Discovery of the benchmark metal poor T8 dwarf BD+01 2920B

D.J. Pinfield; B. Burningham; N. Lodieu; S. Leggett; C.G. Tinney; L. van Spaandonk; F. Marocco; R. Smart; J. Gomes; Leigh Smith; P.W. Lucas; A.  Day-jones; D.  Murray; A. C.  Katsiyannis; S. Catalan; C. Cardoso; James  Clarke; S. Folkes; M.  Galvez-Ortiz; D. Homeier; J.  Jenkins; H.R.A.  Jones; Z.  Zhang

doi:10.1111/j.1365-2966.2012.20549.x

Discovery of the benchmark metal poor T8 dwarf BD+01 2920B

D.J. Pinfield, B. Burningham, N. Lodieu, S. Leggett, C.G. Tinney, L. van Spaandonk, F. Marocco, R. Smart, J. Gomes, Leigh Smith, P.W. Lucas, A. Day-jones, D. Murray, A. C. Katsiyannis, S. Catalan, C. Cardoso, James Clarke, S. Folkes, M. Galvez-Ortiz, D. HomeierJ. Jenkins, H.R.A. Jones, Z. Zhang

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Abstract

We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (<=10,000AU) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band suppressed T8p dwarf WISEP J142320.86+011638.1 and the mildly metal poor ([Fe/H]=-0.38+-0.06) primary BD+01 2920 (HIP 70319), a G1 dwarf at a distance of 17.2pc. This new benchmark has Teff=680+-55K and a mass of 20-50MJup. Its spectral properties are well modelled except for known discrepancies in the Y and K bands. Based on the well determined metallicity of its companion, the properties of BD+01 2920B imply that the currently known T dwarfs are dominated by young low-mass objects. We also present an accurate proper motion for the T8.5 dwarf WISEP J07003.84+272544.8

Original language	English
Pages (from-to)	1922-1932
Journal	Monthly Notices of the Royal Astronomical Society (MNRAS)
Volume	422
Issue number	3
Early online date	13 Apr 2012
DOIs	https://doi.org/10.1111/j.1365-2966.2012.20549.x
Publication status	Published - 2012

Keywords

astro-ph.SR

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Pinfield, D. J., Burningham, B., Lodieu, N., Leggett, S., Tinney, C. G., van Spaandonk, L., Marocco, F., Smart, R., Gomes, J., Smith, L., Lucas, P. W., Day-jones, A., Murray, D., Katsiyannis, A. C., Catalan, S., Cardoso, C., Clarke, J., Folkes, S., Galvez-Ortiz, M., ... Zhang, Z. (2012). Discovery of the benchmark metal poor T8 dwarf BD+01 2920B. Monthly Notices of the Royal Astronomical Society (MNRAS), 422(3), 1922-1932. https://doi.org/10.1111/j.1365-2966.2012.20549.x

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title = "Discovery of the benchmark metal poor T8 dwarf BD+01 2920B",

abstract = "We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (<=10,000AU) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band suppressed T8p dwarf WISEP J142320.86+011638.1 and the mildly metal poor ([Fe/H]=-0.38+-0.06) primary BD+01 2920 (HIP 70319), a G1 dwarf at a distance of 17.2pc. This new benchmark has Teff=680+-55K and a mass of 20-50MJup. Its spectral properties are well modelled except for known discrepancies in the Y and K bands. Based on the well determined metallicity of its companion, the properties of BD+01 2920B imply that the currently known T dwarfs are dominated by young low-mass objects. We also present an accurate proper motion for the T8.5 dwarf WISEP J07003.84+272544.8",

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author = "D.J. Pinfield and B. Burningham and N. Lodieu and S. Leggett and C.G. Tinney and {van Spaandonk}, L. and F. Marocco and R. Smart and J. Gomes and Leigh Smith and P.W. Lucas and A. Day-jones and D. Murray and Katsiyannis, {A. C.} and S. Catalan and C. Cardoso and James Clarke and S. Folkes and M. Galvez-Ortiz and D. Homeier and J. Jenkins and H.R.A. Jones and Z. Zhang",

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Pinfield, DJ , Burningham, B, Lodieu, N, Leggett, S, Tinney, CG, van Spaandonk, L, Marocco, F, Smart, R, Gomes, J, Smith, L, Lucas, PW, Day-jones, A, Murray, D, Katsiyannis, AC, Catalan, S, Cardoso, C, Clarke, J, Folkes, S, Galvez-Ortiz, M, Homeier, D, Jenkins, J, Jones, HRA & Zhang, Z 2012, 'Discovery of the benchmark metal poor T8 dwarf BD+01 2920B', Monthly Notices of the Royal Astronomical Society (MNRAS), vol. 422, no. 3, pp. 1922-1932. https://doi.org/10.1111/j.1365-2966.2012.20549.x

TY - JOUR

T1 - Discovery of the benchmark metal poor T8 dwarf BD+01 2920B

AU - Pinfield, D.J.

AU - Burningham, B.

AU - Lodieu, N.

AU - Leggett, S.

AU - Tinney, C.G.

AU - van Spaandonk, L.

AU - Marocco, F.

AU - Smart, R.

AU - Gomes, J.

AU - Smith, Leigh

AU - Lucas, P.W.

AU - Day-jones, A.

AU - Murray, D.

AU - Katsiyannis, A. C.

AU - Catalan, S.

AU - Cardoso, C.

AU - Clarke, James

AU - Folkes, S.

AU - Galvez-Ortiz, M.

AU - Homeier, D.

AU - Jenkins, J.

AU - Jones, H.R.A.

AU - Zhang, Z.

PY - 2012

Y1 - 2012

N2 - We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (<=10,000AU) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band suppressed T8p dwarf WISEP J142320.86+011638.1 and the mildly metal poor ([Fe/H]=-0.38+-0.06) primary BD+01 2920 (HIP 70319), a G1 dwarf at a distance of 17.2pc. This new benchmark has Teff=680+-55K and a mass of 20-50MJup. Its spectral properties are well modelled except for known discrepancies in the Y and K bands. Based on the well determined metallicity of its companion, the properties of BD+01 2920B imply that the currently known T dwarfs are dominated by young low-mass objects. We also present an accurate proper motion for the T8.5 dwarf WISEP J07003.84+272544.8

AB - We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (<=10,000AU) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band suppressed T8p dwarf WISEP J142320.86+011638.1 and the mildly metal poor ([Fe/H]=-0.38+-0.06) primary BD+01 2920 (HIP 70319), a G1 dwarf at a distance of 17.2pc. This new benchmark has Teff=680+-55K and a mass of 20-50MJup. Its spectral properties are well modelled except for known discrepancies in the Y and K bands. Based on the well determined metallicity of its companion, the properties of BD+01 2920B imply that the currently known T dwarfs are dominated by young low-mass objects. We also present an accurate proper motion for the T8.5 dwarf WISEP J07003.84+272544.8

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U2 - 10.1111/j.1365-2966.2012.20549.x

DO - 10.1111/j.1365-2966.2012.20549.x

M3 - Article

SN - 0035-8711

VL - 422

SP - 1922

EP - 1932

JO - Monthly Notices of the Royal Astronomical Society (MNRAS)

JF - Monthly Notices of the Royal Astronomical Society (MNRAS)

IS - 3

ER -

Discovery of the benchmark metal poor T8 dwarf BD+01 2920B

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