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We report time-resolved, high-resolution optical spectropolarimetricobservations of the young double-lined spectroscopic binary V1878 Ori. Ourobservations were collected with the ESPaDOnS spectropolarimeter at theCanada-France-Hawaii Telescope through the BinaMIcS large programme. V1878 OriA and B are partially convective intermediate mass weak-line T Tauri stars onan eccentric and asynchronous orbit. We also acquired X-ray observations atperiastron and outside periastron.  Using the least-squares deconvolution technique (LSD) to combine informationfrom many spectral lines, we clearly detected circular polarization signals inboth components throughout the orbit. We refined the orbital solution for thesystem and obtained disentangled spectra for the primary and secondarycomponents. The disentangled spectra were then employed to determineatmospheric parameters of the two components using spectrum synthesis.  Applying our Zeeman Doppler imaging code to composite Stokes $IV$ LSDprofiles, we reconstructed brightness maps and the global magnetic fieldtopologies of the two components. We find that V1878 Ori A and B havestrikingly different global magnetic field topologies and mean field strengths.The global magnetic field of the primary is predominantly poloidal andnon-axisymmetric (with a mean field strength of 180 G). while the secondary hasa mostly toroidal and axisymmetric global field (mean strength of 310 G). Thesefindings confirm that stars with very similar parameters can exhibit radicallydifferent global magnetic field characteristics. The analysis of the X-ray datashows no sign of enhanced activity at periastron, suggesting the lack of strongmagnetospheric interaction at this epoch.

The large-scale magnetic field of the eccentric pre-main-sequence binary system V1878 Ori