Evidence for a co-moving sub-stellar companion of GQ Lup

  title={Evidence for a co-moving sub-stellar companion of GQ Lup},
  author={Ralph Neuhaeuser and E. W. Guenther and Guenther Wuchterl and Markus Mugrauer and Ana Bedalov and Peter Hauschildt},
  journal={Astronomy and Astrophysics},
We present a companion of the ≤2 Myr young classical T Tauri star GQ Lup in the Lupus star forming region at 140 ± 50 pc from imaging, astrometry, and spectroscopy. With direct K-band imaging using VLT/NACO, we detected an object 6 mag fainter than GQ Lup located 0.7 �� west of it. Compared to images obtained 2 to 5 years earlier with Subaru/CIAO and HST/PC, this object shares the proper motion of GQ Lup by 5 and 7σ, respectively, hence it is a co-moving companion. Its K −Lcolor is consistent… 

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