Results 31 to 40 of about 2,436 (245)
DEEPz-BAND OBSERVATIONS OF THE COOLEST Y DWARF [PDF]
The Astrophysical Journal, 2014 WISE J085510.83-071442.5 (hereafter, WISE 0855-07) is the coolest Y dwarf known to date and is located at a distance of 2.31$\pm 0.08$ pc, giving it the fourth largest parallax of any known star or brown dwarf system. We report deep $z$-band observations of WISE 0855-07 using FORS2 on UT1/VLT. We do not detect any counterpart to WISE 0855-07 in our $z$-
Taisiya G. Kopytova +9 more
openaire +2 more sources
SPECTRAL VARIABILITY FROM THE PATCHY ATMOSPHERES OF T AND Y DWARFS [PDF]
The Astrophysical Journal, 2014 Brown dwarfs of a variety of spectral types have been observed to be photometrically variable. Previous studies have focused on objects at the L/T transition, where the iron and silicate clouds in L dwarfs break up or dissipate. However, objects outside of this transitional effective temperature regime also exhibit variability.
Morley, Caroline V +3 more
openaire +4 more sources
An Improved Near-infrared Spectrum of the Archetype Y Dwarf WISEP J182831.08+265037.8 [PDF]
The Astrophysical Journal, 2021 Abstract We present a Hubble Space Telescope/Wide-Field Camera 3 near-infrared spectrum of the archetype Y dwarf WISEP 182831.08+265037.8. The spectrum covers the 0.9–1.7 μm wavelength range at a resolving power of λ/Δλ ≈ 180 and is a significant improvement over the previously published spectrum because it covers a broader wavelength ...
Michael C. Cushing +10 more
openaire +3 more sources
Y Dwarf Trigonometric Parallaxes from the Spitzer Space Telescope [PDF]
The Astrophysical Journal, 2018 Abstract Y dwarfs provide a unique opportunity to study free-floating objects with masses <30 M Jup and atmospheric temperatures approaching those of known Jupiter-like exoplanets. Obtaining distances to these objects is an essential step toward characterizing their absolute physical properties.
Emily C. Martin +14 more
openaire +3 more sources
WISE J163940.83–684738.6: A Y DWARF IDENTIFIED BY METHANE IMAGING [PDF]
The Astrophysical Journal, 2012 We have used methane imaging techniques to identify the near-infrared counterpart of the bright WISE source WISEJ163940.83-684738.6. The large proper motion of this source (around 3.0arcsec/yr) has moved it, since its original WISE identification, very close to a much brighter background star -- it currently lies within 1.5" of the J=14.90+-0.04 star ...
Tinney, CG +7 more
openaire +3 more sources
GTC OSIRISz-band imaging of Y dwarfs [PDF]
Astronomy & Astrophysics, 2013 The aim of the project is to contribute to the characterisation of the spectral energy distribution of the coolest brown dwarfs discovered to date, the Y dwarfs. We obtained z-band far-red imaging for six Y dwarfs and a T9+Y0 binary with the OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy) instrument on the 10.4-m Gran ...
Lodieu, N., Bejar, V. J. S., Rebolo, R.
openaire +2 more sources
Constraints on magnetospheric radio emission from Y dwarfs [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 Abstract As a pilot study of magnetism in Y dwarfs, we have observed the three known infrared variable Y dwarfs WISE J085510.83−071442.5, WISE J140518.40+553421.4, and WISEP J173835.53+273258.9 with the NSF’s Karl G. Jansky Very Large Array in the 4–8 GHz frequency range.
Kao, Melodie M. +2 more
openaire +2 more sources
Structure and evolution of ultra-massive white dwarfs in general relativity [PDF]
, 2022 Context. Ultra-massive white dwarfs (M⋆ ≳ 1.05 M⊙) are of utmost importance in view of the role they play in type Ia supernovae explosions, merger events, the existence of high-magnetic -field white dwarfs, and the physical processes in the super ...
Santiago Torres +27 more
core +1 more source
Can we reveal the core-chemical composition of ultra-massive white dwarfs through their magnetic fields? [PDF]
, 2022 Ultra-massive white dwarfs (1.05M⊙≲MWD) are particularly interesting objects that allow us to study extreme astrophysical phenomena such as type Ia supernovae explosions and merger events.
Santiago Torres +20 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. +48 more
core +3 more sources