Finding new sub-stellar co-moving companion candidates - the case of CT Cha
Abstract
We have searched for close and faint companions around T Tauri stars in the Chamaeleon star forming region. Two epochs of direct imaging data were taken with the VLT Adaptive Optics instrument NaCo in February 2006 and March 2007 in Ks band for the classical T Tauri star CT Cha together with a Hipparcos binary for astrometric calibration. Moreover a J band image was taken in March 2007 to get color information. We found CT Cha to have a very faint companion (Ks0=14.6 mag) of ∼2.67" separation corresponding to ∼440AU. We show that CT Cha A and the faint object form a common proper motion pair and that the companion is not a non-moving background object (with 4σ significance).
- Publication:
-
Exoplanets: Detection, Formation and Dynamics
- Pub Date:
- May 2008
- DOI:
- 10.1017/S1743921308016396
- arXiv:
- arXiv:0905.1921
- Bibcode:
- 2008IAUS..249...65S
- Keywords:
-
- stars: planetary systems;
- pre-main-sequence;
- imaging;
- individual: CT Cha;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 5 pages, 2 figures, Proceedings of the IAU Symposium 249: Exoplanets: Detection, Formation and Dynamics, Suzhou - China, 22-26 October 2007