# The Expanding Photosphere Method: Progress and Problems

## TL;DR

This paper updates the Expanding Photosphere Method for measuring distances to Type II-P supernovae, showing improved accuracy and agreement with other methods, addressing previous biases and limitations.

## Contribution

The paper presents an improved EPM based on recent models, demonstrating better accuracy and no significant bias compared to earlier versions.

## Key findings

- EPM distances align well with independent measurements
- No significant systematic bias found in new EPM results
- Method accuracy is comparable to Type Ia supernova distance estimates

## Abstract

Distances to well-observed Type II-P SNe are determined from an updated version of the Expanding Photosphere Method (EPM), based on recent theoretical models. The new EPM distances show good agreement with other independent distances to the host galaxies without any significant systematic bias, contrary to earlier results in the literature. The accuracy of the method is comparable with that of the distance measurements for Type Ia SNe.