Results 11 to 20 of about 6,740 (303)

The Classification of T Dwarfs [PDF]

, 2001
We discuss methods for classifying T dwarfs based on spectral morphological features and indices. T dwarfs are brown dwarfs which exhibit methane absorption bands at 1.6 and 2.2 μm.
Brown, M. E., M.E. Brown, J.D. Kirkpatrick, Kirkpatrick, J. D., A.J. Burgasser, Burgasser, A. J.   +5 more
core   +4 more sources

A Survey for Hα Emission from Late L Dwarfs and T Dwarfs [PDF]

The Astrophysical Journal, 2016
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.
Kirkpatrick, JD, Pineda, JS, Kao, MM, Cotter, Garret, Mooley, Kunal P., Pineda, J. Sebastian, Kao, Melodie M., Cotter, G, Mooley, Kunal, Mooley, KP, Hallinan, Gregg, Hallinan, G, Kirkpatrick, J. Davy   +12 more
core   +5 more sources

Infrared photometry of late-M, L, and T dwarfs [PDF]

The Astrophysical Journal, 2002
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.
Ivezic, Z, Smyth, J A, Fan, X H, Hawley, S L, Lupton, R H, Golimowski, D A, York, D G, Gunn, J E, Csabai, I, Uomoto, A, Geballe, T R, Knapp, G R, Pier, J R, Henry, T J, Hindsley, R, Schneider, D P, Leggett, S K, Brinkmann, J, Strauss, M A   +18 more
core   +5 more sources

37 New T-type Brown Dwarfs in the Canada-France Brown Dwarfs survey

The Astronomical Journal, 2011
The Canada-France Brown Dwarfs Survey is an i'- and z'-band survey realized with MegaCam at the Canada-France-Hawaii Telescope that covers a surface area of 780 deg(2).
Delfosse, X., Artigau, E., Reyle, C\ue9line, Reylé, C., Delfosse, Xavier, Artigau, \uc9tienne, Forveille, Thierry, Albert, L., Willott, C., Delorme, Philippe, Albert, Lo\uefc, Forveille, T., Willott, Chris J., Delorme, P.   +13 more
core   +5 more sources

Space velocities of L- and T-TYPE dwarfs

The Astrophysical Journal, 2007
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. We have confirmed that the radial velocity of G1 570D is coincident with that of
Zapatero Osorio, M. R., Martin, E. L., Deshpande, R., Wainscoat, R. J., Béjar, V. J. S., Bouy, H.   +5 more
core   +4 more sources

A cross-match of 2MASS and SDSS: newly found L and T dwarfs and an estimate of the space density of T dwarfs [PDF]

The Astrophysical Journal, 2008
We report new L and T dwarfs found in a cross-match of the SDSS Data Release 1 and 2MASS. Our simultaneous search of the two databases effectively allows us to relax the criteria for object detection in either survey and to explore the combined databases
Berriman, G. Bruce, Looper, Dagny, Kirkpatrick, J. Davy, Metchev, Stanimir A.   +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, D. J. Pinfield, M. T. Ruiz, H. Beaumont, B. Burningham, J. Gallardo, A. Gianninas, P. Bergeron, R. Napiwotzki, J. S. Jenkins, Z. H. Zhang, D. N. Murray, S. Catalán, J. Gomes   +13 more
openaire   +3 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, Thomas R. Geballe, David A. Golimowski, Sandy K. Leggett, J. Davy Kirkpatrick, Gillian R. Knapp, Xiaohui Fan   +6 more
openaire   +1 more source

Two T dwarfs from the UKIDSS early data release

, 2007
Contains fulltext : 36642.pdf ( ) (Open Access) Contains fulltext : 36642.pdf (Publisher’s version ) (Open Access)Context: We report on the first ultracool dwarf discoveries from the ...
Carraro, G, H. R. A. Jones, G. Chabrier, Deacon, N, Pavlenko, YV, Chappelle, R.J., Chabrier, G., Tadashi, N, Tinney, CG, Tadashi, N., Tamura, M, Baraffe, I., Deacon, N.R., G. Carraro, Casewell, S.L., Leggett, S.K., Deacon, Niall, Casewell, SL, Folkes, S, Tinney, C.G., C. G. Tinney, Pinfield, DJ, Jameson, R.F., Pavlenko, Y.V., Lucas, PW, Y. V. Pavlenko, Folkes, S., Dobbie, PD, Day-Jones, A., M. R. Zapatero Osorio, I. Baraffe, Magazzù, A., R. F. Jameson, Dobbie, P.D., Clarke, F., Martín, E.L., R. J. Chappelle, E. L. Martín, M. Ishii, Navascués, D. Barrado Y, Jones, H.R.A., Hodgkin, ST, S. Folkes, S. K. Leggett, Hambly, N.C., S. T. Hodgkin, N. C. Hambly, Hambly, NC, Kendall, TR, Ishii, M, P. C. Hewett, N. Lodieu, Allard, F., Lodieu, N., McCaughrean, MJ, Lodieu, N, Allard, F, Navascues, DBY, Clarke, Fraser, Chappelle, RJ, T.R. Kendall, F. Clarke, Leggett, SK, F. Allard, D. Barrado y Navascués, D. Barrado y. Navascués, P. D. Dobbie, Nakajima, T., A. Day Jones, A. Magazzù, N. Tadashi, Dye, S., Lucas, P.W., D. J. Pinfield, Hewett, PC, T. Nakajima, Chabrier, G, Clarke, F, CARRARO, GIOVANNI, Ishii, M., Jameson, RF, Hodgkin, S.T., S. L. Casewell, Tamura, M., S. Dye, M. Tamura, Martin, EL, Kendall, T.R., Pinfield, D.J., Osorio, MRZ, Hewett, P.C., Baraffe, I, M. J. McCaughrean, Osorio, M.R. Zapatero, Dye, S, A. Day-Jones, Magazzu, A, McCaughrean, M.J., T. R. Kendall, Carraro, G., P. W. Lucas, Nakajima, T, Jones, HRA, Day-Jones, A, N. Deacon   +104 more
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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., Gelino, Christopher R., Cushing, Michael C., Kirkpatrick, J. Davy   +3 more
openaire   +3 more sources