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

Kastner, J. H. and Sacco, G. G. and Montez, R., Jr. and Huenemoerder, D. P. and Shi, H. and Alecian, E. and Argiroffi, C. and Audard, M. and Bouvier, J. and Damiani, F. and Donati, J.-F and Gregory, S. G. and Güdel, M. and Hussain, G. A. J. and Maggio, A. and Montmerle, T. (2011) GSC 07396-00759 = V4046 Sgr C[D]: A Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB. Astrophysical Journal Letters, 740 (1). Art. No. L17. ISSN 2041-8205.

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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 (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 (1) their dissolution ~10^6 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.

Item Type:Article
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Kastner, J. H.0000-0002-3138-8250
Bouvier, J.0000-0002-7450-6712
Additional Information:© 2011 American Astronomical Society. Received 2011 July 29; accepted 2011 September 2; published 2011 September 20. This research was supported by the NASA Goddard Space Flight Center XMM-Newton Guest Observer Facility and the NASA Astrophysics Data Analysis Program grants to RIT (NASA grant numbers NNX09AT15G and NNX09AC96G, respectively). D.P.H. was supported by NASA through the Smithsonian Astrophysical Observatory (SAO) contract SV3-73016 for the Chandra X-Ray Center and Science Instruments. M.A. acknowledges support from the SwissNational Science Foundation (grants PP002–110504 and PP00P2–130188). The authors thank B. Zuckerman for useful discussions, the anonymous referee for a thorough and insightful review, and Emily Thompson (West Irondequoit [NY] High School) for contributions to the catalog research reported herein.
Funding AgencyGrant Number
NASA Goddard Space Flight Center XMM-Newton Guest Observer FacilityUNSPECIFIED
NASA Astrophysics Data Analysis ProgramNNX09AT15G
NASA Astrophysics Data Analysis ProgramNNX09AC96G
NASA Smithsonian Astrophysical Observatory (SAO)SV3-73016
Swiss National Science FoundationPP002–110504
Swiss National Science FoundationPP00P2–130188
Subject Keywords:binaries: close; circumstellar matter; protoplanetary disks; stars: pre-main sequence
Issue or Number:1
Classification Code:PACS: 97.21.+a; 97.10.Fy; 97.10.Ri; 98.70.Qy; 97.80.Fk
Record Number:CaltechAUTHORS:20111017-102843827
Persistent URL:
Official Citation:GSC 07396-00759 = V4046 Sgr C[D]: A Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB J. H. Kastner et al. 2011 ApJ 740 L17
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27244
Deposited By: Jason Perez
Deposited On:18 Oct 2011 14:40
Last Modified:09 Mar 2020 13:18

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