Brown dwarfs are too large to be planets and too small to be stars, but they have gaseous atmospheres that may have all the ingredients needed for life
Source:
https://www.newscientist.com/article/2218948-microbial-life-might-drift-in-the-atmospheres-of-failed-stars/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home