# Revealing signatures of planets migrating in protoplanetary discs with ALMA multi-wavelength observations

## TL;DR

This study uses multiwavelength ALMA observations and hydrodynamic simulations to identify signatures of planetary migration in protoplanetary discs, revealing how different migration speeds produce distinct ring structures.

## Contribution

It introduces a method to detect planetary migration signatures in discs using multiwavelength ALMA data and characterizes the resulting ring morphologies.

## Key findings

- Slow migration produces a single outer ring.
- Fast migration results in a single inner ring.
- Intermediate migration creates rings on both sides of the planet.

## Abstract

Recent observations show that rings and gaps are ubiquitous in protoplanetary discs. These features are often interpreted as being due to the presence of planets; however, the effect of planetary migration on the observed morphology has not been investigated hitherto. In this work we investigate whether multiwavelength mm/submm observations can detect signatures of planet migration, using 2D dusty hydrodynamic simulations to model the structures generated by migrating planets and synthesising ALMA continuum observations at 0.85 and 3 mm. We identify three possible morphologies for a migrating planet: a slowly migrating planet is associated with a single ring outside the planet's orbit, a rapidly migrating planet is associated with a single ring inside the planet's orbit while a planet migrating at intermediate speed generates one ring on each side of the planet's orbit. We argue that multiwavelength data can distinguish multiple rings produced by a migrating planet from other scenarios for creating multiple rings, such as multiple planets or discs with low viscosity. The signature of migration is that the outer ring has a lower spectral index, due to larger dust grains being trapped there. Of the recent ALMA observations revealing protoplanetary discs with multiple rings and gaps, we suggest that Elias 24 is the best candidate for a planet migrating in the intermediate speed regime.