  In massive numerical experiments we show that a planet embedded in a
planetesimal disk induces a characteristic multi-lane "planetosignature"
representing a pattern of several stellar-centric rings. If the planet's mass
is large enough, the multi-lane signature degenerates to a three-lane one: then
it consists of three rings, one bright coorbital 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 disk of HL Tau.
