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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the discovery of 76 new T dwarfs from the UKIDSS Large Area Survey(LAS). Near-infrared broad and narrow-band photometry and spectroscopy arepresented for the new objects, along with WISE and warm-Spitzer photometry.Proper motions for 128 UKIDSS T dwarfs are presented from a new two epoch LASproper motion catalogue. We use these motions to identify two new benchmarksystems: LHS 6176AB, a T8+M4 pair and HD118865AB, a T5.5+F8 pair. Using ageconstraints from the primaries and evolutionary models to constrain the radiiwe have estimated their physical properties from their bolometric luminosity.We compare the colours and properties of known benchmark T dwarfs to the latestmodel atmospheres and draw two principal conclusions. Firstly, it appears thatthe H - [4.5] and J - W2 colours are more sensitive to metallicity than haspreviously been recognised, such that differences in metallicity may dominateover differences in Teff when considering relative properties of cool objectsusing these colours. Secondly, the previously noted apparent dominance of youngobjects in the late-T dwarf sample is no longer apparent when using the newmodel grids and the expanded sample of late-T dwarfs and benchmarks. This issupported by the apparently similar distribution of late-T dwarfs andearlier-type T dwarfs on reduced proper motion diagrams that we present.Finally, we present updated space densities for the late-T dwarfs, and compareour values to simulation predictions and those from WISE.

Seventy six T dwarfs from the UKIDSS LAS: benchmarks, kinematics and an updated space density