The Late-Type Extension to MoVeRS (LaTE-MoVeRS): Proper Motion Verified Low-mass Stars and Brown Dwarfs from SDSS, 2MASS, and WISE

作者：Theissen Christopher A^*; West Andrew A; Shippee Guillaume; Burgasser Adam J; Schmidt Sarah J

来源：Astronomical Journal, 2017, 153(3): 92.

DOI：10.3847/1538-3881/153/3/92

• brown dwarfs
• circumstellar matter
• proper motions
• stars: kinematics and dynamics
• stars: late-type
• stars: low-mass

We present the Late-Type Extension to the Motion Verified Red Stars (LaTE-MoVeRS) catalog, containing 46,463 photometric late-type (>M5) dwarfs within the Sloan Digital Sky Survey (SDSS) footprint. Proper motions were computed for objects combining astrometry from the SDSS Data Release 12 (DR12), the Two-micron All-Sky Survey (2MASS) Point Source Catalog, and the Wide-field Infrared Survey Explorer (WISE) AllWISE data sets. LaTE-MoVeRS objects were required to have significant proper motion (mu(tot) >= 2 sigma mu(tot)). Using the LaTE-MoVeRS sample and Gaia Data Release 1, we estimate Gaia will be similar to 64% complete for very low-mass objects (>M5) in comparison to the combined SDSS+2MASS+WISE data set (i < 21.3). We computed photometric distances and estimated stellar effective temperatures for the LaTE-MoVeRS catalog. The majority of the dwarfs in the sample have distances < 150 pc and T-eff < 3000 K. Thirteen objects that have not been previously identified as nearby objects were identified within LaTE-MoVeRS with estimated photometric distances within 25 pc. We also identified one new object that has not been previously identified with a large amount of excess mid-infrared flux. (2MASS J11151597+1937266). This object appears to be an L2 gamma at similar to 50 pc showing spectroscopic signs of a flaring event (e.g., strong hydrogen Balmer emission lines). This object does not exhibit kinematics similar to any known kinematic association. The LaTE-MoVeRS catalog is available through SDSS CasJobs and VizieR.

• 出版日期2017-3