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Title: Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs

Abstract

ABSTRACT We presented 15 new T dwarfs that were selected from UKIRT Infrared Deep Sky Survey, Visible and Infrared Survey Telescope for Astronomy , and Wide-field Infrared Survey Explorer surveys, and confirmed with optical to near-infrared spectra obtained with the Very Large Telescope and the Gran Telescopio Canarias. One of these new T dwarfs is mildly metal-poor with slightly suppressed K-band flux. We presented a new X-shooter spectrum of a known benchmark sdT5.5 subdwarf, HIP 73786B. To better understand observational properties of brown dwarfs, we discussed transition zones (mass ranges) with low-rate hydrogen, lithium, and deuterium burning in brown dwarf population. The hydrogen burning transition zone is also the substellar transition zone that separates very low-mass stars, transitional, and degenerate brown dwarfs. Transitional brown dwarfs have been discussed in previous works of the Primeval series. Degenerate brown dwarfs without hydrogen fusion are the majority of brown dwarfs. Metal-poor degenerate brown dwarfs of the Galactic thick disc and halo have become T5+ subdwarfs. We selected 41 T5+ subdwarfs from the literature by their suppressed K-band flux. We studied the spectral-type–colour correlations, spectral-type–absolute magnitude correlations, colour–colour plots, and HR diagrams of T5+ subdwarfs, in comparison to these of L–T dwarfs and L subdwarfs.more » We discussed the T5+ subdwarf discovery capability of deep sky surveys in the 2020s.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [3];  [5];  [6]
  1. (张曾华), Z. H. [GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, F-92190 Meudon, France
  2. Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093, USA
  3. Centro de Astrobiología (CSIC-INTA), Ctra. Ajalvir km 4, E-28850 Torrejón de Ardoz, Madrid, Spain
  4. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dept. Astrofísica, E-38206 La Laguna, Tenerife, Spain
  5. School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
  6. Univ Lyon, ENS de Lyon, Univ Lyon 1, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574, F-69007 Lyon, France
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1507207
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 486 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Zhang, Burgasser, A. J., Gálvez-Ortiz, M. C., Lodieu, N., Zapatero Osorio, M. R., Pinfield, D. J., and Allard, F. Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz777.
Zhang, Burgasser, A. J., Gálvez-Ortiz, M. C., Lodieu, N., Zapatero Osorio, M. R., Pinfield, D. J., & Allard, F. Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs. United Kingdom. doi:10.1093/mnras/stz777.
Zhang, Burgasser, A. J., Gálvez-Ortiz, M. C., Lodieu, N., Zapatero Osorio, M. R., Pinfield, D. J., and Allard, F. Thu . "Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs". United Kingdom. doi:10.1093/mnras/stz777.
@article{osti_1507207,
title = {Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs},
author = {Zhang and Burgasser, A. J. and Gálvez-Ortiz, M. C. and Lodieu, N. and Zapatero Osorio, M. R. and Pinfield, D. J. and Allard, F.},
abstractNote = {ABSTRACT We presented 15 new T dwarfs that were selected from UKIRT Infrared Deep Sky Survey, Visible and Infrared Survey Telescope for Astronomy , and Wide-field Infrared Survey Explorer surveys, and confirmed with optical to near-infrared spectra obtained with the Very Large Telescope and the Gran Telescopio Canarias. One of these new T dwarfs is mildly metal-poor with slightly suppressed K-band flux. We presented a new X-shooter spectrum of a known benchmark sdT5.5 subdwarf, HIP 73786B. To better understand observational properties of brown dwarfs, we discussed transition zones (mass ranges) with low-rate hydrogen, lithium, and deuterium burning in brown dwarf population. The hydrogen burning transition zone is also the substellar transition zone that separates very low-mass stars, transitional, and degenerate brown dwarfs. Transitional brown dwarfs have been discussed in previous works of the Primeval series. Degenerate brown dwarfs without hydrogen fusion are the majority of brown dwarfs. Metal-poor degenerate brown dwarfs of the Galactic thick disc and halo have become T5+ subdwarfs. We selected 41 T5+ subdwarfs from the literature by their suppressed K-band flux. We studied the spectral-type–colour correlations, spectral-type–absolute magnitude correlations, colour–colour plots, and HR diagrams of T5+ subdwarfs, in comparison to these of L–T dwarfs and L subdwarfs. We discussed the T5+ subdwarf discovery capability of deep sky surveys in the 2020s.},
doi = {10.1093/mnras/stz777},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 486,
place = {United Kingdom},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1093/mnras/stz777

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  • The Astrophysical Journal, Vol. 491, Issue 2
  • DOI: 10.1086/305002

Further Defining Spectral type “y” and Exploring the Low-Mass end of the Field Brown Dwarf mass Function
journal, June 2012

  • Davy Kirkpatrick, J.; Gelino, Christopher R.; Cushing, Michael C.
  • The Astrophysical Journal, Vol. 753, Issue 2
  • DOI: 10.1088/0004-637X/753/2/156

Kelu-1 : A Free-floating Brown Dwarf in the Solar Neighborhood
journal, December 1997

  • Ruiz, Maria Teresa; Leggett, S. K.; Allard, France
  • The Astrophysical Journal, Vol. 491, Issue 2
  • DOI: 10.1086/311070

Brown Dwarfs in Young Moving Groups from Pan-Starrs1. i. ab Doradus
journal, April 2016

  • Aller, Kimberly M.; Liu, Michael C.; Magnier, Eugene A.
  • The Astrophysical Journal, Vol. 821, Issue 2
  • DOI: 10.3847/0004-637X/821/2/120

Primeval very low-mass stars and brown dwarfs – III. The halo transitional brown dwarfs
journal, May 2018

  • Zhang (张曾华), Z. H.; Pinfield, D. J.; Gálvez-Ortiz, M. C.
  • Monthly Notices of the Royal Astronomical Society, Vol. 479, Issue 1
  • DOI: 10.1093/mnras/sty1352

Alkali Element Chemistry in Cool Dwarf Atmospheres
journal, July 1999

  • Lodders, Katharina
  • The Astrophysical Journal, Vol. 519, Issue 2
  • DOI: 10.1086/307387

Brown Dwarfs in the Pleiades Cluster Confirmed by the Lithium Test
journal, September 1996

  • Rebolo, R.; Martín, E. L.; Basri, G.
  • The Astrophysical Journal, Vol. 469, Issue 1
  • DOI: 10.1086/310263

The Missing Link: Early Methane (“T”) Dwarfs in the Sloan Digital Sky Survey
journal, June 2000

  • Leggett, S. K.; Geballe, T. R.; Fan, Xiaohui
  • The Astrophysical Journal, Vol. 536, Issue 1
  • DOI: 10.1086/312728

The Wide-Field Infrared Survey Explorer (Wise): Mission Description and Initial On-Orbit Performance
journal, November 2010


A Unified Near‐Infrared Spectral Classification Scheme for T Dwarfs
journal, February 2006

  • Burgasser, Adam J.; Geballe, T. R.; Leggett, S. K.
  • The Astrophysical Journal, Vol. 637, Issue 2
  • DOI: 10.1086/498563

The Dependence of Brown Dwarf Radii on Atmospheric Metallicity and Clouds: Theory and Comparison with Observations
journal, July 2011


An Improved Optical Spectrum and New Model Fits of the Likely Brown Dwarf GD 165B
journal, July 1999

  • Kirkpatrick, J. Davy; Allard, France; Bida, Tom
  • The Astrophysical Journal, Vol. 519, Issue 2
  • DOI: 10.1086/307380

Blue not brown: UKIRT Infrared Deep Sky Survey T dwarfs with suppressed K-band flux: UKIDSS T dwarfs with depressed K-bands
journal, March 2011


New Spectral Types L and T
journal, September 2005