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Stars in the Hubble Ultra Deep Field
N. Pirzkal, K. C. Sahu, A. Burgasser +11
We identified 46 unresolved source candidates in the Hubble Ultra Deep Field, down to i775 = 29.5. Unresolved objects were identified using a parameter S, which measures the deviat…
Spectral Classification Beyond M
S. K. Leggett, F. Allard, A. J. Burgasser +3
Significant populations of field L and T dwarfs are now known, and we anticipate the discovery of even cooler dwarfs by Spitzer and ground-based infrared surveys. However, as the n…
Ultracool Subdwarfs: Metal-poor Stars and Brown Dwarfs Extending into the Late-type M, L and T Dwarf Regimes
Adam J. Burgasser, J. Davy Kirkpatrick, Sebastien Lepine
Recent discoveries from red optical proper motion and wide-field near-infrared surveys have uncovered a new population of ultracool subdwarfs -- metal-poor stars and brown dwarfs e…
Discovery of a Second L Subdwarf in the Two Micron All Sky Survey
Adam J. Burgasser
I report the discovery of the second L subdwarf identified in the Two Micron All Sky Survey, 2MASS J16262034+3925190. This high proper motion object (mu = 1.27+/-0.03 "/yr) exhibit…
T Dwarfs and the Substellar Mass Function. I. Monte Carlo Simulations
Adam J. Burgasser
Monte Carlo simulations of the field substellar mass function (MF) are presented. Starting from various representations of the MF below 0.1 M$_{\sun}$ and the stellar birth rate, l…
Meeting the Cool Neighbors VIII: A preliminary 20-parsec census from the NLTT catalogue
I. N. Reid, K. L. Cruz, P. R. Allen +8
Continuing our census of late-type dwarfs in the Solar Neighbourhood, we present BVRI photometry and optical spectroscopy of 800 mid-type M dwarfs drawn from the NLTT proper motion…