# The Chemical Evolution of Protoplanetary Disks

## TL;DR

This paper reviews the chemical processes and physical tools used to understand the evolution of chemistry in planet-forming disks, integrating solar system data and observations of extrasolar disks for early planet formation insights.

## Contribution

It synthesizes observational constraints and modeling tools for chemical evolution in protoplanetary disks, highlighting recent advances and methodologies.

## Key findings

- Chemical and physical tools are essential for studying disk evolution.
- Observational constraints from solar system and extrasolar disks inform models.
- Physical prescriptions like irradiation and thermal structure are crucial for modeling.

## Abstract

The origins of planets, and perhaps life itself, is intrinsically linked to the chemistry of planet formation. In this chapter we will attempt to explore the chemistry of planet-forming disks from the perspective of knowledge gained from decades of solar system study, combined with our rapidly growing knowledge of extra-solar protoplanetary disks. Our aim is not to provide a comprehensive survey of the literature, but rather to present the chemical and physical tools that are used to explore chemical evolution during the earliest stages of planet formation. We include a discussion of observational constraints from our solar system and extra-solar disks, thermodynamic equilibrium and chemical kinetics, and the physical prescriptions for various important aspects (X-ray/UV irradiation, thermal structure, molecular adsorption/desorption, ..) that are used in current models. The chapter is aimed for young researchers.