# ALMA polarimetric studies of rotating jet/disk systems

## TL;DR

This study uses ALMA polarimetric data to analyze dust polarization in young jet/disk systems, revealing dust self-scattering as the dominant polarization mechanism, which aids in understanding dust properties and evolution.

## Contribution

It demonstrates that dust self-scattering dominates polarization in young systems, providing a new diagnostic tool for dust properties despite limited magnetic field information.

## Key findings

- Dust self-scattering dominates polarization patterns.
- Polarization data inform dust properties and evolution.
- Magnetic field information cannot be derived from these polarization patterns.

## Abstract

We have recently obtained polarimetric data at mm wavelengths with ALMA for the young systems DG Tau and CW Tau, for which the rotation properties of jet and disk have been investigated in previous high angular resolution studies. The motivation was to test the models of magneto-centrifugal launch of jets via the determination of the magnetic configuration at the disk surface. The analysis of these data, however, reveals that self-scattering of dust thermal radiation dominates the polarization pattern. It is shown that even if no information on the magnetic field can be derived in this case, the polarization data are a powerful tool for the diagnostics of the properties and the evolution of dust in protoplanetary disks.