# Time-domain Studies of M31

## TL;DR

This paper reviews recent wide-field, high cadence surveys of M31, highlighting advances in understanding its variable stars and transients, and discusses future research opportunities enabled by upcoming observational facilities.

## Contribution

It provides a comprehensive overview of recent survey progress and outlines future directions for studying M31's variable stellar populations.

## Key findings

- Complete census of variable stars in M31 enabled by wide-field surveys
- Identification of diverse variable and transient populations in M31
- Future surveys will further enhance understanding of galaxy evolution

## Abstract

M31, our closest neighboring galaxy, is a stepping stone to studies of stellar evolution, star formation, galaxy evolution, and cosmology. However, due to the difficulties of performing photometry in such crowded fields and the lack of wide cameras to encompass the entire galaxy, there has not been a complete census of the stellar contents of M31. The advent of wide-field camera provides us a unique opportunity to have a complete view of our neighboring galaxy, enabling an inventory of its variable content. We present a review of recent progresses of wide-field, high cadence surveys of M31, covering different population of variables and transients. We also outline future studies enabled by on-going and up-coming facilities.