English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present 27 new L subdwarfs and classify five of them as esdL and 22 assdL. Our L subdwarf candidates were selected with the UKIRT Infrared Deep SkySurvey and Sloan Digital Sky Survey. Spectroscopic follow-up was carried outprimarily with the OSIRIS spectrograph on the Gran Telescopio Canarias. Some ofthese new objects were followed up with the X-shooter instrument on the VeryLarge Telescope. We studied the photometric properties of the population ofknown L subdwarfs using colour-spectral type diagrams and colour-colourdiagrams, by comparison with L dwarfs and main-sequence stars, and identifiednew colour spaces for L subdwarf selection/study in current and future surveys.We further discussed the brown dwarf transition-zone and the observationalstellar/substellar boundary. We found that about one-third of 66 known Lsubdwarfs are substellar objects, with two-thirds being very low-mass stars. Wealso present the Hertzsprung-Russell diagrams, spectral type-absolute magnitudecorrections, and tangential velocities of 20 known L subdwarfs observed by theGaia astrometry satellite. One of our L subdwarf candidates, ULASJ233227.03+123452.0, is a mildly metal-poor spectroscopic binary brown dwarf: a~L6p dwarf and a ~T4p dwarf. This binary is likely a thick disc memberaccording to its kinematics.

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