New astrometry and photometry for the companion candidates of CT Cha

Details New astrometry and photometry for the companion candidates of CT Cha New astrometry and photometry for the companion candidates of CT Cha

2009-05-12

arxiv.org/abs/0905.1936v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

4 pages, 2 figures, Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, St Andrews - Scotla

Scientific paper

10.1063/1.3099250

In our ongoing search for close and faint companions around T Tauri stars in the Chamaeleon star-forming region, we recently (Schmidt et al 2008b) presented direct observations and integral field spectroscopy of a new common proper motion companion to the young T-Tauri star and Chamaeleon member CT Cha and discussed its properties in comparison to other young, low-mass objects and to synthetic model spectra from different origins. We now obtained for the first time direct H-Band observations of the companion CT Cha b and of another faint companion candidate (cc2) approximately 1.9 arcsec northeast of CT Cha using the Adaptive Optics (AO) instrument Naos-Conica (NACO) at the Very Large Telescope (VLT) of the European Southern Observatory (ESO) in February 2008. From these data we can now exclude by 4.4 & 4.8 sigma that CT Cha b is a non-moving background object and find cc2 to be most likely a background star of spectral type <= K4 with a proper motion of mu{alpha} cos{delta} = -8.5 +/- 5.7 mas/yr and mu{delta} = 12.0 +/- 5.6 mas/yr, not consistent with being a member of the Cha I star-forming region.

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