# The complexity of Orion: an ALMA view III. The explosion impact

## TL;DR

This study uses ALMA observations of Orion to analyze how a recent explosion has affected the distribution and chemistry of complex organic molecules, providing insights into their formation and evolution in star-forming regions.

## Contribution

It presents the first detailed analysis of the impact of a recent explosive event on molecular chemistry and distribution in Orion, enhancing understanding of COM formation.

## Key findings

- Explosion has caused molecular segregation in Orion.
- Some molecules are displaced from dense regions due to explosion.
- Chemistry evolution is influenced by dynamical processes over time.

## Abstract

The chemistry of complex organic molecules in interstellar dark clouds is still highly uncertain in part because of the lack of constraining observations. Orion is the closest massive star-forming region, and observations making use of ALMA allow us to separate the emission regions of various complex organic molecules (COMs) in both velocity and space. Orion also benefits from an exceptional situation, in that it is the site of a powerful explosive event that occurred 550 years ago. We show that the closely surrounding Kleinmann-Low region has clearly been influenced by this explosion; some molecular species have been pushed away from the densest parts while others have remained in close proximity. This dynamical segregation reveals the time dependence of the chemistry and, therefore allows us to better constrain the formation sequence of COMs and other species, including deuterated molecules.