Primeval very low-mass stars and brown dwarfs: III. The halo transitional brown dwarfs
We report the discovery of an esdL3 subdwarf, ULAS J020858.62+020657.0, and a usdL4.5 subdwarf, ULAS J230711.01+014447.1. They were identified as L subdwarfs by optical spectra obtained with the Gran Telescopio Canarias, and followed up by optical-to-near-infrared spectroscopy with the Very Large Te...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
21 Jun 2018
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| In: |
Arxiv
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| Online-Zugang: | Verlag, Volltext: http://arxiv.org/abs/1805.08033
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| Verfasserangaben: | Z.H. Zhang, D.J. Pinfield, M.C. Galvez-Ortiz, D. Homeier, A. J. Burgasser, N. Lodieu, E. L. Martin, M.R. Zapatero Osorio, F. Allard, H.R.A. Jones, R.L. Smart, B. Lopez Marti, B. Burningham and R. Rebolo |
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| 245 | 1 | 0 | |a Primeval very low-mass stars and brown dwarfs |b III. The halo transitional brown dwarfs |c Z.H. Zhang, D.J. Pinfield, M.C. Galvez-Ortiz, D. Homeier, A. J. Burgasser, N. Lodieu, E. L. Martin, M.R. Zapatero Osorio, F. Allard, H.R.A. Jones, R.L. Smart, B. Lopez Marti, B. Burningham and R. Rebolo |
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| 520 | |a We report the discovery of an esdL3 subdwarf, ULAS J020858.62+020657.0, and a usdL4.5 subdwarf, ULAS J230711.01+014447.1. They were identified as L subdwarfs by optical spectra obtained with the Gran Telescopio Canarias, and followed up by optical-to-near-infrared spectroscopy with the Very Large Telescope. We also obtained an optical-to-near-infrared spectrum of a previously known L subdwarf, ULAS J135058.85+081506.8, and reclassified it as a usdL3 subdwarf. These three objects all have typical halo kinematics. They have $T_{\rm eff}$ around 2050$-$2250 K, $-$1.8 $\leq$ [Fe/H] $\leq -$1.5, and mass around 0.0822$-$0.0833 M$_{\odot}$, according to model spectral fitting and evolutionary models. These sources are likely halo transitional brown dwarfs with unsteady hydrogen fusion, as their masses are just below the hydrogen-burning minimum mass, which is $\sim$ 0.0845 M$_{\odot}$ at [Fe/H] = $-$1.6 and $\sim$ 0.0855 M$_{\odot}$ at [Fe/H] = $-$1.8. Including these, there are now nine objects in the `halo brown dwarf transition zone', which is a `substellar subdwarf gap' that spans a wide temperature range within a narrow mass range of the substellar population. | ||
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