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We have identified two late M dwarfs within 10 parsecs of the Sun, by cross-correlating the Luyten NLTT catalogue of stars with proper motions larger than 0.18 arcsec/yr, with objects lacking optical identification in the 2MASS data base.…

Astrophysics · Physics 2009-11-07 Mark J. McCaughrean , Ralf-Dieter Scholz , Nicolas Lodieu

This paper describes the discovery of seven dwarf objects of spectral type `L' (objects cooler than the latest M dwarfs) in commissioning imaging data taken by the Sloan Digital Sky Survey (SDSS). Low-resolution spectroscopy shows that…

Astrophysics · Physics 2009-10-31 SDSS Collaboration , Xiaohui Fan

We present a new sample of mid L to mid T dwarfs with effective temperatures of 1100 to 1700K selected from the UKIDSS Large Area Survey and confirmed with infrared spectra from X-Shooter/VLT. This effective temperature range is especially…

We present spectra of 36 nearby star candidates and 3 red giant candidates, identified in the DENIS database by Phan-Bao et al. (2003). 32 of the dwarf candidates are indeed nearby red dwarfs, with spectral types from M5.5 to M8.5. Out of…

Astrophysics · Physics 2009-11-11 F. Crifo , N. Phan-Bao , X. Delfosse , T. Forveille , J. Guibert , E. L. Martin , C. Reyle

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. A recipe is provided for the differential calibration of…

Astrophysics · Physics 2016-08-30 C. G. Tinney , Adam J. Burgasser , J. Davy Kirkpatrick , Michael W. McElwain

We present the discovery of five late-type T dwarfs identified with the Wide-field Infrared Survey Explorer (WISE). Low-resolution near-infrared spectroscopy obtained with the Magellan Folded-port InfraRed Echellette (FIRE) reveal strong…

We report the discovery of twenty-one hitherto unknown bright southern ultracool dwarfs with spectral types in the range M7 to L5.5, together with new observations of a further three late M dwarfs previously confirmed. Three more objects…

We present a new catalog of 404 M giant candidates found in the UKIRT Infrared Deep Sky Survey (UKIDSS). The 2,400 deg$^2$ available in the UKIDSS Large Area Survey Data Release 8 resolve M giants through a volume four times larger than…

Astrophysics of Galaxies · Physics 2015-06-17 John J. Bochanski , Beth Willman , Andrew A. West , Jay Strader , Laura Chomiuk

We present 916 trigonometric parallaxes and proper motions of newly discovered nearby stars from the United States Naval Observatory (USNO) Robotic Astrometric Telescope (URAT). Observations were taken at the Cerro Tololo Interamerican…

Solar and Stellar Astrophysics · Physics 2018-02-26 Charlie Finch , Norbert Zacharias , Wei-Chun Jao

We present the photometric properties of 2210 newly identified dwarf galaxy candidates in the MATLAS fields. The Mass Assembly of early Type gaLAxies with their fine Structures (MATLAS) deep imaging survey mapped $\sim$142 deg$^2$ of the…

We present initial results from a wide-field (30,000 deg^2) search for L/T transition brown dwarfs within 25 pc using the Pan-STARRS1 and WISE surveys. Previous large-area searches have been incomplete for L/T transition dwarfs, because…

We announce the discovery of the Aquarius~2 dwarf galaxy, a new distant satellite of the Milky Way, detected on the fringes of the VST ATLAS and the SDSS surveys. The object was originally identified as an overdensity of Red Giant Branch…

Astrophysics of Galaxies · Physics 2016-08-24 G. Torrealba , S. E. Koposov , V. Belokurov , M. Irwin , M. Collins , M. Spencer , R. Ibata , M. Mateo , A. Bonaca , P. Jethwa

We confirm the substellar nature of ULAS J141623.94+134836.3, a common proper motion companion to the blue L dwarf SDSS J141624.08+134826.7 identified by Burningham et al. and Scholz. Low-resolution 0.8-2.4 micron spectroscopy obtained with…

Solar and Stellar Astrophysics · Physics 2015-05-18 Adam J. Burgasser , Dagny L. Looper , John T. Rayner

We report the discovery of seven hitherto unknown L-dwarfs found as a result of a spectroscopic search for distant AGB stars. Their far-red and near-infrared colours are very similar to known dwarfs of the same spectral type. One new object…

Astrophysics · Physics 2008-11-26 T. R. Kendall , N. Mauron , M. Azzopardi , K. Gigoyan

We present a data-driven approach to automatically detect L dwarfs from Sloan Digital Sky Survey(SDSS) images using an improved Faster R-CNN framework based on deep learning. The established L dwarf automatic detection (LDAD) model…

Instrumentation and Methods for Astrophysics · Physics 2023-04-12 Zhi Cao , Zhenping Yi , Jingchang Pan , Hao Su , Yude Bu , Xiao Kong , Ali Luo

We have used data from the UKIRT Hemisphere Survey (UHS) to search for substellar members of the Hyades cluster. Our search recovered several known substellar Hyades members, and two known brown dwarfs that we suggest may be members based…

We present parallaxes, proper motions, and $J$-band photometry for 348 L and T dwarfs measured using the wide-field near-infrared camera WFCAM on the United Kingdom Infrared Telescope. This is the largest single batch of infrared parallaxes…

Solar and Stellar Astrophysics · Physics 2020-11-02 William M. J. Best , Michael C. Liu , Eugene A. Magnier , Trent J. Dupuy

We present three new nearby L dwarf candidates, found in a continued combined color/proper motion search using WISE, 2MASS, and other survey data, where we included extended WISE sources and looked closer to the Galactic plane region. Their…

Solar and Stellar Astrophysics · Physics 2018-02-26 Ralf-Dieter Scholz , Cameron P. M. Bell

We present the discovery of a T dwarf, 2M2151-4853, via differential imaging through methane filters. The filters are designed to highlight the strong absorption in the H band, due to methane found in the atmospheres of T dwarfs, and…

We present ZJHKL'M' photometry of a sample of 58 late-M, L, and T dwarfs, most of which are identified from the Sloan Digital Sky Survey and the Two Micron All-Sky Survey. Near-infrared spectra and spectral classifications for most of this…

Astrophysics · Physics 2009-11-07 S. K. Leggett , D. A. Golimowski , X. Fan , T. R. Geballe , G. R. Knapp
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