Modeling Brown Dwarfs, L Dwarfs, and T Dwarfs [PDF]
Symposium - International Astronomical Union, 2003 In this contribution, I review a subset of our recent efforts in spectral and opacity modeling aimed at guiding the study of brown dwarfs, L dwarfs, and T dwarfs. I discuss theoretical calculations of the alkali line profiles, newly generated CrH opacities, new evidence for refractory rainout in T dwarfs from optical spectral measurements, and the ...
Adam Burrows
openalex +4 more sources
Stellar equilibrium configurations of white dwarfs in the f(R, T) gravity
European Physical Journal C: Particles and Fields, 2017 In this work we investigate the equilibrium configurations of white dwarfs in a modified gravity theory, namely, f(R, T) gravity, for which R and T stand for the Ricci scalar and trace of the energy-momentum tensor, respectively.
G. A. Carvalho +6 more
doaj +3 more sources
Beyond the T Dwarfs: Theoretical Spectra, Colors, and Detectability of the Coolest Brown Dwarfs [PDF]
, 2003 We explore the spectral and atmospheric properties of brown dwarfs cooler than the latest known T dwarfs. Our focus is on the yet-to-be-discovered free-floating brown dwarfs in the \teff range from $\sim$800 K to $\sim$130 K and with masses from 25 to 1 \
Adam Burrows, D. Sudarsky, J. I. Lunine
openalex +5 more sources
Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition [PDF]
, 2006 We present the results of a Hubble Space Telescope NICMOS imaging survey of 22 T-type field brown dwarfs. Five are resolved as binary systems with angular separations of 0"05-0"35, and companionship is established on the basis of component F110W-F170M ...
Adam J. Burgasser +7 more
openalex +7 more sources
Spectral Classification and Effective Temperatures of L and T Dwarfs Based on Near‐Infrared Spectra [PDF]
, 2004 We have obtained near-infrared spectra of L dwarfs, L/T transition objects and T dwarfs using Subaru. Resulting spectra are examined in detail to see their dependence on the spectral types.
Tadashi Nakajima +2 more
openalex +3 more sources
Constraining the Distribution of L and T Dwarfs in the Galaxy [PDF]
, 2005 We estimate the thin disk scale height of the Galactic population of L- & T-dwarfs based on star counts from 15 deep parallel fields from the Hubble Space Telescope.
Russell E. Ryan +3 more
openalex +3 more sources
Redder than Red: Discovery of an Exceptionally Red L/T Transition Dwarf
The Astrophysical Journal Letters, 2023 We present the discovery of CWISE J050626.96+073842.4 (CWISE J0506+0738), an L/T transition dwarf with extremely red near-infrared colors discovered through the Backyard Worlds: Planet 9 citizen science project. Photometry from UKIRT and CatWISE give a (
Adam C. Schneider +26 more
doaj +1 more source
Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
The Astrophysical Journal Letters, 2023 We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field.
Mario Nonino +20 more
doaj +1 more source
The Blue Compact Dwarf Galaxy VCC 848 Formed by Dwarf–Dwarf Merging [PDF]
The Astrophysical Journal Letters, 2020 Abstract It has long been speculated that many starburst or compact dwarf galaxies are resulted from dwarf–dwarf galaxy merging, but unequivocal evidence for this possibility has rarely been reported in the literature. We present the first study of deep optical broadband images of a gas-dominated blue compact dwarf galaxy (BCD) VCC 848 ...
Zhang, Hong-Xin +10 more
openaire +7 more sources
Astrometry and Photometry for ≈1000 L, T, and Y Dwarfs from the UKIRT Hemisphere Survey
The Astronomical Journal, 2023 We present the positions, proper motions, and near-infrared photometry for 966 known objects with spectral types later than M that were observed as part of the the UKIRT Hemisphere Survey (UHS).
Adam C. Schneider +7 more
doaj +1 more source