Scientists have often wondered how big a gas cloud had to be, before the collapse due to it's own gravity would turn it from a large planet into a small star. They have found gas giants, and brown dwarfs either side, but this is the closest to the line. There will probably be a few 'missing links', because beside the mass, the flash point could depend on what the clouds are made of.
Scientists always love it when they find something that needs a new category.