Oral Presentation

Spiral features in high-mass protostellar cores at 100 au scales

Author(s): Fernando Olguin

Presenter: Fernando Olguin choupay (NTHU)

Recent high-resolution observations with ALMA have started to show spiral-like substructures associated with accretion streamers within high-mass protostellar cores. Numerical simulations suggest that matter can be funneled through these accretion streamers, producing accretion bursts with high infall rates. This accretion mode can overcome the radiation pressure/ionization, allowing high-mass stars to continue increasing in mass. In addition, streamers can become unstable allowing the formation of stellar companions. As part of the Digging into the Interior of Hot Cores with ALMA (DIHCA) we have observed 30 high-mass star-forming regions at 100 au scales. In this presentation, we will show the first results of our high-resolution continuum observations investigating the presence of spirals and characterizing their properties. In particular, we will show a detailed view of the high mass core G336.01–0.82, which exhibits 2 accretion streams feeding a protostellar disk. We derive properties of the infalling spiral streams and the disk, indicating that high accretion rates can be achieved by accretion streamers.