Three-lane and multilane signatures of planets in planetesimal discs

Abstract In massive numerical experiments we show that a planet embedded in a planetesimal disc induces a characteristic multilane ‘planetosignature’ representing a pattern of several stellar-centric rings. If the planet's mass is large enough, the multilane signature degenerates to a three-lane one: then it consists of three rings, one bright co-orbital with the planet, and two dark gaps in the radial distribution of the particles. The gaps correspond to orbital resonances 2:1 and 1:2 with the planet. This theoretical prediction may explain recent ALMA observations of the disc of HL Tau.