EPJ Web of Conferences (Jan 2014)

The magnetosphere of the close accreting PMS binary V4046 Sgr

  • Gregory S. G.,
  • Holzwarth V. R.,
  • Donati J.-F.,
  • Hussain G. A. J.,
  • Montmerle T.,
  • Alecian E.,
  • Alencar S. H. P.,
  • Argiroffi C.,
  • Audard M.,
  • Bouvier J.,
  • Damiani F.,
  • Güdel M.,
  • Huenemoerder D. P.,
  • Kastner J. H.,
  • Maggio A.,
  • Sacco G. G.,
  • Wade G. A.

DOI
https://doi.org/10.1051/epjconf/20136408009
Journal volume & issue
Vol. 64
p. 08009

Abstract

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V4046 Sagittarii AB is a close short-period classical T Tauri binary. It is a circularised and synchronised system accreting from a circumbinary disk. In 2009 it was observed as part of a coordinated program involving near-simultaneous spectropolarimetric observations with ESPaDOnS at the Canada-France-Hawai’i Telescope and high-resolution X-ray observations with XMM-Newton. Magnetic maps of each star were derived from Zeeman-Doppler imaging. After briefly highlighting the most significant observational findings, we present a preliminary 3D model of the binary magnetosphere constructed from the magnetic maps using a newly developed binary magnetic field extrapolation code. The large-scale fields (the dipole components) of both stars are highly tilted with respect to their rotation axes, and their magnetic fields are linked.