly with SPIRou, the near-infrared (NIR) spectropolarimeter recently installed at the Canada-France-Hawaii Telescope, as part of the SPIRou Legacy Survey large programme, and with TESS between October and December 2019. Using Zeeman-Doppler Imaging (ZDI), we obtained the first maps of photospheric brightness and large-scale magnetic field at the surface of this young star derived from NIR spectropolarimetric data. For the first time, ZDI is also simultaneously applied to high-resolution spectropolarimetric data and very-high-precision photometry. V410 Tau hosts both dark and bright surface features and magnetic regions similar to those previously imaged with ZDI from optical data, except for the absence of a prominent dark polar spot. The brightness…
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