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2025RNAAS...9..176Z - Research Notes of the AAS, 9, 176 (2025/July-0)

Ks-band Photometry of the Extreme T Subdwarf CWISE J221706.28-145437.6.

ZHANG J.J.-Y., LODIEU N. and MARTIN E.L.

Abstract (from CDS):

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.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Brown dwarfs - T dwarfs - T subdwarfs - Broad band photometry - Metallicity

Simbad objects: 3

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