Even though only a handful of sub-stellar companions have been found via direct imaging , each of these discoveries has had a tremendous impact on our understanding of the star formation process and the physics of cool atmospheres .
Young stars are prime targets for direct imaging searches for planets and brown dwarfs , due to the favorable brightness contrast expected at such ages and also because it is often possible to derive relatively good age estimates for these primaries .
Here we present the direct imaging discovery of HD 284149 b , a 18 - 50 ~ { } M _ { Jup } companion at a projected separation of ∼ 400 AU from a young ( 25 ^ { +25 } _ { − 10 } Myr ) F8 star , with which it shares common proper motion