The magnetosphere of the close accreting PMS binary V4046 Sgr

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

doi:10.1051/epjconf/20136408009

Proceedings

Open Access

EPJ Web of Conferences 64, 08009 (2014)
https://doi.org/10.1051/epjconf/20136408009

The magnetosphere of the close accreting PMS binary V4046 Sgr

S. G. Gregory¹^a, V. R. Holzwarth², J.-F. Donati³, G. A. J. Hussain⁴, T. Montmerle⁵, E. Alecian⁶, S. H. P. Alencar⁷, C. Argiroffi⁸, M. Audard⁹, J. Bouvier¹⁰, F. Damiani⁸, M. Güdel¹¹, D. P. Huenemoerder¹², J. H. Kastner¹³, A. Maggio⁸, G. G. Sacco¹⁴ and G. A. Wade¹⁵

¹ School of Physics & Astronomy, University of St Andrews, St Andrews, KY16 9SS U.K.
² Freytagstr. 7, D-79114 Freiburg i.Br., Germany
³ UPS-Toulouse/CNRS-INSU, Inst. de Recherche en Astro. et Planétologie, F-31400 Toulouse, France
⁴ ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
⁵ Institut d’Astrophysique de Paris, 98bis bd Arago, FR-75014 Paris, France
⁶ Obs. de Paris, LESIA, 5, place Jules Janssen, F-92195 Meudon Principal Cedex, France
⁷ Dept. de Fìsica - UFMG, Av. Antônio Carlos, 6627 30270-901 Belo Horizonte MG, Brazil
⁸ INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo Italy
⁹ ISDC Data Center for Astrophysics Univ. of Geneva, CH-1290 Versoix Switzerland
¹⁰ UJF-Grenoble 1/CNRS-INSU, IPAG, UMR 5274, F-38041, Grenoble, France
¹¹ Dept. of Astrophysics, University of Vienna, Türkenschanzstrasse 17, A-1180, Vienna, Austria
¹² MIT, Kavli Inst. for Astrophysics & Space Research, Cambridge, MA 02139, U.S.A.
¹³ CIS, Rochester Inst. of Technology, 54 Lomb Memorial Drive, Rochester, MA 02139, U.S.A.
¹⁴ INAF-Arcetri Astrophysical Observatory, Largo Enrico Fermi 5, I - 50125, Florence, Italy
¹⁵ Dept. of Physics, Royal Military College of Canada, Kingston, K7K 7B4, Canada

^a e-mail: sg64@st-andrews.ac.uk

Published online: 8 January 2014

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.

© Owned by the authors, published by EDP Sciences, 2014

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