A sub-brown dwarf is a celestial object that falls between the largest planets and the smallest stars, typically having a mass between about 13 and 80 Jupiter masses. These objects are not massive enough to sustain hydrogen fusion in their cores like true stars but can still exhibit some fusion of deuterium, a heavier isotope of hydrogen. Sub-brown dwarfs can have complex atmospheres and may host planetary systems, contributing to the study of planetary formation and evolution.
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