# Cepheid investigations in the era of space photometric missions

## TL;DR

This paper reviews recent advances in Cepheid variable star research enabled by space photometry, highlighting new phenomena, improved distance measurements, and future research opportunities.

## Contribution

It compiles recent findings on Cepheid light variations, binarity, and distance measurement techniques, emphasizing the impact of space missions on these studies.

## Key findings

- Detection of period doubling and modulation in Cepheids
- Identification of low-amplitude additional modes and period jitter
- Signs of granulation observed in Cepheid light curves

## Abstract

Cepheid stars are crucial objects for a variety of topics that range from stellar pulsation and the evolution of intermediate-mass stars to the understanding the structure of the Galaxy and the Universe through the distance measurements they provide. The developments in hydrodynamical calculations, the release of large ground-based surveys, and the advent of continuous, space-based photometry revealed many puzzling phenomena about these stars in the last few years. In this paper I collected some important and new results in the topics of distance measurements and binarity investigations. I also summarize the most recent discoveries in their light variations, such as period doubling, modulation, low-amplitude additional modes, period jitter and the signs of granulation, and discuss the new opportunities that current and future space missions will offer for us.