[PPS04-P05] ALMA Observation of AB Aur: the Inner Gaseous Spirals Observed inside the Dust Cavity
Keywords:protoplanetary disk, planet formation, ALMA
One possible scenario to explain the observed morphology of dust and gas is the disturbances by (an) unseen companion(s). A massive planet at approximately 80 AU from the central star may explain the both spiral structures in gas and dust ring. It is known from near infrared imaging observations that the disk morphology in the outer part of the disk does not change over 5.8 year period. The companion at this radius is far enough from the central star so that the patterns that the companion induces do not change very much. However, this 80 AU companion only does not explain all the morphology. Additional companion at inner radii (which is inaccessible with near infrared imaging observations about a decade ago) or disk warp could be responsible for inner disk structures.
This presentation is based on Tang et al. (2017), which is submitted to AAS Journals.