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 »
- Authors:
-
[1];
[2];
- (张曾华), Z. H. [GEPI, Observatoire de Paris, Université PSL, CNRS, 5 Place Jules Janssen, F-92190 Meudon, France
- Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093, USA
- Centro de Astrobiología (CSIC-INTA), Ctra. Ajalvir km 4, E-28850 Torrejón de Ardoz, Madrid, Spain
- Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain, Universidad de La Laguna, Dept. Astrofísica, E-38206 La Laguna, Tenerife, Spain
- School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
- 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. https://doi.org/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. https://doi.org/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 = {Thu Mar 14 00:00:00 EDT 2019},
month = {Thu Mar 14 00:00:00 EDT 2019}
}
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