Parallaxes and Infrared Photometry of three Y0 dwarfs

Abstract

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 UKIRT/WFCAM telescope/instruments. We find parallaxes that are more consistent and accurate than previously published values. We estimate absolute magnitudes in photometric pass-bands from $Y$ to $W3$ and find them to be consistent between the three Y0 dwarfs indicating the inherent cosmic absolute magnitude spread of these objects is small. We examine the MKO $J$ magnitudes over the four year time line and find small but significant monotonic variations. Finally we estimate physical parameters from a comparison of spectra and parallax to equilibrium and non-equilibrium models finding values consistent with solar metallicity, an effective temperature of 450-475\,K and log~g of 4.0-4.5.

12 Pages, 10 figures, Accepted by MNRAS

References in corpus (12)

• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
• Fingering convection and cloudless models for cool brown dwarf atmospheres
• The UKIRT Infrared Deep Sky Survey Early Data Release
• Water Clouds in Y Dwarfs and Exoplanets
• Hubble Space Telescope Spectroscopy of Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer
• $ExtrasolarStorms$: Pressure-dependent Changes In Light Curve Phase In Brown Dwarfs From Simultaneous $Hubble$ and $Spitzer$ Observations
• Near-infrared photometry of Y dwarfs: low ammonia abundance and the onset of water clouds
• The Luminosities of the Coldest Brown Dwarfs
• Saturn's Great Storm of 2010-2011: Evidence for ammonia and water ices from analysis of VIMS spectra
• Observed Variability at 1um and 4um in the Y0 Brown Dwarf WISEP J173835.52+273258.9
• Photometric Monitoring of the Coldest Known Brown Dwarf with the Spitzer Space Telescope

Cited by in corpus (7)

• 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 Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT
• A Uniform Retrieval Analysis of Ultracool Dwarfs. III. Properties of Y-Dwarfs
• A 3D view of the Hyades stellar and sub-stellar population
• Y dwarf Trigonometric Parallaxes from the Spitzer Space Telescope
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• Parallaxes of Cool Objects with WISE: Filling in for Gaia