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The NIRSPEC Brown Dwarf Spectroscopic Survey II: High-Resolution J-Band Spectra of M, L and T Dwarfs
Ian S. McLean, L. Prato, Mark R. McGovern +4
We present a sequence of high resolution (R~20,000 or 15 km/s) infrared spectra of stars and brown dwarfs spanning spectral types M2.5 to T6. Observations of 16 objects were obtain…
Discovery of a High Proper Motion L Dwarf Binary: 2MASS J15200224-4422419AB
Adam J. Burgasser, Dagny L. Looper, J. Davy Kirkpatrick +1
We report the discovery of the wide L1.5+L4.5 binary 2MASS J15200224-4422419AB, identified during spectroscopic followup of high proper motion sources selected from the Two Micron…
A Sensitive Search for Variability in Late L Dwarfs: The Quest for Weather
M. Morales-Calderon, J. R. Stauffer, J. Davy Kirkpatrick +10
We have conducted a photometric monitoring program of 3 field late-L brown dwarfs looking for evidence of non-axisymmetric structure or temporal variability in their photospheres.…
A Spitzer Infrared Spectrograph (IRS) Spectral Sequence of M, L, and T Dwarfs
M. C. Cushing, T. L. Roellig, M. S. Marley +8
We present a low-resolution (R = 90), 5.5-38 micron spectral sequence of a sample of M, L, and T dwarfs obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Tele…
Discovery of the Coolest Extreme Subdwarf
Adam J. Burgasser, J. Davy Kirkpatrick
We report the discovery of LEHPM 2-59 as the coolest extreme M subdwarf (esdM) found to date. Optical and near infrared spectroscopy demonstrate that this source is of later spectr…