Bowler, Brendan P., Liu, Michael C., Cushing, Michael C.
We present a near-infrared spectroscopic study of HD 114762B, the latest-type metal-poor companion discovered to date and the only ultracool subdwarf with a known metallicity, inferred from the...
Stephens, D. C., Leggett, S. K., Cushing, Michael C., Marley, Mark S., Saumon, D., Geballe, T. R., ...
We present new 5.2-14.5 micron low-resolution spectra of 14 mid-L to mid-T dwarfs, as well as 3.0-4.1 micron spectra for five of these dwarfs. These data are supplemented by existing red and...
2MASS J06164006−6407194: the first outer halo L subdwarf (2009)
Cushing, Michael C., Looper, Dagney, Burgasser, Adam J., Kirkpatrick, J. Davy, Faherty, Jacqueline
We present the serendipitous discovery of an L subdwarf in the Two Micron All Sky Survey (2MASS) J06164006–6407194, in a search of the 2MASS for T dwarfs. Its spectrum exhibits features indicative...
The Physical Properties of Four ~600 K T Dwarfs (2009)
Leggett, S. K., Cushing, Michael C., Saumon, D., Marley, M. S., Roellig, T. L., Warren, S. J., ...
We present Spitzer 7.6-14.5 μm spectra of ULAS J003402.77–005206.7 and ULAS J133553.45+113005.2, two T9 dwarfs with the latest spectral types currently known. We fit synthetic spectra and...
2MASS 22344161+4041387AB: A Wide, Young, Accreting, Low-mass Binary in the LkHa233 Group (2009)
Allers, K. N., Liu, Michael C., Shkolnik, Evgenya, Cushing, Michael C., Dupuy, Trent J., Mathews, Geoffrey S., ...
We report the discovery of a young, 0.16" binary, 2M2234+4041AB, found as the result of a Keck laser guide star adaptive optics imaging survey of young field ultracool dwarfs. Spatially resolved...
2MASS J09393548–2448279: The coldest and least luminous brown dwarf binary known? (2008)
Burgasser, Adam J., Tinney, C. G., Cushing, Michael C., Saumon, Didier, Marley, Mark S., Bennett, Clara S., ...
Determinations of the luminosity and atmospheric properties of the T8 brown dwarf 2MASS J09393548 - 2448279 are presented, based on Spitzer IRAC and IRS observations and ground-based astrometry. We...
Observation and modelling of dusty, low gravity L, and M dwarfs (2008)
Seifahrt, Andreas, Helling, Christiane, Burgasser, Adam J., Allers, Katelyn N., Cruz, Kelle L., Cushing, Michael C., ...
Observational facilities allow now the detection of optical and IR spectra of young M- and L-dwarfs. This enables empirical comparisons with old M- and L- dwarfs, and detailed studies in comparison...
Looper, Dagny L., Kirkpatrick, J. Davy, Cutri, Roc M., Barman, Travis, Burgasser, Adam J., Cushing, Michael C., ...
We present the discovery of two nearby L dwarfs from our 2MASS proper-motion search, which uses multiepoch 2MASS observations covering ~4700 deg^2 of sky. 2MASS J18212815+1414010 and 2MASS...
Ultracool Subdwarfs: The Halo Population Down to the Substellar Limit (2008)
Burgasser, Adam J., Lepine, Sebastien, Lodieu, Nicolas, Scholz, Ralf-Dieter, Delorme, Phillippe, Jao, Wei-Chun, ...
Ultracool subdwarfs are low luminosity, late-type M and L dwarfs that exhibit spectroscopic indications of subsolar metallicity and halo kinematics. Their recent discovery and ongoing investigation...
An Infrared High Proper Motion Survey Using 2MASS and SDSS: Discovery of M, L and T Dwarfs (2008)
Sheppard, Scott S., Cushing, Michael C.
A search of the Two Micron All Sky Survey and Sloan Digital Sky Survey reveals 36 previously unknown high proper motion objects with J
Moderate-resolution Spitzer infrared spectrograph observations of M, L, and T dwarfs (2008)
Mainzer, A. K., Roellig, Thomas L., Saumon, D., Marley, Mark S., Cushing, Michael C., Sloan, G. C., ...
We present 10-19 μm moderate-resolution spectra of 10 M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. The IRS...
HN Peg B: A Test of Models of the L to T Dwarf Transition (2008)
Leggett, S. K., Saumon, D., Albert, Loic, Cushing, Michael C., Liu, Michael C., Luhman, K. L., ...
Luhman and collaborators recently discovered an early-T dwarf companion to the G0 dwarf star HN Peg, using Spitzer Infrared Array Camera (IRAC) images. Companionship was established on the basis of...
Looper, Dagny L., Kirkpatrick, J. Davy, Cutri, Roc M., Barman, Travis, Burgasser, Adam J., Cushing, Michael C., ...
We present the discovery of two nearby L dwarfs from our 2MASS proper motion search, which uses multi-epoch 2MASS observations covering ~4700 square degrees of sky. 2MASS J18212815+1414010 and 2MASS...
HN Peg B: A Test of Models of the L to T Dwarf Transition (2008)
Leggett, S. K., Saumon, D., Albert, Loic, Cushing, Michael. C., Liu, Michael C., Luhman, K. L., ...
Luhman and collaborators recently discovered an early-T dwarf companion to the G0 dwarf star HN Peg, using Spitzer Infrared Array Camera (IRAC) images. Companionship was established on the basis of...
Atmospheric Parameters of Field L and T Dwarfs (2007)
Cushing, Michael C., Marley, Mark S., Saumon, D., Kelly, Brandon C., Vacca, William D., Rayner, John T., ...
We present an analysis of the 0.95-14.5 micron spectral energy distributions of nine field ultracool dwarfs with spectral types ranging from L1 to T4.5. Effective temperatures, gravities, and...
Moderate Resolution Spitzer Infrared Spectrograph (IRS) Observations of M, L, and T Dwarfs (2007)
Mainzer, A. K., Roellig, Thomas L., Saumon, D., Marley, Mark S., Cushing, Michael C., Sloan, G. C., ...
We present 10 - 19 um moderate resolution spectra of ten M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) onboard the Spitzer Space Telescope. The IRS...
The Schizophrenic Spectrum of LSR 1610-0040: a Peculiar M Dwarf/Subdwarf (2005)
Cushing, Michael C., Vacca, William D.
We present a moderate resolution (R=2000), 0.8-4.1 micron spectrum of LSR 1610-0040, a high proper motion star classified as an early-type L subdwarf by Lepine and collaborators based on its...
An Infrared Spectroscopic Sequence of M, L and T Dwarfs (2004)
Cushing, Michael C., Rayner, John T., Vacca, William D.
We present a 0.6-4.1 micron spectroscopic sequence of M, L, and T dwarfs. The spectra have R~2000 from 0.9 to 2.4 microns and R=2500-200 from 2.9 to 4.1 microns. These new data nearly double the...
FeH absorption in the near-infrared spectra of late M and L dwarfs (2003)
Cushing, Michael C., Rayner, John T., Davis, Sumner P., Vacca, William D.
We present medium-resolution z-, J-, and H-band spectra of four late-type dwarfs with spectral types ranging from M8 to L7.5. In an attempt to determine the origin of numerous weak absorption...
A Method of Correcting Near-Infrared Spectra for Telluric Absorption (2002)
Vacca, William D., Cushing, Michael C., Rayner, John T.
We present a method for correcting near-infrared medium-resolution spectra for telluric absorption. The method makes use of a spectrum of an A0V star, observed near in time and close in airmass to...