$K_s$-band photometry of the Extreme T Subdwarf CWISE J221706.28$-$145437.6
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912472708939776 |
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| author | Zhang, Jerry Jun-Yan Lodieu, Nicolas Martín, Eduardo L. |
| author_facet | Zhang, Jerry Jun-Yan Lodieu, Nicolas Martín, Eduardo L. |
| contents | We present deep $K_s$-band imaging of the extreme T subdwarf CWISE J221706.28$-$145437.6. Using the new photometry, we construct its spectral energy distribution and find this object exhibits exceptionally strong collision-induced absorption in the $H$ and $K$ bands. The comparison with the nearest benchmark extreme T subdwarf WISEA J181006.18$-$101000.5 suggests the object would be cooler and more metal-poor than the benchmark. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_02022 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $K_s$-band photometry of the Extreme T Subdwarf CWISE J221706.28$-$145437.6 Zhang, Jerry Jun-Yan Lodieu, Nicolas Martín, Eduardo L. Solar and Stellar Astrophysics Earth and Planetary Astrophysics We present deep $K_s$-band imaging of the extreme T subdwarf CWISE J221706.28$-$145437.6. Using the new photometry, we construct its spectral energy distribution and find this object exhibits exceptionally strong collision-induced absorption in the $H$ and $K$ bands. The comparison with the nearest benchmark extreme T subdwarf WISEA J181006.18$-$101000.5 suggests the object would be cooler and more metal-poor than the benchmark. |
| title | $K_s$-band photometry of the Extreme T Subdwarf CWISE J221706.28$-$145437.6 |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2507.02022 |