Initially, it was only possible to infer the presence from exoplanets indirectly from the way they made their star wobble, or when they transited in front of the star, dimming it slightly. Direct imaging has only become feasible recently. As Paul Gilster writes on Centauri Dreams, we now have an image of an exoplanet orbiting two binary stars, taken the old-fashioned way, by capturing its photons.
Nehaveigur 