Results 11 to 20 of about 179,911 (296)

Water Clouds in Y Dwarfs and Exoplanets [PDF]

The Astrophysical Journal, 2014
The formation of clouds affects brown dwarf and planetary atmospheres of nearly all effective temperatures. Iron and silicate condense in L dwarf atmospheres and dissipate at the L/T transition.
Fortney, Jonathan J., Greene, Tom, Lodders, Katharina, Lupu, Roxana, Marley, Mark S., Morley, Caroline V., Saumon, Didier   +6 more
core   +7 more sources

Y Dwarfs: The Challenge of Discovering the Coldest Substellar Population in the Solar Neighborhood [PDF]

arXiv, 2018
Stars form in the Galaxy with a wide range in mass. If the mass is below 7% of the Sun's, then the object does not become hot enough for stable hydrogen burning. These substellar objects are called brown dwarfs. Maps of the sky at infrared wavelengths have found large numbers of brown dwarfs.
S. K. Leggett
arxiv   +6 more sources

Outstanding Issues in Our Understanding of L, T, and Y Dwarfs [PDF]

, 2007
Since the discovery of the first L dwarf 19 years ago and the discovery of the first T dwarf 7 years after that, we have amassed a large list of these objects, now numbering almost six hundred.
Kirkpatrick, J. Davy
core   +6 more sources

JWST 1.5 μm and 4.8 μm Photometry of Y Dwarfs

The Astronomical Journal
Brown dwarfs lack nuclear fusion and cool with time; the coldest known have an effective temperature below 500 K, and are known as Y dwarfs. We present a James Webb Space Telescope (JWST) photometric data set of Y dwarfs: 23 were imaged in wide-field ...
Loïc Albert, Sandy K. Leggett, Per Calissendorff, Thomas Vandal, J. Davy Kirkpatrick, Daniella C. Bardalez Gagliuffi, Matthew De Furio, Michael Meyer, Charles A. Beichman, Adam J. Burgasser, Michael C. Cushing, Jacqueline Kelly Faherty, Clémence Fontanive, Christopher R. Gelino, John E. Gizis, Alexandra Z. Greenbaum, Frantz Martinache, Mamadou N’Diaye, Benjamin J. S. Pope, Thomas L. Roellig, Johannes Sahlmann, Anand Sivaramakrishnan, Marie Ygouf   +22 more
doaj   +3 more sources

Two Extraordinary Substellar Binaries at the T/Y Transition and the Y-Band Fluxes of the Coolest Brown Dwarfs [PDF]

The Astrophysical Journal, 2012
Using Keck laser guide star adaptive optics imaging, we have found that the T9 dwarf WISE J1217+1626 and T8 dwarf WISE J1711+3500 are exceptional binaries, with unusually wide separations (~0.8 arcsec, 8-15 AU), large near-IR flux ratios (~2-3 mags), and
Artigau, Bochanski, Brendan P. Bowler, Burrows, Burrows, Cushing, Dupuy, Dupuy, Dupuy, Gelino, Ghez, Golimowski, Green, Kirkpatrick, Kirkpatrick, Kirkpatrick, Knapp, Lafrenière, Leggett, Leggett, Leggett, Leggett, Liu, Liu, Liu, Liu, Liu, Liu, Liu, Lodders, Luhman, Markwardt, Marley, Michael C. Liu, Monet, Morley, Pravdo, S. K. Leggett, Saumon, Saumon, Spiegel, Trent J. Dupuy, Warren, William M. J. Best   +43 more
core   +5 more sources

Near-infrared photometry of Y dwarfs: low ammonia abundance and the onset of water clouds [PDF]

The Astrophysical Journal, 2014
We present new near-infrared photometry for seven late-type T dwarfs and nine Y-type dwarfs, and lower limit magnitudes for a tenth Y dwarf, obtained at Gemini Observatory. We also present a reanalysis of H-band imaging data from the Keck Observatory Archive, for an eleventh Y dwarf.
S. K. Leggett, Caroline Morley, Mark S. Marley, D. Saumon   +3 more
arxiv   +6 more sources

Searching for Binary Y dwarfs with the Gemini Multi-Conjugate Adaptive Optics System (GeMS) [PDF]

The Astrophysical Journal, 2016
The NASA Wide-field Infrared Survey Explorer (WISE) has discovered almost all the known members of the new class of Y-type brown dwarfs. Most of these Y dwarfs have been identified as isolated objects in the field. It is known that binaries with L- and T-type brown dwarf primaries are less prevalent than either M-dwarf or solar-type primaries, they ...
Faherty, Jacqueline K., Gelino, Christopher R., Kirkpatrick, J. Davy, Opitz, Daniela, Sweet, Sarah M., Tinney, C. G.   +5 more
arxiv   +11 more sources

The Minimum Jeans Mass, Brown Dwarf Companion IMF, and Predictions for Detection of Y-type Dwarfs [PDF]

Astronomy & Astrophysics, 2008
Cool L- and T-type objects were discovered first as companions to stars in 1988 and 1995, respectively. A certain example of the yet cooler Y-type spectral class (Teff
Allen, Allen, B. Zuckerman, Baraffe, Barnes, Bate, Becklin, Bessell, Boyd, Burgasser, Burgasser, Burgasser, Burrows, Chauvin, Chauvin, Chauvin, Chauvin, Chen, Close, Delorme, Els, Farihi, Fischer, Gaidos, Geballe, Geballe, Gizis, Golimowski, I. Song, Itoh, Kasper, Kasper, Kirkpatrick, Kirkpatrick, Kirkpatrick, Konopacky, Lafrenière, Lane, Liu, Low, Lowrance, Lowrance, Luhman, Luhman, Marcy, Marois, Masciadri, McElwain, McElwain, Metchev, Metchev, Mohanty, Mugrauer, Nakajima, Neuhauser, Nielsen, Nordström, Norman, Padoan, Padoan, Potter, Rafikov, Rebolo, Rice, Scholz, Seifahrt, Song, Song, Tokovinin, Warren, White, Whitworth, Wilson, Zuckerman, Zuckerman   +74 more
core   +5 more sources

Precise Bolometric Luminosities and Effective Temperatures of 23 Late-T and Y Dwarfs Obtained with JWST [PDF]

The Astrophysical Journal
We present infrared spectral energy distributions of 23 late-type T and Y dwarfs obtained with the James Webb Space Telescope. The spectral energy distributions consist of NIRSpec PRISM and MIRI low-resolution spectrometer spectra covering the ∼1–12 μ m ...
Samuel A. Beiler, Michael C. Cushing, J. Davy Kirkpatrick, Adam C. Schneider, Sagnick Mukherjee, Mark S. Marley, Federico Marocco, Richard L. Smart   +7 more
doaj   +5 more sources

Spectral Variability from the Patchy Atmospheres of T and Y Dwarfs [PDF]

The Astrophysical Journal, 2014
Brown dwarfs of a variety of spectral types have been observed to be photometrically variable. Previous studies have focused on objects at the L/T transition, where the iron and silicate clouds in L dwarfs break up or dissipate.
Fortney, Jonathan J., Lupu, Roxana, Marley, Mark S., Morley, Caroline V.   +3 more
core   +6 more sources