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Finding orbital motion of sub-stellar companions - the case of TWA 5B

Published online by Cambridge University Press:  01 October 2007

T. Schmidt ,
R. Neuhäuser  and
M. Mugrauer
T. Schmidt
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Universität Jena, Schillergäßchen 2-3, 07745 Jena, Germany email: tobi@astro.uni-jena.de
R. Neuhäuser
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Universität Jena, Schillergäßchen 2-3, 07745 Jena, Germany email: tobi@astro.uni-jena.de
M. Mugrauer
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Universität Jena, Schillergäßchen 2-3, 07745 Jena, Germany email: tobi@astro.uni-jena.de
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Abstract

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TWA 5B is a brown dwarf companion of H=12 mag, 2″ off the ~5 mag brighter triple star CoD-33° 7795 (=TWA 5), a member of the TW Hydrae association of T Tauri stars at ~55 pc. This object is the first brown dwarf around a pre-main-sequence star (confirmed by common proper motion) ever found. In the last year we have newly reduced VLT NaCo data originally taken in 2003 and combined it with all the available astrometric data of the system to investigate possibly detectable orbital motion of the system. Indeed we were able to find linear orbital motion of the system combining data from HST, VLT and Gemini-North.

Keywords

stars: low-massbrown dwarfsstars: pre-main-sequencestars: imagingbinaries: closestars: individual (TWA 5A, TWA 5B)

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