Results 1 to 10 of about 15,774,260 (349)

Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph: Equatorial Latitudes in L Dwarf Atmospheres Are Cloudier [PDF]

The Astrophysical Journal Letters, 2023
We report direct observational evidence for a latitudinal dependence of dust cloud opacity in ultracool dwarfs, indicating that equatorial latitudes are cloudier than polar latitudes.
Genaro Suárez, Johanna M. Vos, Stanimir Metchev, Jacqueline K. Faherty, Kelle Cruz   +4 more
doaj   +2 more sources

L-dwarf Detection from SDSS Images using Improved Faster R-CNN

The Astronomical Journal, 2023
We present a data-driven approach to automatically detect L dwarfs from Sloan Digital Sky Survey (SDSS) images using an improved Faster R-CNN framework based on deep learning.
Zhi Cao, Zhenping Yi, Jingchang Pan, Hao Su, Yude Bu, Xiao Kong, Ali Luo   +6 more
doaj   +2 more sources

The ages of L dwarfs

Monthly Notices of the Royal Astronomical Society, 2008
We present a new method to derive the age of young (
N. P. Bannister (7590155), P. D. Dobbie (7589999), N. Lodieu (7579700), R. F. Jameson (7590425), S. L. Casewell (7589996)   +4 more
core   +5 more sources

Kepler and L Dwarfs [PDF]

, 2014
I presented results from the original Kepler and new K2 missions on L dwarfs. The L1 dwarf star WISE 1906 was monitored with both Spitzer and Kepler, revealing variability and evidence of both clouds and flares.
Gizis, John (5302501), Gizis, John
core   +2 more sources

Atmospheres of brown dwarfs

Astronomy and Astrophysics Review, 2014
ChH highlights financial support of the European Community under the FP7 by an ERC starting grant. SLC acknowledges financial support of University of LeicesterBrown Dwarfs are the coolest class of stellar objects known to date. Our present perception is
Ch Helling, Sarah L Casewell, Helling Christiane   +2 more
exaly   +2 more sources

The Classification of L Dwarfs

, 2001
To highlight the need for new spectral types, a brief review of the discovery of very low luminosity dwarfs — cooler than type M9.5 — is presented. The reasoning behind the choice of letters “L” and “T” is also given.
Kirkpatrick, J. D., J.D. Kirkpatrick
core   +3 more sources

OPTICAL SPECTRA OF L - DWARFS

Odessa Astronomical Publications, 2017
Theoretical spectra, of L-dwarfs (Teff
Ya. Pavlenko
doaj   +3 more sources

A Survey for Hα Emission from Late L Dwarfs and T Dwarfs [PDF]

The Astrophysical Journal, 2016
Recently, studies of brown dwarfs have demonstrated that they possess strong magnetic fields and have the potential to produce radio and optical auroral emissions powered by magnetospheric currents.
Kirkpatrick, JD, Pineda, JS, Kao, MM, Cotter, Garret, Mooley, Kunal P., Pineda, J. Sebastian, Kao, Melodie M., Cotter, G, Mooley, Kunal, Mooley, KP, Hallinan, Gregg, Hallinan, G, Kirkpatrick, J. Davy   +12 more
core   +5 more sources

Polarization of L dwarfs by dust scattering [PDF]

The Astrophysical Journal, 2005
The degree of polarization in L dwarfs of spectral types L0-L6 resulting from dust scattering in a rotation-induced oblate photosphere is calculated.
Kwok, S, Sengupta, S
core   +5 more sources

A Focus on L Dwarfs with Trigonometric Parallaxes [PDF]

Publications of the Astronomical Society of the Pacific, 2018
We report new parallax measurements for ten L and early T type dwarfs, five of which have no previous published values, using observations over 3 years at the robotic Liverpool Telescope.
F. Marocco, Zhong, J., H. R. A Jones, Jones, H. R. A, Jones, H. R. A., J. Zhong, Shao, Z., A. Luo, B. Du, Burgasser, A., R. L. Smart, Z. Shao, A. Burgasser, Luo, A., Marocco, F., Y. Wang, Wang, Y., Smart, R. L., Du, B.   +18 more
core   +4 more sources