Spectrum and proper motion of a brown dwarf companion of the T Tauri star CoD-33 7795
R. Neuhaeuser (MPE Garching), E.W. Guenther (TLS Tautenburg), M.G., Petr (MPIfR Bonn), W. Brandner (IfA Honolulu), N. Huelamo (MPE Garching), J., Alves (ESO Garching)

TL;DR
This study confirms a brown dwarf companion to the T Tauri star CoD-33 7795 through spectral analysis and proper motion measurements, marking the first such detection around a pre-main sequence star.
Contribution
It provides the first spectroscopic and proper motion evidence for a brown dwarf companion to a pre-main sequence star, expanding understanding of star and planet formation.
Findings
Companion has spectral type M8.5 to M9.
Proper motion consistent with primary star.
Estimated mass between 15 and 40 Jupiter masses.
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…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies
