Results 51 to 60 of about 22,040,331 (192)

The GALAH Survey : Lithium-strong KM dwarfs [PDF]

, 2019
Identifying and characterizing young stars in the Solar neighbourhood is essential to find and describe planets in the early stages of their evolution. This work seeks to identify nearby young stars showing a lithium 6708 Å absorption line in the GALAH ...
Martell, S.,, Traven, G., Zwitter, T., Casagrande, L., De Silva, G., Horner, J., De Silva, G.,, Martell, S., Nordlander, T., Buder, S.,, Zerjal, M., GALAH Collaboration, Nordlander, T.,, Buder, S., Casagrande, L.,, Lin, J., Čotar, K., Åotar, K.,, Zwitter, T.,, Ireland, M. J.,, Collaboration, G., Åotar, K., Ireland, M., Ireland, M. J., Zerjal, M.,, Horner, J.,, Lin, J.,, Buder, Sven, De Silva, Gayandhi, Žerjal, Maruša, Casagrande, Luca, Nordlander, Thomas, Ireland, Michael, Lin, Jane, Martell, Sarah, Horner, Jonathan   +35 more
core   +1 more source

Infrared Excesses around Bright White Dwarfs from Gaia and unWISE. II [PDF]

, 2021
Infrared excesses around white dwarf stars indicate the presence of various astrophysical objects of interest, including companions and debris disks. In this second paper of a series, we present follow-up observations of infrared excess candidates from ...
Kleinman, Scot J., Rebassa Mansergas, Alberto, Leggett, Sandy, Nitta, Atsuko, Bonsor, Amy, Dennihy, Erik, Hodgkin, Simon, Lai, Samuel, Xu, Siyi, Leggett, S. K., Rebassa-Mansergas, Alberto, Rogers, Laura K., Kleinman, Scott J., Rogers, L. K., Samuel Lai, Simon Hodgkin, Scot Kleinman, Amy Bonsor, Laura K. Rogers, Erik Dennihy, S. K. Leggett, Atsuko Nitta, Siyi Xu, Alberto Rebassa-Mansergas   +23 more
core   +1 more source

Dynamics of Y dwarf atmospheres

Astronomy & Astrophysics
Context . The global circulation regime of the coolest class of brown dwarfs, known as the Y dwarfs, remains largely unexplored. Aims .
C. Akın, E. K. H. Lee, L. Gkouvelis, K. Heng   +3 more
openaire   +2 more sources

Keck NIRES Spectral Standards for L, T, and Y Dwarfs

Research Notes of the AAS, 2022
Abstract We present medium-resolution (λ/Δλ = 2700), near-infrared spectral standards for field L0–L2, L4, and L7–Y0 dwarfs obtained with the Near-Infrared Echellette Spectrometer on the Keck II 10 m telescope. These standards allow for detailed spectral comparative analysis of cold brown dwarfs discovered through ongoing ground-based ...
Christopher A. Theissen, Adam J. Burgasser, Emily C. Martin, Michael C. Cushing, Quinn M. Konopacky, Ian S. McLean, Chih-Chun Hsu, Daniella C. Bardalez Gagliuffi, Adam C. Schneider, Marc J. Kuchner, Jacqueline K. Faherty, Charles A. Beichman, Brittany Miles, Andy Skemer, Sarah E. Logsdon, Aaron M. Meisner, J. Davy Kirkpatrick   +16 more
openaire   +2 more sources

CFBDS J005910.90-011401.3: reaching the T-Y brown dwarf transition? [PDF]

Astronomy & Astrophysics, 2008
12 pages, Submitted to A& ...
Delorme, Philippe, Delfosse, Xavier, Albert, Loic, Artigau, Etienne., Forveille, Thierry, Reylé, Céline, Allard, France, Homeier, Derek, Robin, Annie, Willott, Chris, Liu, Michael, Dupuy, Trent   +11 more
openaire   +6 more sources

THE FIRST DETECTION OF PHOTOMETRIC VARIABILITY IN A Y DWARF: WISE J140518.39+553421.3 [PDF]

The Astrophysical Journal, 2016
ABSTRACT We present the first detection of the photometric variability in a spectroscopically confirmed Y dwarf. The Infrared Array Camera on board the Spitzer Space Telescope was used to obtain time series photometry of WISE J140518.39+553421.3 at 3.6 and 4.5
Michael C. Cushing, Kevin K. Hardegree-Ullman, Jesica L. Trucks, Caroline V. Morley, John E. Gizis, Mark S. Marley, Jonathan J. Fortney, J. Davy Kirkpatrick, Christopher R. Gelino, Gregory N. Mace, Sean J. Carey   +10 more
openaire   +4 more sources

The discovery of y dwarfs using data from the wide-field infrared survey explorer (WISE) [PDF]

, 2011
We present the discovery of seven ultracool brown dwarfs identified with the Wide-field Infrared Survey Explorer (WISE). Near-infrared spectroscopy reveals deep absorption bands of H[subscript 2]O and CH[subscript 4] that indicate all seven of the brown ...
Gelino, Christopher R., D. Saumon, Richard S. Freedman, Roger L. Griffith, A. Mainzer, Adam J. Burgasser, Michael C. Cushing, Robert A. Simcoe, Christopher R. Gelino, Cushing, Michael C., Peter R. Eisenhardt, Marley, Mark S., Burgasser, Adam J., Prato, Lisa A., Eisenhardt, P. R., Griffith, Roger L., Marsh, Kenneth A., Lisa A. Prato, Edward L. Wright, Beichman, Charles A., J. Davy Kirkpatrick, Freedman, Richard S., Wright, Edward L., Mark S. Marley, Skrutskie, Michael F., Mainzer, A., Charles A. Beichman, Kenneth A. Marsh, Simcoe, Robert A., Saumon, D., Kirkpatrick, J. Davy, Michael F. Skrutskie   +31 more
core   +1 more source

CARMENES input catalogue of M dwarfs [PDF]

Aims. Our goals are to characterise the kinematic properties and to identify young and old stars among the M dwarfs of the CARMENES input catalogue. Methods.
Jeffers, S., V. J. S. Béjar, Caballero, J. A., Ribas, Ignasi, C. Cardona-Guillén, N. Lodieu, D. Montes, Schöfer, P., Montes, D., Ribas, I., Lodieu, N., Schweitzer, A., Seifert, W., C. Cifuentes, Cardona Guillén, C., Zapatero Osorio, M., Lodieu, Nicolas, Béjar, V., M. Lafarga, A. Quirrenbach, A. Reiners, Lafarga, M., P. Schöfer, Caballero, J., M. R. Zapatero Osorio, Cortés-Contreras, M., Zapatero Osorio, María Rosa, Reiners, Ansgar, Cifuentes, C., W. Seifert, H. M. Tabernero, Schweitzer, Andreas, Béjar, Victor J. S., Montes, David, Cardona-Guillén, C., Quirrenbach, Andreas, Amado, P., Jeffers, Sandra V., S. V. Jeffers, I. Ribas, P. J. Amado, A. Schweitzer, Tabernero, H., M. Cortés-Contreras, Tabernero, H. M., Quirrenbach, A., Amado, Pedro J., Reiners, A., J. A. Caballero, Amado, P. J., Zapatero Osorio, M. R., Cortés Contreras, Miriam, Béjar, V. J. S., Jeffers, S. V., Montes Gutiérrez, David   +54 more
core   +1 more source

Understanding the Energy Input Required for Methane Emission on CWISEP J193518.59-154620.3: A Comprehensive Analysis

The Astrophysical Journal
The Y dwarf CWISEP J193518.59-154620.3 (WISE 1935 or W1935) exhibits a thermal inversion in its radiative atmosphere, producing methane emission features in its JWST spectrum, but the physical mechanism responsible for this inversion remains unknown ...
Kayla J. Smith, Mark S. Marley, Tommi T. Koskinen, James Mang   +3 more
doaj   +1 more source

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   +2 more sources