Primeval very low-mass stars and brown dwarfs: II. the most metal-poor substellar object
SDSS J010448.46+153501.8 has previously been classified as an sdM9.5 subdwarf. However, its very blue J − K colour (-0.15 ± 0.17) suggests a much lower metallicity compared to normal sdM9.5 subdwarfs. Here, we re-classify this object as a usdL1.5 subdwarf based on a new optical and near-infrared spe...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
22 February 2017
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2017, Jahrgang: 468, Heft: 1, Pages: 261-271 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stx350 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1093/mnras/stx350
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| Verfasserangaben: | Z.H. Zhang (张曾华), D. Homeier, D.J. Pinfield, N. Lodieu, H.R.A. Jones, F. Allard, and Ya. V. Pavlenko |
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| 245 | 1 | 0 | |a Primeval very low-mass stars and brown dwarfs |b II. the most metal-poor substellar object |c Z.H. Zhang (张曾华), D. Homeier, D.J. Pinfield, N. Lodieu, H.R.A. Jones, F. Allard, and Ya. V. Pavlenko |
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| 520 | |a SDSS J010448.46+153501.8 has previously been classified as an sdM9.5 subdwarf. However, its very blue J − K colour (-0.15 ± 0.17) suggests a much lower metallicity compared to normal sdM9.5 subdwarfs. Here, we re-classify this object as a usdL1.5 subdwarf based on a new optical and near-infrared spectrum obtained with X-shooter on the Very Large Telescope. Spectral fitting with BT-Settl models leads to Teff = 2450 ± 150 K, [Fe/H] = -2.4 ± 0.2 and log g = 5.5 ± 0.25. We estimate a mass for SDSS J010448.46+153501.8 of 0.086 ± 0.0015 M⊙ which is just below the hydrogen-burning minimum mass at [Fe/H] = -2.4 (∼0.088 M⊙) according to evolutionary models. Our analysis thus shows SDSS J010448.46+153501.8 to be the most metal-poor and highest mass substellar object known to-date. We found that SDSS J010448.46+153501.8 is joined by another five known L subdwarfs (2MASS J05325346+8246465, 2MASS J06164006−6407194, SDSS J125637.16−022452.2, ULAS J151913.03−000030.0 and 2MASS J16262034+3925190) in a ‘halo brown dwarf transition zone’ in the Teff-[Fe/H] plane, which represents a narrow mass range in which unsteady nuclear fusion occurs. This halo brown dwarf transition zone forms a ‘substellar subdwarf gap’ for mid L to early T types. | ||
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