The magnetosphere of the close accreting PMS binary V4046 Sgr

Authors :: 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.
Publication Year :: 2013
Abstract: 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.<br />Comment: Proceedings of the "Physics at the Magnetospheric Boundary" conference, Geneva, June 2013