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

All issues

Volume 64 (2014)

EPJ Web of Conferences, 64 (2014) 08009

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 64, 2014 Physics at the Magnetospheric Boundary


Article Number		08009
Number of page(s)		4
Section		Observations of Young Stellar Objects
DOI		https://doi.org/10.1051/epjconf/20136408009
Published online		08 January 2014

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.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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