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.
@article{arxiv.1309.0103,
title = {The magnetosphere of the close accreting PMS binary V4046 Sgr},
author = {S. G. Gregory and V. R. Holzwarth and J. -F. Donati and G. A. J. Hussain and T. Montmerle and E. Alecian and S. H. P. Alencar and C. Argiroffi and M. Audard and J. Bouvier and F. Damiani and M. Güdel and D. P. Huenemoerder and J. H. Kastner and A. Maggio and G. G. Sacco and G. A. Wade},
journal= {arXiv preprint arXiv:1309.0103},
year = {2015}
}
Comments
Proceedings of the "Physics at the Magnetospheric Boundary" conference, Geneva, June 2013