# The Impact of Enhanced EUV Flux on the Upper Atmosphere of Earth-like Exoplanets

## TL;DR

This study investigates how increased EUV radiation affects the stability and atmospheric escape of Earth-like exoplanets, revealing a critical flux threshold beyond which atmospheres rapidly escape, especially in close orbits.

## Contribution

It provides the first detailed modeling of EUV flux impact on exoplanet atmospheres using GITM, highlighting the limitations of 1D models and identifying a flux threshold for atmospheric stability.

## Key findings

- Enhanced EUV flux inflates and elevates the ionosphere.
- 1D models are limited in capturing global atmospheric variations.
- Atmospheric escape accelerates above a flux factor of 10, around 0.3AU from the star.

## Abstract

Identifying Earth-like planets outside out solar system is a leading research goal in astronomy, but determining if candidate planets have atmospheres, and more importantly if they can retain atmospheres, is still out of reach. In this paper, we present our study on the impact of enhanced EUV flux on the stability and escape of the upper atmosphere of an Earth-like exoplanet using the Global Ionosphere and Thermosphere Model (GITM). We also investigate the differences between one- and three-dimensional solutions. We use a baseline case of EUV flux experienced at the Earth, and multiplying this flux by a constant factor going up to 50. Our results show a clear evidence of an inflated and elevated ionosphere due to enhanced EUV flux, and they provide a detailed picture of how different heating and cooling rates, as well as the conductivity are changing at each EUV flux level. Our results also demonstrate that one-dimensional solutions are limited in their ability to capture a global atmosphere that are not uniform. We find that a threshold EUV flux level for a stable atmosphere occurs around a factor of 10 times the baseline level, where EUV fluxes above this level indicate a rapidly escaping atmosphere. This threshold EUV flux translates to about 0.3AU for a planet orbiting the Sun. Thus, our findings indicate that an Earth-like exoplanet orbiting its host star in a close-in orbit is likely to lose its atmosphere quickly.