Results 11 to 20 of about 86,156 (280)
The 2MASS Wide-Field T Dwarf Search. IV Unting out T dwarfs with Methane Imaging [PDF]
The Astronomical Journal, 2005 We present first results from a major program of methane filter photometry for low-mass stars and brown dwarfs. The definition of a new methane filter photometric system is described.
Adam J. Burgasser +8 more
core +2 more sources
Space Velocities of L- and T-type Dwarfs [PDF]
The Astrophysical Journal, 2007 (Abridged) We have obtained radial velocities of a sample of 18 ultracool dwarfs (M6.5-T8) using high-resolution, near-infrared spectra obtained with NIRSPEC and the Keck II telescope.
Chen B. +17 more
core +5 more sources
Dwarf Archives: A Compendium of M, L, and T Dwarf Data [PDF]
AIP Conference Proceedings, 2009 Dwarf Archives is an online archive containing astrometric, photometric, and spectroscopic information for all known L and T dwarfs (over 650 objects), as well as a select sample of over 500 M dwarfs.
Adam J. Burgasser +3 more
core +4 more sources
Discovery of a T dwarf + white dwarf binary system [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 We present the discovery of the first T dwarf + white dwarf binary system LSPM 1459+0857AB, confirmed through common proper motion and spectroscopy. The white dwarf is a high proper motion object from the LSPM catalogue that we confirm spectroscopically to be a relatively cool (Teff=5535+\-45K) and magnetic (B~2MG) hydrogen-rich white dwarf, with an ...
A. C. Day-Jones +13 more
openaire +3 more sources
T Dwarf Photometric Variability [PDF]
Symposium - International Astronomical Union, 2003 We report on a J and H photometric variability survey of 10 T dwarfs. Four brown dwarfs in the sample show significant J band variability at the 99% confidence level or higher. The amplitude of variation ranges from 2 to 17%. Our data show evidence of variability for late as well as early T dwarfs.
Etienne Artigau +2 more
openaire +1 more source
Infrared Parallaxes for Methane T Dwarfs [PDF]
The Astronomical Journal, 2003 submitted to The Astronomical ...
Tinney, C. G. +2 more
openaire +2 more sources
The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries [PDF]
The Astronomical Journal, 2004 27 pages incl. 9 figures and 8 tables, accepted for publication AJ, May 2004; note that findercharts are provided separately as jpg ...
Burgasser, Adam J. +5 more
openaire +2 more sources
RESOLVED SPECTROSCOPY OF A BROWN DWARF BINARY AT THE T DWARF/Y DWARF TRANSITION [PDF]
The Astrophysical Journal, 2011 We report resolved near-infrared imaging and spectroscopic observations of the T8.5 binary WISEP J045853.90+643452.6AB obtained with Keck/NIRC2, Keck/OSIRIS and the Keck Laser Guide Star Adaptive Optics system. These data confirm common proper and radial motion for the two components, and we see the first indications of orbital motion (mostly radial ...
Burgasser, Adam J. +3 more
openaire +3 more sources
Clouds, Brightening and Multiplicity Across the L Dwarf∕T Dwarf Transition [PDF]
AIP Conference Proceedings, 2009 The transition between the two lowest-luminosity spectral classes of brown dwarfs--the L dwarfs and T dwarfs--is traversed by nearly all brown dwarfs as they cool over time. Yet distinct features of this transition, such as the "J-band bump" and an unusually high rate of multiplicity, remain outstanding problems, although evidence points to condensate ...
Adam J. Burgasser, Eric Stempels
openaire +2 more sources
The Classification of T Dwarfs [PDF]
Symposium - International Astronomical Union, 2003 The discovery of many cool brown dwarfs similar to Gliese 229B has led to the definition of a new spectral class, the T dwarfs, whose 1–2.5 μm spectra exhibit signatures of CH4 absorption. Two classification schemes have been proposed for these objects by Burgasser et al. and Geballe et al.
Adam J. Burgasser +6 more
openaire +1 more source