L and T dwarfs in Gaia/SIM

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Low-Mass, Brown Dwarfs, Stars: Distances

Scientific paper

We discuss the role of distances for understanding brown dwarfs and estimate the contribution expected by Gaia. We show that Gaia will only observe 25% of L and T dwarfs within 50pc which, at a conservative estimate, amounts to less than 400 objects. We discuss how Gaia results will nevertheless aid the ground-based programs providing reliable, bias free constraints for the calculation of parallaxes in an absolute system. We list the current ground-based programs underway and the possibilities for future all sky survey programs.

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