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Discovery of a 0.15" Binary Brown Dwarf 2MASSJ 1426316+155701 With Gemini/Hokupa'a Adaptive Optics
L. M. Close, D. Potter, W. Brandner +4
Use of the highly sensitive Hokupa'a curvature wavefront sensor has allowed for the first time direct adaptive optics (AO) guiding on brown dwarfs and VLM stars (SpT=M7-L2). An ini…
Spectroscopic Analysis of the DAB White Dwarf PG 1115+166: An Unresolved DA + DB Degenerate Binary
P. Bergeron, James Liebert
A spectroscopic analysis of the DAB white dwarf PG 1115+166 is presented. The observed hydrogen and helium line profiles are shown to be incompatible with model spectra calculated…
Theoretical Spectral Models of T Dwarfs at Short Wavelengths and Their Comparison with Data
Adam Burrows, Adam J. Burgasser, J. Davy Kirkpatrick +4
We have generated new, self-consistent spectral and atmosphere models for the effective temperature range 600 K to 1300 K thought to encompass the known T dwarfs. For the first tim…
The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
Adam J. Burgasser, J. Davy Kirkpatrick, Michael E. Brown +9
We present near-infrared spectra for a sample of T dwarfs, including eleven new discoveries made using the Two Micron All Sky Survey. These objects are distinguished from warmer (L…
Three newly-discovered M-dwarf companions of Solar Neighbourhood stars
J. Davy Kirkpatrick, James Liebert, K. L. Cruz +2
We present low-resolution spectroscopy of newly-discovered candidate companions to three stars in the Solar Neighbourhood. All three companions are M dwarfs, with spectral types ra…
Observational Tests and Predictive Stellar Evolution
P. A. Young, E. E. Mamajek, David Arnett +1
We compare eighteen binary systems with precisely determined radii and masses from 23 to 1.1 M_sol, and stellar evolution models produced with our newly revised code TYCHO. ``Overs…