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

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Posted: Monday, April 4, 2005

image Astrophysics, abstract

From: Ralph Neuhaeuser [view email]
Date: Thu, 31 Mar 2005 11:33:27 GMT   (67kb)
Evidence for a co-moving sub-stellar companion of GQ Lup

Authors: R. Neuhaeuser (AIU Jena), E.W. Guenther (TLS Tautenburg), G. Wuchterl, M. Mugrauer, A. Bedalov (AIU Jena), P.H. Hauschildt (Univ. Hamburg)
Comments: 4 pages with 4 figures A&A Letter in press

We present a companion of the \le 2 Myr young classical T Tauri star GQ Lup in the Lupus star forming region at 140 \pm 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 arc sec 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 7 sigma, respectively, hence it is a co-moving companion. Its K-L' color is consistent with a spectral type early to mid L. Our NACO K-band spectrum yields spectral type M9-L4 with H2O and CO absorption, consistent with the new GAIA-Dusty template spectrum for log g = 2 to 3 and Teff = 2000 K with ~2 Rjup radius at ~140 pc, hence few Jupiter masses. Using the theoretical models from Wuchterl & Tscharnuter (2003), Burrows et al. (1997), and Baraffe et al. (2002), the mass lies between 1 and 42 Jupiter masses.
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