# Optical Transient from an Explosion Close to the Stellar Surface

## TL;DR

This paper models the hydrodynamic evolution and radiation of explosions near stellar surfaces, predicting observable multi-wavelength transients that can help identify supernova progenitors before explosion.

## Contribution

It introduces a new model for optical transients from near-surface stellar explosions and applies it to historical supernova precursor detection.

## Key findings

- Predicted multi-wavelength transient signatures from surface explosions.
- Applied model to historical supernova precursor event.
- Suggested future optical surveys can detect similar transients.

## Abstract

We study the hydrodynamic evolution of an explosion close to the stellar surface, and give predictions for the radiation from such an event. We show that such an event will give rise to a multi-wavelength transient. We apply this model to describe a precursor burst to the peculiar supernova iPTF14hls, which occurred in 1954, sixty year before the supernova. We propose that the new generation of optical surveys might detect similar transients, and they can be used to identify supernova progenitors well before the explosion.