2005/03/31 by R. Neuhäuser, R. Neuhaeuser, E. W. Guenther +4 · 15 citations
Physics and Astronomy · #Astro and Planetary Science #Astrometry #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Jupiter (rocket family) #Physics #Proper motion #Stars #Stellar, planetary, and galactic studies #T Tauri star #astro-ph
paper · pdf · doi:10.1051/0004-6361:200500104
published as Astron.Astrophys.435:L13-L16,2005 · 4 pages with 4 figures A&A Letter in press
arxiv created 2005/03/31 · openalex publication_date 2005/04/25 · arxiv updated 2014/10/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a companion of the ≤2 Myr young classical T Tauri star GQ Lup in the Lupus star forming region at 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 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 , respectively, hence it is a co-moving companion. Its 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 to 3 and 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.