K<SUB>s</SUB>-band Photometry of the Extreme T Subdwarf CWISE J221706.28‑145437.6

Bibcode
2025RNAAS...9..176Z
DOI
10.3847/2515-5172/aded0b
Zhang, Jerry J. -Y.; Lodieu, Nicolas; Martín, Eduardo L.
Bibliographical reference

Research Notes of the American Astronomical Society

Advertised on:
7
2025
Number of authors
3
IAC number of authors
3
Citations
1
Refereed citations
0
Description
We present deep Ks-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 band. 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. *Based on observations made with the Gran Telescopio Canarias.
Type
Non-refereed
Broad band photometry

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