# Parallaxes and Proper Motions of Ultracool Brown Dwarfs of Spectral Types Y and Late T

@article{Marsh2013ParallaxesAP, title={Parallaxes and Proper Motions of Ultracool Brown Dwarfs of Spectral Types Y and Late T}, author={K. A. Marsh and E. Wright and J. Kirkpatrick and C. Gelino and Michael C. Cushing and R. L. Griffith and M. Skrutskie and P. Eisenhardt}, journal={The Astrophysical Journal}, year={2013}, volume={762}, pages={119} }

We present astrometric measurements of 11 nearby ultracool brown dwarfs of spectral types Y and late-T, based on imaging observations from a variety of space-based and ground-based telescopes. These measurements have been used to estimate relative parallaxes and proper motions via maximum likelihood fitting of geometric model curves. To compensate for the modest statistical significance (≲7) of our parallax measurements we have employed a novel Bayesian procedure for distance estimation which… CONTINUE READING

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