The ALMA Map and Model of the HH 211 Protostellar Disk

(a) The map of the disk obtained by ALMA in dust emission. A Solar System size scale is added for the size comparison. (b) A highpass filter was applied to remove the smooth structure of the disk, in order to reveal the 3 linear structures (as marked by 3 dotted lines) perpendicular to the disk axis. (c) A disk model that can reproduce the disk structure. The left and right linear structures can be reproduced by the two warm disk surfaces, while the middle one is produced by the warm spiral arm in the midplane. (d) A face-on view of the disk model to show the full structure of the spiral arms. The spiral arms are trailing with their outer tip pointing in the direction opposite to the disk rotation. Credit: Lee et al.