Results 111 to 120 of about 10,855,464 (193)

A Survey of Model Fits to Brown Dwarf Spectra Through the L–T Sequence

The Astronomical Journal
We fit archival near-IR spectra of ∼300 brown dwarfs with atmosphere models from the Sonora and Phoenix groups. Using the parameters of the best-fit models as estimates for the physical properties of the brown dwarfs in our sample, we have performed a ...
Savanah K. Turner, Denise C. Stephens, Conner B. Scoresby, Josh A. Miller   +3 more
doaj   +1 more source

The Kinematic Age of the Coolest T Dwarfs

, 2013
Article version of a poster paper at Cool Stars 17, Barcelona, June ...
Smith, Leigh, Lucas, Philip, Burningham, Ben, Jones, Hugh, Smart, Ricky, Pinfield, David, Marocco, Federico, Clarke, James   +7 more
openaire   +2 more sources

Discovery of a t dwarf plus white dwarf binary system

, 2011
27
Day-Jones, A. C., Pinfield, D. J., Ruiz González, María Teresa, Beaumont, H., Burningham, B., Gallardo, J., Gianninas, A., Bergeron, P., Napiwotzki, R., Jenkins, James Stewart, Zhang, Z. H., Murray, D. N., Catalán, S., Gomes, J.   +13 more
openaire   +5 more sources

DISCOVERY OF 11 NEW T DWARFS IN THE TWO MICRON ALL SKY SURVEY, INCLUDING A POSSIBLE L/T TRANSITION BINARY

, 2007
We present the discovery of 11 new T dwarfs, found during the course of a photometric survey for mid-to-late T dwarfs in the 2MASS Point Source Catalog and from a proper-motion-selected sample of ultracool dwarfs in the 2MASS Working Database.
J. Davy Kirkpatrick, Dagny L. Looper, Adam J. Burgasser   +2 more
core   +1 more source

Di scovery of a T dwarf + white dwarf binary system

, 2011
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 ...
Day-Jones, A.C., Ruiz, M.T., Jenkins, J.S.   +2 more
openaire   +4 more sources

On the Orbit of the Binary Brown Dwarf Companion GL229 Ba and Bb

The Astronomical Journal
The companion GL229B was recently resolved by Xuan et al. as a tight binary of two brown dwarfs (Ba and Bb) through VLTI-GRAVITY interferometry and Very Large Telescope-CRIRES+ radial velocity (RV) measurements.
William Thompson, Dori Blakely, Jerry W. Xuan, Alexandre Bouchard-Côté, Guillaume Bourdarot, Miguel Biron-Lattes, Trevor Campbell, Frank Eisenhauer, Thomas Henning, Markus Janson, Doug Johnstone, Jens Kammerer, Quinn Konopacky, Sylvestre Lacour, Christian Marois, Dimitri Mawet, Antoine Mérand, Jayke Samson Nguyen, Eric Nielsen, Emily Rickman, Jean-Baptiste Ruffio, Nikola Surjanovic, Jason J. Wang, Thomas Winterhalder   +23 more
doaj   +1 more source

Cool versus ultracool white dwarfs [PDF]

, 2005
A preliminary BVRIJHK analysis of the white dwarfs SSSPM J2231-7514 and SSSPM J2231-7515 is presented. Although both stars were reported to have T eff < 4000 K, the analysis here indicates T eff ≈ 4250 K for both SSSPM J2231-7514 and SSSPM J2231-7515 ...
Farihi, J
core  

A Volume-limited Sample of Ultracool Dwarfs. II. The Substellar Age and Mass Functions in the Solar Neighborhood

The Astrophysical Journal
We present the most precise constraints to date for the mass and age distributions of single ultracool dwarfs in the solar neighborhood, based on an updated volume-limited sample of 504 L, T, and Y dwarfs within 25 pc.
William M. J. Best, Aniket Sanghi, Michael C. Liu, Eugene A. Magnier, Trent J. Dupuy   +4 more
doaj   +1 more source

Constraints on Remnant Planetary Systems as a Function of Main-sequence Mass with HST/COS

The Astrophysical Journal
As the descendants of stars with masses less than 8 M _⊙ on the main sequence, white dwarfs provide a unique way to constrain planetary occurrence around intermediate-mass stars (spectral types BAF) that are otherwise difficult to measure with radial ...
Lou Baya Ould Rouis, J. J. Hermes, Boris T. Gänsicke, Snehalata Sahu, Detlev Koester, P.-E. Tremblay, Dimitri Veras, Jay Farihi, Tyler M. Heintz, Nicola Pietro Gentile Fusillo, Seth Redfield   +10 more
doaj   +1 more source

The Sonora Substellar Atmosphere Models. IV. Elf Owl: Atmospheric Mixing and Chemical Disequilibrium with Varying Metallicity and C/O Ratios

The Astrophysical Journal
Disequilibrium chemistry due to vertical mixing in the atmospheres of many brown dwarfs and giant exoplanets is well established. Atmosphere models for these objects typically parameterize mixing with the highly uncertain K _zz diffusion parameter.
Sagnick Mukherjee, Jonathan J. Fortney, Caroline V. Morley, Natasha E. Batalha, Mark S. Marley, Theodora Karalidi, Channon Visscher, Roxana Lupu, Richard Freedman, Ehsan Gharib-Nezhad   +9 more
doaj   +1 more source