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

Published online by Cambridge University Press:  01 October 2007

Tobias Schmidt
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Universität Jena, Schillergäßchen 2-3, 07745 Jena, Germany email: tobi@astro.uni-jena.de
Ralph Neuhäuser
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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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).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

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