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Primeval very low-mass stars and brown dwarfs โ€“ IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary

Primeval very low-mass stars and brown dwarfs โ€“ IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary

We present 27 new L subdwarfs and classify five of them as esdL and 22 as sdL. Our L subdwarf candidates were selected with the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Spectroscopic follow-up was carried out primarily with the OSIRIS spectrograph on the Gran Telescopio Canarias. โ€ฆ