# Simulating a binary system that experiences the grazing envelope evolution

## TL;DR

This study uses 3D hydrodynamical simulations to explore how jets launched by a secondary star can inflate the envelope of a giant star, delay the common envelope phase, and potentially alter binary evolution outcomes.

## Contribution

It introduces the concept of grazing envelope evolution driven by jets, highlighting their potential to influence or prevent common envelope phases in binary systems.

## Key findings

- Jets inflate the envelope and eject some mass.
- The common envelope phase can be postponed by jet activity.
- Simulations show jets may prevent or alter common envelope evolution.

## Abstract

We conduct three-dimensional hydrodynamical simulations, and show that when a secondary star launches jets while performing spiral-in motion into the envelope of a giant star, the envelope is inflated, some mass is ejected by the jets, and the common envelope phase is postponed. We simulate this grazing envelope evolution (GEE) under the assumption that the secondary star accretes mass from the envelope of the asymptotic giant branch (AGB) star and launches jets. In these simulations we do not yet include the gravitational energy that is released by the spiraling-in binary system. Neither do we include the spinning of the envelope. Considering these omissions, we conclude that our results support the idea that jets might play a crucial role in the common envelope evolution, or in preventing it.