Spirals and clump-like protoplanets in AB Aur transition disk. (a) ALMA image (Tang et al. 2017) of the ¹²CO J = 2–1 (cyan) inner spirals detected inside the mm dust ring (red) with the two putative planets (P1 and P2 crosses). (b) Spirals with a twist structure detected in NIR using SPHERE/VLT (Boccaletti et al. 2020). The green solid curve marks the best-fit model reproducing the spiral twist near the perturber (P1, green circle). The CO spot is in white contours. The green dashed curve marks the model offset by 14.1°, corresponding to the Keplerian rotation in 4 yrs of ALMA (Nov. 2015) and SPHERE (Dec. 2019) data. The two bright spots (CO and NIR) are separated by a distance in agreement with an embedded planet rotating at the Keplerian speed measured from previous CO observations. The white arrow marks the rotation direction of the disk.