What state do brown dwarfs settle into after their brief deuterium-burning phase concludes?

Answer

They cool down and contract slowly, becoming dim, cold stellar remnants.

Once deuterium fuel is exhausted, energy production ceases, and brown dwarfs transition into a state of slow cooling, emitting faint heat and infrared radiation.

What state do brown dwarfs settle into after their brief deuterium-burning phase concludes?
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