# Gas infall and possible circumstellar rotation in R Leo

## TL;DR

This study uses high-resolution ALMA observations to reveal complex gas dynamics, including infall and possible rotation, in the innermost envelope of the star R Leo, indicating a structured circumstellar environment.

## Contribution

First high-resolution interferometric imaging of R Leo's inner envelope showing non-radial gas motions and potential circumstellar rotation.

## Key findings

- Detection of red-shifted absorption indicating gas infall
- Evidence of a torus-like structure around R Leo
- Complex non-radial gas velocity distribution

## Abstract

We present new interferometer molecular observations of R Leo taken at 1.2 mm with the Atacama Large Millimeter Array with an angular resolution up to ~0.026 arcsec. These observations permit us to resolve the innermost envelope of this star revealing the existence of a complex structure that involves extended continuum emission and molecular emission showing a non-radial gas velocity distribution. This molecular emission displays prominent red-shifted absorptions located right in front to the star typical of material infall and lateral gas motions compatible with the presence of a torus-like structure.