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 report the identification of 2MASS J15500845+1455180 as a 0"9 L dwarfvisual binary. This source is resolved in Sloan Digital Sky Survey (SDSS)images and in near-infrared imaging with the IRTF SpeX imager/spectrometer. Thetwo components, oriented along a north-south axis, have similar brightnesses inthe near-infrared (Delta{K} ~ 0.2 mag), although the fainter northern componentis redder in J-K color. Resolved near-infrared spectroscopy indicates spectraltypes of L3.5 and L4, consistent with its L3 combined-light opticalclassification based on SDSS data. Physical association is confirmed throughcommon proper motion, common spectrophotometric distances and low probabilityof chance alignment. The projected physical separation of 2MASS J1550+1455AB,30+/-3 AU at an estimated distance of 33+/-3 pc, makes it the widest L dwarf-Ldwarf pair identified to date, although such a separation is not unusual amongvery low-mass field binaries. The angular separation and spectral compositionof this system makes it an excellent target for obtaining a precise lithiumdepletion age, and a potential age standard for low-temperature atmospherestudies.

Resolved Spectroscopy of M Dwarf/L Dwarf Binaries. III. The "Wide" L3.5/L4 Dwarf Binary 2MASS J15500845+1455180AB