Program: GN-2006A-Q-70
Title: | Classifying Discoveries from a Large-area Near-infrared Proper Motion Survey |
PI: | J Davy Kirkpatrick |
Co-I(s): | Dagny L Looper, Roc M Cutri, Adam J Burgasser |
Abstract
Using multi-epoch 2MASS data, we have conducted a very large area ($\sim$6000
square degrees) near-infrared proper motion survey. The goal of this
survey is to search for nearby, optically faint/invisible sources that
would have been missed by previous optical motion surveys. Earlier
near-infrared searches for nearby stars have relied solely on
photometric criteria that are heavily biased toward solar-age,
solar-metallicity stars and brown dwarfs. Such color-based surveys lead
to an incomplete and biased census of the Solar Neighborhood. On the
other hand, dwarfs that are nearby or have halo kinematics are
generally distinguished by high proper motions. Using our new survey we
have amassed a list of 159 proper motion stars ($\mu \ge 0.2$ arcsec/yr,
$J \le 16.5$) that are invisible on optical blue and red sky survey
plates. We wish to obtain classification spectra of a subset of these (27 objects) to provide ample
statistics on the makeup of this sample. Knowledge of heretofore missed
classes of objects can lead to better photometric selections in the
future. The only known halo brown dwarf (2MASS 0532+82) was discovered
serendipitously, our discovery of a few more halo brown dwarfs would
provide much greater insight into this population.
Publications using this program's data
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[data]
[ADS] Discoveries from a Near-infrared Proper Motion Survey Using Multi-epoch Two Micron All-Sky Survey Data