[P-AE16] 系外惑星

[PAE16-12] Multi-planetary systems deduced from the observed ALMA disks: initial conditions and evolutionary outcomes

*Shijie Wang¹、Kazuhiro D Kanagawa^1,2、Toshinori Hayashi¹、Yasushi Suto¹ (1.University of Tokyo、2.Ibaraki University)

キーワード：Protoplanetary disks, Planet formation

Since the discovery of the ring/gap substructure of the HL Tau disk in 2015, recent high-resolution ALMA/DSHARP observations have resolved more similar substructures on nearby protoplanetary disks. Theories have predicted that a massive planet can carve a gap in the disk as it grows, therefore these substructures were promisingly related to the planetary origin. Following this interpretation, it is possible to constrain the semi-major axis and even planetary mass from the morphology of the gaps. In Wang et al. 2020, we carried out N-body simulations to evolve the HL Tau planetary system from the current configuration up to 10 Gyrs after the disk dispersal, with implementation of both planetary migration and gas accretion schemes coupled with the the disk profile. By varying the disk parameters, we produced a variety of widely-separated planetary systems consisting of three super-Jupiters at the end of the disk dispersal. Most of the systems are found to be stable for at least 10 Gyr in a marginal resonance state. Our recent work expands the targets to other ALMA disks and considers alternative initial planetary mass estimates based on the dust-gap-only and gas-gap scenarios. We show it is possible to break the degeneracy for some gaps by considering the consistency of the predicted mass with the planetary formation model.