Looking for faint companions

The left side shows a raw image, while the right side shows the result after the newly developed technique was applied. Thanks to this technique it is possible to study the faint AB Doradus C (about 100 times fainter than its host), once the contamination from the brighter AB Doradus A and the artefacts due to atmospheric turbulence are subtracted. AB Doradus is the closest faint companion ever detected by imaging.