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New Cold Subdwarf Discoveries from Backyard Worlds and a Metallicity Classification System for T Subdwarfs

Authors: Adam J. Burgasser, Adam C. Schneider, Aaron M. Meisner, Dan Caselden, Chih-Chun Hsu, Roman Gerasimov, Christian Aganze, Emma Softich, Preethi Karpoor, Christopher A. Theissen, Hunter Brooks, Thomas P. Bickle, Jonathan Gagné, Ètienne Artigau, Michaël Marsset, Austin Rothermich, Jacqueline K. Faherty, J. Davy Kirkpatrick, Marc J. Kuchner, Nikolaj Stevnbak Andersen, Paul Beaulieu, Guillaume Colin, Jean Marc Gantier, Leopold Gramaize, Les Hamlet, Ken Hinckley, Martin Kabatnik, Frank Kiwy, David W. Martin, Diego H. Massat, William Pendrill, Arttu Sainio, Jörg Schümann, Melina Thévenot, Jim Walla, Zbigniew Wędracki

Adam J. Burgasser et al 2025 The Astrophysical Journal 982 .

Provider: AAS Journals

Caption: Figure 13.

Spectral sequences for mild subdwarfs (d/sd; left), subdwarfs (sd; middle) and extreme subdwarfs (esd; right) for late-L and -T dwarfs in our spectral sample. All data are smoothed to an equivalent resolution of λ/Δλ = 300, normalized at the 1.25 μm peak and offset by constants (dashed lines; 0.5 steps for d/sd and sd, 0.75 steps for esd). Standards are identified by name and spectral type.

(The data used to create this figure are available in the online article.)

(The data used to create this figure are available.)

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