What type of stellar body forms if a collapsing core never reaches the temperature threshold required for true stellar ignition?

Answer

A brown dwarf

If the initial mass is too low, the core never reaches the required temperature, resulting in a body that fails to become a true star, known specifically as a brown dwarf.

What type of stellar body forms if a collapsing core never reaches the temperature threshold required for true stellar ignition?
evolutionstarmassstage