Determine whether IRS1 hosts a rotating disk

Determine whether the gas-phase complex-organic-molecule emission around BHR71-IRS1 traces a rotating disk.

Background

The central component of BHR71-IRS1 exhibits a modest southeast–northwest velocity gradient in the principal-component-weighted position–velocity diagram. Although this structure is consistent with previously reported methanol kinematics and suggests gas-phase complex organic molecules near the outflow axis, the observations do not establish that the emission arises from a disk.

The unresolved disk question is relevant to interpreting the inner structure and rotational dynamics of the protostellar system.

References

The presence of a rotating disk has not been confirmed yet, but these results imply the presence of gas-phase COMs around the outflow axis.

— Complex Organic Molecules in Protostars with ALMA Spectral Surveys (COMPASS) V. Tracing cavity walls and shocked knots with nonthermally desorbed CH$_3$OH in BHR71-IRS1  (2610.09500 - Yun et al., 7 Oct 2026) in Section 4.1, “Central component”