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| Paper: |
The Brown Dwarf Kinematics Project III: Preliminary Parallax Results |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1343 |
| Authors: |
Faherty, J. K.; Burgasser, A. J.; Walter, F. M.; van der Bliek, N.; Shara, M. M.; Cruz, K. L. |
| Abstract: |
The distances and kinematics of brown dwarfs provide key statistical constraints on their ages, moving group membership, absolute brightnesses, evolutionary trends, and multiplicity. Yet fundamental measurements of parallax, proper motion and radial velocity have been made for only a relatively small fraction of the known brown dwarf population. To address this deficiency, we initiated the Brown Dwarf Kinematics Project (BDKP) which aims to measure and compile the 6D positions and velocities of all known brown dwarfs within 20 pc of the Sun and select sources of scientific interest. In this proceeding we report on the parallaxes of 84 ultracool dwarfs including 17 late-type M and L dwarfs demonstrating spectral signatures of youth, 3 subdwarfs, and 12 L/T transition objects. Combining our measurements with those from the literature, we re-examine color-magnitude and spectrophotometric relations. Using current evolutionary models, we compare the MK vs J-K color magnitude diagram to model predictions. We find that the low-surface gravity dwarfs are significantly redward and underluminous of predictions and a handful of late-type T dwarfs may require thicker clouds to account for their scatter |
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