Results 41 to 50 of about 22,040,331 (192)

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, Faherty, J, Kirkpatrick, JD, Wright, EL, Gelino, CR, Cushing, MC, Griffith, RL, Salter, G   +7 more
openaire   +3 more sources

Atmospheric Modeling of Brown Dwarfs [PDF]

, 2023
Brown dwarfs are celestial bodies outside the solar system that are more massive than planets, but less massive than stars. Since they are less massive than stars, they do not fuse hydrogen in their core, but rather cool slowly over time.
Roberts, Brayden, Lothringer, Joshua
core   +1 more source

DA white dwarfs in Sloan Digital Sky Survey Data Release 7 and a search for infrared excess emission [PDF]

, 2011
We present a method which uses colour–colour cuts on the Sloan Digital Sky Survey (SDSS) photometry to select white dwarfs with hydrogen-rich (DA) atmospheres without the recourse to spectroscopy.
Farihi, J., Breedt, E, J. Girven, Koester, Detlev, Gänsicke, B. T., Gänsicke, BT, Farihi, J, Koester, D, Steeghs, D., Gaensicke, B. T., Koester, D., Girven, Jonathan, Breedt, E., D. Koester, Parsons, S. G., D. Steeghs, Parsons, SG, Girven, J., B. T. Gänsicke, Girven, J   +19 more
core   +1 more source

Forever young white dwarfs: When stellar ageing stops [PDF]

, 2021
White dwarf stars are the most common end point of stellar evolution. The ultramassive white dwarfs are of special interest as they are related to type Ia supernovae explosions, merger events, and fast radio bursts. Ultramassive white dwarfs are expected
Santiago Torres, Roberto Raddi, Rebassa Mansergas, Alberto, Cheng, Sihao, Alejandro H. Córsico, Pier-Emmanuel Tremblay, Althaus, Leandro Gabriel, María E. Camisassa, Tremblay, P. E., Torres Gil, Santiago, Sihao Cheng, Corsico, Alejandro Hugo, Althaus, Leandro G., Tremblay, Pier Emmanuel, Raddi, Roberto, Leandro G. Althaus, Camisassa, María E., Torres, Santiago, Córsico, Alejandro H., Tremblay, Pier-Emmanuel, Rebassa-Mansergas, Alberto, Alberto Rebassa-Mansergas, Camisassa, María Eugenia, Rebassa-Mansergas, A., Raddi, R.   +24 more
core   +1 more source

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, Marley, Mark S, Fortney, Jonathan J, Lupu, Roxana   +3 more
openaire   +4 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.
Emily C. Martin, J. Davy Kirkpatrick, Charles A. Beichman, Richard L. Smart, Jacqueline K. Faherty, Christopher R. Gelino, Michael C. Cushing, Adam C. Schneider, Edward L. Wright, Patrick Lowrance, James Ingalls, C. G. Tinney, Ian S. McLean, Sarah E. Logsdon, Jérémy Lebreton   +14 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., Hallinan, Gregg, Pineda, J. Sebastian   +2 more
openaire   +2 more sources

Searching for binary Y dwarfs with the Gemini Multi-Conjugate Adaptive Optics System (GeMS) [PDF]

, 2014
The NASA Wide-field Infrared Survey Explorer (WISE) has delivered an exceptional harvest of new ultra-cool Y-type brown dwarfs. We present results from a diffraction-limited study of the binary status of a sample of Y dwarfs observed with the Gemini GeMS
Tinney, Chris, Opitz, Daniela (5302756), Tinney, Chris (5302759), Opitz, Daniela   +3 more
core   +1 more source

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, Adam C. Schneider, J. Davy Kirkpatrick, Caroline V. Morley, Mark S. Marley, Christopher R. Gelino, Gregory N. Mace, Edward L. Wright, Peter R. Eisenhardt, Michael F. Skrutskie, Kenneth A. Marsh   +10 more
openaire   +3 more sources