Discovery of a Very Young Field L Dwarf, 2MASS J01415823-4633574

@article{Kirkpatrick2005DiscoveryOA,
  title={Discovery of a Very Young Field L Dwarf, 2MASS J01415823-4633574},
  author={J. Davy Kirkpatrick and Travis S. Barman and Adam J. Burgasser and Mark R. McGovern and Ian S. McLean and C. G. Tinney and Patrick J. Lowrance},
  journal={The Astrophysical Journal},
  year={2005},
  volume={639},
  pages={1120-1128}
}
While following up L dwarf candidates selected photometrically from the Two Micron All Sky Survey, we uncovered an unusual object designated 2MASS J01415823-4633574. Its optical spectrum exhibits very strong bands of vanadium oxide but abnormally weak absorptions by titanium oxide, potassium, and sodium. Morphologically, such spectroscopic characteristics fall intermediate between old field early-L dwarfs [log(g) ≈ 5] and very late M giants [log(g) ≈ 0], leading us to favor low gravity as the… Expand
Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
We present an analysis of 23 L dwarfs whose optical spectra display unusual features. Twenty-one were uncovered during our search for nearby, late-type objects using the Two Micron All Sky Survey,Expand
A Survey for Hα Emission from Late L Dwarfs and T Dwarfs
Recently, studies of brown dwarfs have demonstrated that they possess strong magnetic fields and have the potential to produce radio and optical auroral emissions powered by magnetospheric currents.Expand
Near-infrared low-resolution spectroscopy of Pleiades L-type brown dwarfs
Context. The fundamental properties of brown dwarfs evolve with age. Models describing the evolution of luminosities and effective temperatures, among other physical parameters, can be empiricallyExpand
Discovery of the Young L Dwarf WISE J174102.78–464225.5
We report the discovery of the L dwarf WISE J174102.78–464225.5, which was discovered as part of a search for nearby L dwarfs using the Wide-field Infrared Survey Explorer (WISE). The distinctExpand
DISCOVERY OF A HIGH PROPER MOTION L DWARF BINARY: 2MASS J15200224 4422419AB
We report the discovery of the wide L1.5+L4.5 binary 2MASS J15200224-4422419AB, identified during spectroscopic follow-up of high proper motion sources selected from the Two Micron All Sky Survey.Expand
THE HYPERACTIVE L DWARF 2MASS J13153094–2649513: CONTINUED EMISSION AND A BROWN DWARF COMPANION*
We report new observations of the unusually active, high proper motion L5e dwarf 2MASS J13153094–2649513. Optical spectroscopy with Magellan/MagE reveals persistent nonthermal emission, with narrow HExpand
Discovery of a young L dwarf binary, SDSS224953.47+004404.6AB
We report discovery of a young 0.''32 L dwarf binary, SDSS J2249+0044AB, found as the result of a Keck laser guide star adaptive optics imaging survey of young field brown dwarfs. Weak K I, Na I, andExpand
Population Properties of Brown Dwarf Analogs to Exoplanets
We present a kinematic analysis of 152 low surface gravity M7-L8 dwarfs by adding 8 parallaxes, 38 radial velocities, and 19 proper motions. We find 39 objects to be high-likelihood or bona fideExpand
Clouds, Gravity, and Metallicity in Blue L Dwarfs: The Case of 2MASS J11263991–5003550*
Optical and near-infrared spectroscopy of the newly discovered peculiar L dwarf 2MASS J11263991–5003550 are presented. Folkes et al. classified this source as a high proper motion L9±1 dwarf based onExpand
Near-infrared spectroscopy of young brown dwarfs in upper Scorpius
Spectroscopic follow-up is a pre-requisite for studies of the formation and early evolution of brown dwarfs. Here, we present Infrared Telescope Facility/SpeX near-infrared spectroscopy of 30Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 40 REFERENCES
The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries
We present the discovery of seven new T dwarfs identified in the Two Micron All Sky Survey. Low-resolution (R � 150) 0.8‐2.5 � m spectroscopy obtained with the Infrared Telescope Facility (IRTF) SpeXExpand
2MASS J05185995–2828372: Discovery of an Unresolved L/T Binary
We present the peculiar near-infrared spectrum of the newly discovered brown dwarf 2MASS J05185995-2828372, identified in the Two Micron All Sky Survey. Features characteristic of both L and T dwarfsExpand
67 Additional L Dwarfs Discovered by the Two Micron All Sky Survey
We present JHKs photometry, far red spectra, and spectral classifications for an additional 67 L dwarfs discovered by the Two Micron All Sky Survey. One of the goals of this new search was to locateExpand
Identifying Young Brown Dwarfs Using Gravity-Sensitive Spectral Features
We report the initial results of the Brown Dwarf Spectroscopic Survey Gravity Project to study gravity sensitive features as indicators of youth in brown dwarfs. Low-resolution (R ~ 2000) J-band andExpand
The First Substellar Subdwarf? Discovery of a Metal-poor L Dwarf with Halo Kinematics
We present the discovery of the first L-type subdwarf, 2MASS J05325346+8246465. This object exhibits enhanced collision-induced H2 absorption, resulting in blue near-infrared (NIR) colors (J-Ks =Expand
Gravity Indicators in the Near-Infrared Spectra of Brown Dwarfs
We investigate the sensitivity to temperature and gravity of the strong absorption features in the J- and K-band spectra of substellar objects. We compare the spectra of giants and young M dwarfs (ofExpand
A Nongray Theory of Extrasolar Giant Planets and Brown Dwarfs
We present the results of a new series of nongray calculations of the atmospheres, spectra, colors, and evolution of extrasolar giant planets (EGPs) and brown dwarfs for effective temperatures belowExpand
Brown Dwarf Companions to G-Type Stars. I. Gliese 417B and Gliese 584C
We present astrometric and spectroscopic observations confirming that two nearby G dwarf systems (Gliese 417 = BD+36°2162 and Gliese 584AB = η CrB AB) have a widely separated, L dwarf, substellarExpand
Evolutionary Models for Very Low-Mass Stars and Brown Dwarfs with Dusty Atmospheres
We present evolutionary calculations for very low-mass stars and brown dwarfs based on synthetic spectra and nongray atmosphere models which include dust formation and opacity, i.e., objects withExpand
Infrared Spectroscopy of Substellar Objects in Orion
We present broad band spectra of a sample of 21 low luminosity sources in the Trapezium Cluster, with masses in the range 0.008 - 0.10 M⊙ (assuming an age of 1 Myr). These were selected for lowExpand
...
1
2
3
4
...