# The Dispersal of Planet-forming discs: Theory confronts Observations

## TL;DR

This paper reviews observational data and theoretical models on the evolution and dispersal of planet-forming discs, emphasizing transition discs, to better understand how planetary systems develop.

## Contribution

It synthesizes current empirical constraints and theoretical models, highlighting key areas for future research in disc dispersal and planet formation.

## Key findings

- Transition discs provide insights into disc clearing processes.
- Theoretical models align with observations on disc dispersal timescales.
- Identifies gaps in understanding of disc evolution stages.

## Abstract

Discs of gas and dust around Myr-old stars are a by-product of the star formation process and provide the raw material to form planets. Hence, their evolution and dispersal directly impact what type of planets can form and affect the final architecture of planetary systems. Here, we review empirical constraints on disc evolution and dispersal with special emphasis on transition discs, a subset of discs that appear to be caught in the act of clearing out planet-forming material. Along with observations, we summarize theoretical models that build our physical understanding of how discs evolve and disperse and discuss their significance in the context of the formation and evolution of planetary systems. By confronting theoretical predictions with observations, we also identify the most promising areas for future progress.