Jupiter is not a brown dwarf star even though it emits radio waves and has a hydrogen-forming element.
because the star fails / brown dwarfs are born just like the stars in general from the ruins of clouds of interstellar gas and dust, whereas Jupiter is not like that. Jupiter's mass is below the minimum mass of a brown dwarf.
Jupiter has a heat source and emits 1.6 times the energy received from the sun. although very hot in the core, Jupiter still cannot generate nuclear reactions to burn hydrogen like the sun because Jupiter does not have massive pressure and temperature internal pressure and enough to burn the hydrogen gas in the core.