Parallaxes and Infrared Photometry of three Y0 dwarfs

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

doi:10.1093/mnras/stx723

Parallaxes and Infrared Photometry of three Y0 dwarfs

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

Centre for Astrophysics Research (CAR)

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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.

Original language	English
Pages (from-to)	3764-3774
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Early online date	24 Mar 2017
DOIs	https://doi.org/10.1093/mnras/stx723
Publication status	E-pub ahead of print - 24 Mar 2017

Keywords

astro-ph.SR

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@article{e7a87da92c634993bf01a0da979865b5,

title = "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.",

keywords = "astro-ph.SR",

author = "Smart, {R. L.} and D{\'a}niel Apai and Kirkpatrick, {J. Davy} and S.K. Leggett and F. Marocco and Morrison, {Jane E.} and Jones, {H. R. A.} and D. Pinfield and P. Tremblin and Amundsen, {D. S.}",

note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. {\textcopyright} 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",

year = "2017",

month = mar,

day = "24",

doi = "10.1093/mnras/stx723",

language = "English",

pages = "3764--3774",

journal = "Monthly Notices of the Royal Astronomical Society",

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publisher = "Oxford University Press (OUP)",

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TY - JOUR

T1 - Parallaxes and Infrared Photometry of three Y0 dwarfs

AU - Smart, R. L.

AU - Apai, Dániel

AU - Kirkpatrick, J. Davy

AU - Leggett, S.K.

AU - Marocco, F.

AU - Morrison, Jane E.

AU - Jones, H. R. A.

AU - Pinfield, D.

AU - Tremblin, P.

AU - Amundsen, D. S.

N1 - 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.

PY - 2017/3/24

Y1 - 2017/3/24

N2 - 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.

AB - 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.

KW - astro-ph.SR

U2 - 10.1093/mnras/stx723

DO - 10.1093/mnras/stx723

M3 - Article

SN - 0035-8711

SP - 3764

EP - 3774

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

ER -

Parallaxes and Infrared Photometry of three Y0 dwarfs

Abstract

Keywords

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