# Y Dwarf Trigonometric Parallaxes from the Spitzer Space Telescope

@article{Martin2018YDT,
title={Y Dwarf Trigonometric Parallaxes from the Spitzer Space Telescope},
author={Emily C. Martin and J. Davy Kirkpatrick and Charles A. Beichman and R. L. Smart and Jacqueline K. Faherty and Christopher Ryan Gelino and Michael C. Cushing and Adam C. Schneider and Edward L. Wright and Patrick J. Lowrance and James G. Ingalls and C. G. Tinney and Ian S. McLean and Sarah E. Logsdon and J{\'e}r{\'e}my Lebreton},
journal={The Astrophysical Journal},
year={2018},
volume={867},
pages={109}
}
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 towards characterizing their absolute physical properties. Using Spitzer/IRAC [4.5] images taken over baselines of $\sim$2-7 years, we measure astrometric distances for 22 late-T and early Y dwarfs, including updated parallaxes for 18 objects and new parallax… Expand

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#### References

SHOWING 1-10 OF 61 REFERENCES
WISE Y DWARFS AS PROBES OF THE BROWN DWARF-EXOPLANET CONNECTION
We have determined astrometric positions for 15 WISE-discovered late-type brown dwarfs (six T8-9 and nine Y dwarfs) using the Keck-II telescope, the Spitzer Space Telescope, and the Hubble SpaceExpand
Population Properties of Brown Dwarf Analogs to Exoplanets
We present a kinematic analysis of 152 low surface gravity M7-L8 dwarfs by adding 8 parallaxes, 38 radial velocities, and 19 proper motions. We find 39 objects to be high-likelihood or bona fideExpand
The Y-Type Brown Dwarfs: Estimates of Mass and Age from New Astrometry, Homogenized Photometry and Near-Infrared Spectroscopy
• Physics
• 2017
The survey of the mid-infrared sky by the Wide-field Infrared Survey Explorer (WISE) led to the discovery of extremely cold low-mass brown dwarfs, classified as Y dwarfs, which extend the T class toExpand
DISCOVERY OF A ∼250 K BROWN DWARF AT 2 pc FROM THE SUN*
Through a previous analysis of multi-epoch astrometry from the Wide-field Infrared Survey Explorer (WISE), I identified WISE J085510.83–071442.5 as a new high proper motion object. By combiningExpand
Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects
• Physics, Medicine
• Science
• 2013
A large sample of precise distances based on homogeneous mid-infrared astrometry that robustly establishes absolute fluxes, luminosities, and temperatures is presented, showing the coolest brown dwarfs have temperatures of 400 to 450 kelvin and masses almost equal to 5 to 20 times that of Jupiter. Expand
Beyond the t dwarfs: theoretical spectra, colors, and detectability of the coolest brown dwarfs
• Physics
• 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 fromExpand
Near-infrared Photometry of Y Dwarfs: Low Ammonia Abundance and the Onset of Water Clouds
• Physics
• 2014
We present new near-infrared photometry for seven late-type T dwarfs and nine Y-type dwarfs, and lower limit magnitudes for a tenth Y dwarf, obtained at Gemini Observatory. We also present aExpand
Parallaxes and Infrared Photometry of three Y0 dwarfs
We have followed up the three Y0 dwarfs WISEPA J041022.71+150248.5, WISEPA J173835.53+273258.9 and WISEPC J205628.90+145953.3 using the United Kingdom Infrared Telescope Wide Field Camera. We findExpand
THE SOLAR NEIGHBORHOOD. XXXVIII. RESULTS FROM THE CTIO/SMARTS 0.9 m: TRIGONOMETRIC PARALLAXES FOR 151 NEARBY M DWARF SYSTEMS
We present 160 new trigonometric parallaxes for 151 M dwarf systems from the REsearch Consortium On Nearby Stars (RECONS) group's long-term astrometry/photometry program at the CTIO/SMARTS 0.9 mExpand
The Luminosities of the Coldest Brown Dwarfs
• Physics
• 2014
In recent years brown dwarfs have been extended to a new Y-dwarf class with effective temperatures colder than 500K and masses in the range 5-30 Jupiter masses. They fill a crucial gap in observableExpand