ultracool dwarf
(ultra-cool dwarf)
(star or brown dwarf cooler than M7 class)
The term ultracool dwarf has been used for spectral class
M7 or later (cooler) stars, such as L-type star,
T-type star, Y-type star, and/or brown dwarfs. An example is
TRAPPIST-1. The term was coined for the convenience of studies
relating to this combination of classes.
(star type)
Further reading:
https://en.wikipedia.org/wiki/Ultra-cool_dwarf
https://esahubble.org/images/heic1713b/
https://ui.adsabs.harvard.edu/abs/2013A%26A...556A.133S/abstract
https://ui.adsabs.harvard.edu/abs/2001PASP..113..403S/abstract
https://ui.adsabs.harvard.edu/abs/2020A%26A...637A..45S/abstract
https://ui.adsabs.harvard.edu/abs/2024MNRAS.533.3784B/abstract
https://www.eso.org/public/news/eso1706/
Referenced by pages:
SPECULOOS
Two Micron All-sky Survey (2MASS)
Index