Astrophys. J., 740, L17 (2011/October-2)
GSC 07396-00759 = V4046 Sgr C[D]: a wide-separation companion to the close T Tauri binary system V4046 Sgr AB.
KASTNER J.H., SACCO G.G., MONTEZ R., HUENEMOERDER D.P., SHI H., ALECIAN E., ARGIROFFI C., AUDARD M., BOUVIER J., DAMIANI F., DONATI J.-F., GREGORY S.G., GUDEL M., HUSSAIN G.A.J., MAGGIO A. and MONTMERLE T.
Abstract (from CDS):
We explore the possibility that GSC 07396-00759 (spectral type M1e) is a widely separated (∼2'.82, or projected separation ∼12,350 AU) companion to the "old" (age ∼12 Myr) classical T Tauri binary system V4046 Sgr AB, as suggested by the proximity and similar space motions of the two systems. If the two systems are equidistant and coeval, then GSC 07396-00759, like V4046 Sgr AB, must be a spectroscopic binary with nearly equal-mass components, and V4046 Sgr must be at least ∼8 Myr old. Analysis of a serendipitous Chandra X-ray grating spectrum and light curve as well as XMM-Newton light curves and CCD spectra of GSC 07396-00759 obtained during long exposures targeting V4046 Sgr AB reveals a relatively hard (TX∼ 107 K) X-ray spectrum, strong flaring, and relatively low-density plasma. These X-ray characteristics of GCS 07396-00759 are indicative of a high level of coronal activity, consistent with its apparent weak-lined T Tauri star status. Interactions between V4046 Sgr AB and GCS 07396-00759 when the two systems were more closely bound may be responsible for (1) their dissolution ∼106 yr ago, (2) the present tight, circular orbit of V4046 Sgr AB, and (3) the persistence of the gaseous circumbinary disk still orbiting V4046 Sgr AB.
binaries: close - circumstellar matter - protoplanetary disks - stars: pre-main sequence
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