Results 51 to 60 of about 71,830 (288)

Near-infrared Detection of WD 0806-661 B with the Hubble Space Telescope [PDF]

, 2014
WD 0806-661 B is one of the coldest known brown dwarfs (T=300-345 K) based on previous mid-infrared photometry from the Spitzer Space Telescope. In addition, it is a benchmark for testing theoretical models of brown dwarfs because its age and distance ...
A. J. Burgasser, C. V. Morley, J. J. Bochanski, K. L. Luhman, T. L. Esplin   +4 more
core   +3 more sources

A deep WISE search for very late type objects and the discovery of two halo/thick-disc T dwarfs : WISE 0013+0634 and WISE 0833+0052 [PDF]

, 2013
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Bejar, V. J. S., Burningham, B., Cardoso, C., Cattermole, T., Clarke, J. R. A., Day-Jones, A. C., Faherty, J., Galvez-Ortiz, M. C., Gauza, B., Gomes, J., Gromadzki, M., Irwin, M., Jenkins, J. S., Jones, H.R.A., Kurtev, R., Leggett, S.K., Littlefair, S., Lodieu, N., Lucas, P.W., Pinfield, D.J., Rebolo, R., Ruiz, M. T., Smart, R., Smith, Leigh   +23 more
core   +4 more sources

Atmospheric Retrieval Of Cool Y Dwarfs

, 2017
Brown dwarfs' near-infrared spectra contain a wealth of information which can reveal the physical and chemical processes that occur in their atmospheres. Using a recently developed atmospheric retrieval model, we are able to constrain various molecular abundances, along with photometric radius, gravity, cloud optical depths, and temperature profiles ...
Zalesky, Joseph, Line, Michael, Schneider, Adam   +2 more
openaire   +1 more source

FIRE Spectroscopy of Five Late-type T Dwarfs Discovered with the Wide-field Infrared Survey Explorer [PDF]

, 2011
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 water and ...
Bauer, James M., Bochanski, John J., Burgasser, Adam J., Cushing, Michael C., Gelino, Christopher R., Griffith, Roger L., Kirkpatrick, J. Davy, Looper, Dagny L., Mainzer, A., Marsh, Kenneth A., Simcoe, Robert A., Skrutskie, Michael F., Thompson, Maggie A., Tinney, Christopher, Wright, Edward L.   +14 more
core   +3 more sources

New Y and T Dwarfs from WISE Identified by Methane Imaging* ^† [PDF]

The Astrophysical Journal Supplement Series, 2018
Abstract We identify new Y- and T-type brown dwarfs from the WISE All Sky data release using images obtained in filters that divide the traditional near-infrared H and J bands into two halves—specifically and CH4l in the H and J2, and J3 in the J.
C. G. Tinney, J. Davy Kirkpatrick, Jacqueline K. Faherty, Gregory N. Mace, Mike Cushing, Christopher R. Gelino, Adam J. Burgasser, Scott S. Sheppard, Edward L. Wright   +8 more
openaire   +3 more sources

The discovery of a T6.5 subdwarf [PDF]

, 2014
We report the discovery of ULAS J131610.28+075553.0, an sdT6.5 dwarf in the UKIDSS Large Area Survey 2 epoch proper motion catalogue. This object displays significant spectral peculiarity, with the largest yet seen deviations from T6 and T7 templates in ...
A. J. Burgasser, Allard, Baffa, Ben Burningham, Bensby, Bensby, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burgasser, Burningham, Burningham, Burningham, Burningham, Burrows, C. V. Cardoso, Cooke, Cushing, Cushing, Delorme, Delorme, Dupuy, Dupuy, Elias, Goldman, Golimowski, H. R. A. Jones, Janson, Kirkpatrick, Kirkpatrick, Knapp, Kuzuhara, L. Smith, Lawrence, Liu, Lodieu, Mace, Mace, Murray, P. W. Lucas, Pinfield, Pinfield, R. L. Smart, Rayner, Rojas-Ayala, Saumon, Saumon, Skrutskie, Smith, Soubiran, Thalmann, Tinney, Vacca, Woolf, Wright, York   +57 more
core   +2 more sources

Photometric brown-dwarf classification. II. A homogeneous sample of 1361 L and T dwarfs brighter than J = 17.5 with accurate spectral types [PDF]

, 2016
We present a homogeneous sample of 1361 L and T dwarfs brighter than J = 17.5 (of which 998 are new), from an effective area of 3070 deg2, classified by the photo-type method to an accuracy of one spectral sub-type using izYJHKW1W2 photometry from SDSS ...
Faherty, J. K., Skrzypek, N., Warren, S. J.   +2 more
core   +2 more sources

Physical Parameters and Properties of 20 Cold Brown Dwarfs in JWST

The Astrophysical Journal
We present a comprehensive analysis of 20 T and Y dwarfs using spectroscopy from the Near-Infrared Spectrograph (NIRSpec) CLEAR/PRISM and Mid-Infrared Instrument (MIRI) low-resolution spectrometer instruments on the James Webb Space Telescope.
Zhijun Tu, Shu Wang, Jifeng Liu
doaj   +1 more source

Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210

The Astrophysical Journal, 2023
Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters ...
Chengyuan Li, Xin Ji, Long Wang, Yue Wang, Baitian Tang, Antonino P. Milone, Yujiao Yang, Holger Baumgardt, Dengkai Jiang   +8 more
doaj   +1 more source

The 2MASS Wide-Field T Dwarf Search. IV Unting out T dwarfs with Methane Imaging

, 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, C. G. Tinney, Delfosse X., J. Davy Kirkpatrick, Jones H. R. A., Jones H. R. A., Low C., Michael W. McElwain, Tinney C. G.   +8 more
core   +1 more source