Searching for Binary Y dwarfs with the Gemini Multi-Conjugate Adaptive Optics System (GeMS)
arXiv:1601.05508 · doi:10.3847/0004-637X/819/1/17
Abstract
The NASA Wide-field Infrared Survey Explorer (WISE) has discovered almost all the known members of the new class of Y-type brown dwarfs. Most of these Y dwarfs have been identified as isolated objects in the field. It is known that binaries with L- and T-type brown dwarf primaries are less prevalent than either M-dwarf or solar-type primaries, they tend to have smaller separations and are more frequently detected in near-equal mass configurations. The binary statistics for Y-type brown dwarfs, however, are sparse, and so it is unclear if the same trends that hold for L- and T-type brown dwarfs also hold for Y-type ones. In addition, the detection of binary companions to very cool Y dwarfs may well be the best means available for discovering even colder objects. We present results for binary properties of a sample of five WISE Y dwarfs with the Gemini Multi-Conjugate Adaptive Optics System (GeMS). We find no evidence for binary companions in these data, which suggests these systems are not equal-luminosity (or equal-mass) binaries with separations larger than ~ 0.5-1.9 AU. For equal-mass binaries at an age of 5 Gyr, we find that the binary binding energies ruled out by our observations (i.e. 10^42 erg) are consistent with those observed in previous studies of hotter ultra-cool dwarfs.
arXiv commentAccepted for publication in the Astrophysical Journal
References in corpus (36)
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- Stellar Multiplicity
- Neglected Clouds in T and Y Dwarf Atmospheres
- Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
- The Discovery of Y Dwarfs Using Data from the Wide-field Infrared Survey Explorer (WISE)
- Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function
- Detection of Nine M8.0-L0.5 Binaries: The Very Low Mass Binary Population and its Implications for Brown Dwarf and VLM Star Formation
- HST Spectral Mapping of L/T Transition Brown Dwarfs Reveals Cloud Thickness Variations
- Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects
- A search for L dwarf binary systems
- Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
- Discovery of a Candidate for the Coolest Known Brown Dwarf
- Dynamical Mass of the Substellar Benchmark Binary HD 130948BC
- High Precision Dynamical Masses of Very Low Mass Binaries
- Vertical Atmospheric Structure in a Variable Brown Dwarf: Pressure-dependent Phase Shifts in Simultaneous Hubble Space Telescope-Spitzer Light Curves
- The Wide Brown Dwarf Binary Oph 1622-2405 and Discovery of A Wide, Low Mass Binary in Ophiuchus (Oph 1623-2402): A New Class of Young Evaporating Wide Binaries?
- Sloan Low-Mass Wide Pairs of Kinematically Equivalent Stars (SLoWPoKES): A Catalog of Very Wide, Low-mass Pairs
- Hubble Space Telescope Spectroscopy of Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer
- Keck Imaging of Binary L Dwarfs
- Two Extraordinary Substellar Binaries at the T/Y Transition and the Y-Band Fluxes of the Coolest Brown Dwarfs
- Near-infrared photometry of Y dwarfs: low ammonia abundance and the onset of water clouds
- WISE Brown Dwarf Binaries: The Discovery of a T5+T5 and a T8.5+T9 System
- CFBDSIR J1458+1013B: A Very Cold (>T10) Brown Dwarf in a Binary System
- The Luminosities of the Coldest Brown Dwarfs
- Cloud structure of the nearest brown dwarfs: Spectroscopic variability of Luhman 16AB from the Hubble Space Telescope
- WISE J163940.83-684738.6: A Y Dwarf identified by Methane Imaging
- Three New Cool Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer (WISE) and an Improved Spectrum of the Y0 Dwarf WISE J041022.71+150248.4
- Discovery of the Y1 Dwarf WISE J064723.23-623235.5
- Indications of Water Clouds in the Coldest Known Brown Dwarf
- HST, VLT, and NTT imaging search for wide companions to bona-fide and candidate brown dwarfs in the Cha I dark cloud
- Discovery of a Low-Luminosity, Tight Substellar Binary at the T/Y Transition
- Identification of a Wide, Low-Mass Multiple System Containing the Brown Dwarf 2MASS J0850359+105716
- A Search for Companions to Brown Dwarfs in the Taurus and Chamaeleon Star Forming Regions
- A Hubble Space Telescope ACS Search for Brown Dwarf Binaries in the Pleiades Open Cluster
- Discovery of a new Y dwarf: WISE J030449.03-270508.3
- Constraints on the binary Properties of mid to late T dwarfs from Hubble Space Telescope WFC3 Observations
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- The Field Substellar Mass Function Based on the Full-sky 20-pc Census of 525 L, T, and Y Dwarfs
- Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime
- The Y-Type Brown Dwarfs: Estimates of Mass and Age from New Astrometry, Homogenized Photometry and Near-Infrared Spectroscopy
- Constraining the multiplicity statistics of the coolest brown dwarfs: binary fraction continues to decrease with spectral type
- A Uniform Retrieval Analysis of Ultracool Dwarfs. III. Properties of Y-Dwarfs
- Extending Gaia DR2 with HST narrow-field astrometry: the WISE J154151.65-225024.9 test case
- JWST Observations of the Enigmatic Y Dwarf WISE 1828+2650: I. Limits to a Binary Companion
- Substellar and low-mass dwarf identification with near-infrared imaging space observatories
- Extending Gaia DR2 with HST narrow-field astrometry. II. Refining the method on WISE J163940.83-684738.6
- CWISE J014611.20-050850.0AB: The Widest Known Brown Dwarf Binary in the Field
- Detection of the Binarity of the Star J1158+4239
- Stellar photometry with Multi Conjugate Adaptive Optics
- Mysteries of Capotauro: investigating the puzzling nature of an extreme F356W-dropout
- Enhanced thermal radiation from a tidally heated exomoon with a single hot spot