The spectra of T dwarfs II. red optical data
We present 6300-10100 A spectra for a sample of 13 T dwarfs observed using LRIS mounted on the Keck 10m Telescope.
dwarfs↗
Engineering topics
Burgasser, A.
Publications and source records attributed to Burgasser, A..
Substellar companions to main-sequence stars: no brown dwarf desert at wide separation
Uses three field L and T dwarfs that were discovered to be wide companions to known stars by the Two Micron All-Sky Survey to derive a preliminary brown dwarf companion frequency.
Binary stars brown dwarfs wide dwarf wide companio↗
Spectroscopic Classification Schemes for T Dwarfs
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spectroscopic classification schemes T Dwarfs↗
Detection of H alpha emission in a methane (T type) brown dwarf
We report the detection of H alpha emission in the T dwarf (methane brown dwarf) 2MASSW J1237392 + 652615 over three days using the Keek Low esolution Imaging Spectrograph. The measured line flux, log (L-H alpha/L-bol) = -4.3, is roughly consistent with early M dwarf activity levels and inconsistent with decreasing activity trends in late M and L dwarfs. Similar emission is not seen in two other T dwarfs.
Late-type stars magnetic activity steller activity↗
67 additional L dwarfs discovered by the Two Micron All Sky Survey
One of the goals of this new search was to locate more examples of the latest L dwarfs. Of the 67 new discoveries, 17 have types of L6 or later. Analysis of these new discoveries shows that 16 (and possibly four more) of the new L dwarfs are lithium brown dwarfs and that the average line strength for those L dwarfs showing lithium increases until type L6.5 V, then declines for later types.
Brown dwarfs infrared astronomy stellar photometry↗
Discovery of Four Field Methane (T-type) Dwarfs with 2MASS
We report the discovery of four field methane (T-type) brown dwarfs using 2MASS survey data. One additional methane dwarf, previously discovered by SDSS, was also identified.
infrared stars fundamental parameters low mass bro↗
Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B
We present the discovery of a widely separated (258.3+/-0.4) T dwarf companion to the G1 570ABC system.
low mass brown dwarfs↗