Finding orbital motion of sub-stellar companions - the case of TWA 5B
Abstract
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.
- Publication:
-
A Giant Step: from Milli- to Micro-arcsecond Astrometry
- Pub Date:
- July 2008
- DOI:
- 10.1017/S1743921308018851
- Bibcode:
- 2008IAUS..248..126S
- Keywords:
-
- stars: low-mass;
- brown dwarfs;
- stars: pre-main-sequence;
- stars: imaging;
- binaries: close;
- stars: individual (TWA 5A;
- TWA 5B)