Just for pedantic remark, brown dwarfs is not stars, but they are substellar objects and formed in the similar fation (and this is why question about edge case

Just for pedantic remark, brown dwarfs is not stars, but they are substellar objects and formed in the similar fation (and this is why question about edge case of very large exoplanted vs very small brown dwarf is interestring)https://en.wikipedia.org/wiki/Substellar_object https://en.wikipedia.org/wiki/Substellar_object definition relies on sustained hydrogen fusion