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Spectrum and proper motion of a brown dwarf companion of the T Tauri star CoD-33 7795 | | R. Neuhaeuser
; E.W. Guenther
; M.G. Petr
; W. Brandner
; N. Huelamo
; J. Alves
; | | Date: |
20 Jul 2000 | | Subject: | astro-ph | | Affiliation: | MPE Garching), E.W. Guenther (TLS Tautenburg), M.G. Petr (MPIfR Bonn), W. Brandner (IfA Honolulu), N. Huelamo (MPE Garching), J. Alves (ESO Garching | | Abstract: | We present optical and infrared spectra as well as the proper motion of an H=12 mag object 2" off the ~5 mag brighter spectroscopic binary star CoD-33 7795 (=TWA-5), a member of the TW Hya association of T Tauri stars at ~55 pc. It was suggested as companion candidate by Lowrance et al. (1999) and Webb et al. (1999), but neither a spectrum nor the proper motion of the faint object were available before. Our spectra taken with FORS2 and ISAAC at the ESO-VLT reveal that the companion candidate has spectral type M8.5 to M9. It shows strong H-alpha emission and weak Na I absorption, both indicative of a young age. The faint object is clearly detected and resolved in our optical and infrared images, with a FWHM of 0.18" in the FORS2 image. The faint object’s proper motion, based on two year epoch difference, is consistent with the proper motion of CoD-33 7795 by 5 Gaussian sigma significance. From three different theoretical pre-main sequence models, we estimate the companion mass to be between ~15 and 40 M_jup, assuming the distance and age of the primary. A slight offset between the VLT and HST images with an epoch difference of two years can be interpreted as orbital motion. The probability for chance alignment of such a late-type object that close to CoD-33 7795 with the correct proper motion is below 7e-9. Hence, the faint object is physically associated with CoD-33 7795, the 4th brown dwarf companion around a normal star confirmed by both spectrum and proper motion, the first around a pre-main sequence star. | | Source: | arXiv, astro-ph/0007301 | | Services: | Forum | Review | PDF | Favorites | |
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