# Resolved ALMA continuum image of the circumbinary ring and circumstellar disks in the L1551 IRS 5 system

## TL;DR

This study uses ALMA observations to resolve and analyze the structure of the circumbinary ring and circumstellar disks in the L1551 IRS 5 system, providing new insights into their geometry and mass distribution.

## Contribution

First resolved the circumbinary ring in L1551 IRS 5 using ALMA, and estimated the geometry and mass of the circumstellar disks with simple models.

## Key findings

- Resolved the circumbinary ring for the first time.
- Estimated lower mass limits for the circumstellar disks.
- Identified brightness asymmetries explained by geometrical effects.

## Abstract

L1551 IRS 5 is a FUor-like object located in the Taurus star forming region. We present ALMA 1.3 mm continuum observations using a wide range of baselines. The observations recovered the two circumstellar disks composing the system and, for the first time, resolved the circumbinary ring. We determined the geometry and estimated lower mass limits for the circumstellar disks using simple models. We calculated lower limits for the total mass of both circumstellar disks. After subtracting the two circumstellar disk models from the image, the residuals show a clearly resolved circumbinary ring. Using a radiative transfer model, we show that geometrical effects can explain some of the brightness asymmetries found in the ring. The remaining features are interpreted as enhancements in the dust density.