GSC 07396-00759 = V4046 Sgr C[D]: a Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB

Abstract

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 gratings 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 (T_X ~ 10^7 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 (a) their dissolution ~10^6 yr ago, (b) the present tight, circular orbit of V4046 Sgr AB, and (c) the persistence of the gaseous circumbinary disk still orbiting V4046 Sgr AB.

14 pages, 3 figures; to appear in the Astrophysical Journal (Letters)

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• X-ray accretion signatures in the close CTTS binary V4046 Sgr
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• SSPMJ1102-3431 brown dwarf characterization from accurate proper motion and trigonometric parallax
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• Search for associations containing young stars (SACY) VII. New stellar and substellar candidate members in the young associations
• Reaching the boundary between stellar kinematic groups and very wide binaries. III. Sixteen new stars and eight new wide systems in the beta Pictoris moving group
• The close T Tauri binary system V4046 Sgr: Rotationally modulated X-ray emission from accretion shocks
• The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs
• The beta Pictoris association: Catalog of photometric rotational periods of low-mass members and candidate members
• Binaries among low-mass stars in nearby young moving groups
• New disk discovered with VLT/SPHERE around the M star GSC 07396-00759
• Characterizing the morphology of the debris disk around the low-mass star GSC~07396-00759
• Warm Dusty Debris Disks and Distant Companion Stars: V488 Per and 2M1337
• 2M1155-79 (= T Cha B): A Low-mass, Wide-separation Companion to the Nearby, "Old" T Tauri Star T Cha
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• Constraints on a Putative Planet Sculpting the V4046 Sagittarii Circumbinary Disk
• ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin
• The curious case of PDS 11: a nearby, >10 Myr old, classical T Tauri binary system
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