Results of the 2MASS Proper Motion Survey: New M, L, and T (Sub)Dwarfs in the Solar Neighborhood

Details Results of the 2MASS Proper Motion Survey: New M, L, and T (Sub)Dwarfs in the Solar Neighborhood Results of the 2MASS Proper Motion Survey: New M, L, and T (Sub)Dwarfs in the Solar Neighborhood

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1707k&link_type=abstract

American Astronomical Society Meeting 210, #17.07; Bulletin of the American Astronomical Society, Vol. 39, p.118

Astronomy and Astrophysics

Astronomy

Scientific paper

Using multi-epoch 2MASS data, we have conducted two large-area near-infrared proper motion surveys. The first uses normal (1x) 2MASS data paired with special long exposure (6x) 2MASS data. This survey, primarily covering the Small and Large Magellanic Clouds, has an areal extent of 580 square degrees. The second uses 1x 2MASS data paired with 1x repeats of the same fields. This survey, scattered at various spots all over the sky, covers a total area of 4700 square degrees. Our combined 5280-square-degree survey uncovered 2700 motion stars, 148 of which lack optical counterparts. We present here the results of spectroscopic follow-up of this sample of infrared-only sources. To date we have obtained classification spectra of 136 of these 148 sources and have found low-metallicity (subdwarf) brown dwarfs as late as the L/T transition, young field brown dwarfs, unusually dusty L dwarfs, one early-T/mid-T double, and one common proper motion L dwarf binary. Spectra of some of the more interesting objects will be presented. Discussion of where these objects fall on color-color diagrams will also be addressed in an effort to facilitate future photometric searches for similar objects.

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