Poster title: Monitoring of planet variability with SPHERE-IRDIS Poster abstract: We developed a method to derive the higher photometric precision on close- in planets, by monitoring the speckle background below them, on SPHERE-IRDIS observations. Using this method, we lowered the RMS of the temporal flux on Beta Pictoris b by 2% in K12 and H23 bands, reaching a 2.5% RMS at best.