Results 71 to 80 of about 222,937 (306)
Proper motions of field L and T dwarfs [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 Accepted for publication in MNRAS, 16 pages, 8 tables, 8 ...
Simon Hodgkin +7 more
openaire +4 more sources
Advanced Engineering Materials, EarlyView.This study explores aerosol jet‐printed (AJP) surface roughness, its effects on the performance of microwave electronics, and its process contributors. First, an electromagnetic model is vetted for AJP's unique roughness signature. Simulations are built which show process‐induced roughness is as significant as conductor resistivity in driving microwave
Christopher Areias, Alkim Akyurtlu
wiley +1 more source
A Possible Correlation between Metallicity and Near-IR Color for Late-M and L Dwarfs
The Astrophysical JournalWe examine the relationship between metallicity and J − K color for 64 benchmark late-M and L dwarfs, all of which are wide companions to higher-mass stars, and six of which are new discoveries.
Ruihan Zhang +2 more
doaj +1 more source
The ultracool-field dwarf luminosity-function and space density from the Canada-France Brown Dwarf Survey [PDF]
, 2010 Context. Thanks to recent and ongoing large scale surveys, hundreds of brown dwarfs have been discovered in the last decade. The Canada-France Brown Dwarf Survey is a wide-field survey for cool brown dwarfs conducted with the MegaCam camera on the Canada-France-Hawaii Telescope telescope. Aims.
arxiv +1 more source
IZphotometry of L dwarfs and the implications for brown dwarf surveys [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 The I-Z colour has been recently shown to be a good temperature indicator for M dwarfs. We present the first IZ photometry of a small sample of L dwarfs ranging in spectral type from L0.5V to L6.0V. We find that the I-Z colour is not a good temperature indicator for objects between L1V and L5V, such objects having colours that overlap with mid M dwarfs.
Iain A. Steele, Lee Howells
openaire +3 more sources
Inter‐Layer Diffusion of Excitations in 2D Perovskites Revealed by Photoluminescence Reabsorption
Advanced Functional Materials, EarlyView.Inter‐layer diffusion of photoexcitations is monitored in thin films of the 2D perovskite (PEA)2PbI4 by tracking time‐dependent changes in photoluminescence spectra induced by photon reabsorption effects. A low out‐of‐plane excitation diffusion coefficient of 0.26 × 10−4 cm2 s−1 is determined through 1D diffusion modeling.
Jiaxing Du +7 more
wiley +1 more source
Confirming new white dwarf-ultracool dwarf binary candidates [PDF]
, 2020 We present the results of a study to discover prospective new white dwarf-L dwarf binaries as identified by their near-infrared excesses in the UKIDSS catalogue. We obtained optical spectra to validate the white dwarf nature for 22 of the candidate primary stars, confirming ten as white dwarfs and determining their effective temperatures and gravities.
arxiv +1 more source
DISCOVERY OF FOUR HIGH PROPER MOTION L DWARFS, INCLUDING A 10 pc L DWARF AT THE L/T TRANSITION, [PDF]
The Astrophysical Journal, 2013 We discover four high proper motion L dwarfs by comparing the Wide-field Infrared Survey Explorer (WISE) to the Two Micron All Sky Survey (2MASS). WISE J140533.32+835030.5 is an L dwarf at the L/T transition with a proper motion of 0.85+/-0.02" yr^-1, previously overlooked due to its proximity to a bright star (V=12 mag).
Philip J. Castro +9 more
openaire +6 more sources
Exciton Dynamics in Layered Halide Perovskite Light‐Emitting Diodes
Advanced Materials, EarlyView.This review discusses the exciton dynamics in layered halide perovskitelight‐emitting diodes (PeLEDs). It opens with a summary of the structural and photophysical aspects, followed by an exploration of controlling dimensionality and cascade exciton transfer in quasi‐2D PeLEDs.
Sung‐Doo Baek +5 more
wiley +1 more source
Intercomparison of Brown Dwarf Model Grids and Atmospheric Retrieval Using Machine Learning
The Astrophysical Journal, 2023 Understanding differences between substellar spectral data and models has proven to be a major challenge, especially for self-consistent model grids that are necessary for a thorough investigation of brown dwarf atmospheres.
Anna Lueber +6 more
doaj +1 more source