Speaker
Description
Elongated infalling structures, known as streamers, are increasingly observed around young stellar objects (YSOs), suggesting anisotropic accretion onto protoplanetary disks. These features may influence disk evolution by inducing shocks, transporting chemically distinct material, and triggering accretion variability, yet their physical origin remains uncertain. We explore a new mechanism for streamer formation based on the interaction of misaligned instability modes during gravitational collapse. Using perturbative experiments on a Larson-Penston-type solution, we introduce non-spherical perturbations via spherical harmonics, focusing on low-order modes ($\mathcal{l} =1,2$), which represent realistic asymmetries in prestellar cores, and study their coupling with rotation during collapse. These modes naturally generate coherent, elongated inflow structures resembling weak streamers, while higher-order perturbations are suppressed. We are developing numerical simulations and corresponding synthetic observations to directly compare model predictions with observational diagnostics. Our preliminary results suggest that modest initial asymmetries in collapsing cores can provide a complementary pathway for the formation of streamers around embedded YSOs.
| Participate the oral/poster presentation award competition | No |
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