University of Hertfordshire

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From the same journal

By the same authors

Parallaxes and Infrared Photometry of three Y0 dwarfs

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  • R. L. Smart
  • Dániel Apai
  • J. Davy Kirkpatrick
  • S.K. Leggett
  • F. Marocco
  • Jane E. Morrison
  • H. R. A. Jones
  • D. Pinfield
  • P. Tremblin
  • D. S. Amundsen
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Original languageEnglish
Pages (from-to)3764-3774
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Early online date24 Mar 2017
Publication statusE-pub ahead of print - 24 Mar 2017


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.


This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

ID: 11844993