Oral Presentation

From core collapse to observable streamers: synthetic signatures of asymmetric accretion

Author(s): Vianey Camacho, NTNU; Yueh-Ning Lee, NTNU

Presenter: Vianey Camacho (NTNU)

Embedded disks are actively fed by their surrounding envelopes, yet the origin of the elongated accretion structures known as "streamers" remains uncertain. Recent high-resolution observations have revealed streamer-like inflows around deeply embedded protostars, indicating that asymmetric accretion may play a significant role during the earliest stages of disk assembly. We explore a new mechanism for streamer formation based on unstable perturbation modes during gravitational collapse. Introducing low-order perturbations, we perform hydrodynamic simulations and corresponding synthetic observations. Our preliminary results show that modest initial asymmetries naturally generate coherent elongated inflow structures with streamer-like morphologies. These structures emerge during the embedded collapse phase, before the formation of a fully evolved protostar-disk system. These results suggest that streamers may arise naturally from the collapse dynamics of prestellar cores, providing a new mechanism for asymmetric accretion during the earliest phases of star and disk formation.