Finding new sub-stellar co-moving companion candidates - the case of CT Cha

Details Finding new sub-stellar co-moving companion candidates - the case of CT Cha Finding new sub-stellar co-moving companion candidates - the case of CT Cha

2009-05-12

arxiv.org/abs/0905.1921v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

5 pages, 2 figures, Proceedings of the IAU Symposium 249: Exoplanets: Detection, Formation and Dynamics, Suzhou - China, 22-26

Scientific paper

10.1017/S1743921308016396

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 (Ks{0} = 14.6 mag) of ~ 2.67" separation corresponding to ~ 440 AU. 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 4 sigma significance).

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