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Ultra cool dwarfs with companions

Published online by Cambridge University Press:  21 October 2010

R. G. Kurtev
Affiliation:
Department of Physics and Astronomy, Valparaiso University, Chile email: [email protected]; [email protected]
V. D. Ivanov
Affiliation:
European Southern Observatory, Santiago, Chile, email: [email protected]
R. Jayawardhana
Affiliation:
Toronto University, Canada, email: [email protected]
J. H. Borissova
Affiliation:
Department of Physics and Astronomy, Valparaiso University, Chile email: [email protected]; [email protected]
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The binary fraction in the sub-stellar regime is a topic of discussion. The lower masses of ultra cool dwarfs (UCDs) with respect to the other stars make them even more important because a measurable effect on their radial velocity (RV) or luminosities can be caused by extremely low mass companions. Some UCDs in young star forming regions are bright enough to be studied with existing high resolution instrumentation. The UCDs are intrinsically faint in the optical and the optical RV measurements are affected by “rotationally modulated inhomogeneous surface features” that can mimic a companion, while the near-infrared (NIR) RVs are less prone to them. Therefore, we decided to monitor the RV of six UCDs in the NIR. Blake et al. (2007) demonstrated RV measurement accuracy of 300-600 m s−1 in the NIR using telluric calibration.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

Blake, et al. 2007, ApJ, 666, 1198Google Scholar
Slesnick, et al. 2006, AJ, 131, 3016CrossRefGoogle Scholar