Description
Dense cores are the places where stars are formed within the supersonic Molecular Clouds. These dense regions (n~10^5 cc) are cold (T~10 K) and display subsonic levels of turbulence (Mach ~ 0.5), and represent the initial conditions for both star and disk formation. However, the influence of the parental core properties on the disk formation process is still not well constrained, and it is crucial to study dense cores with interferometers to better understand the dense core and disk connection. Recent NOEMA observations of a Class 0 object reveal a previously unseen large-scale (~10,000 au) streamer of fresh gas from the surrounding dense core down to the disk scales. This streamer is unrelated to the outflow, and it is well modeled using a free-falling streamline. We estimate an infall rate comparable to the accretion rate onto the protostar. This clearly shows that accretion via streamer can have an important role in star/disk formation. Finally, I will present new results of streamers on other sources showing similar evidence for streamers and discuss their possible role that streamers would play affecting the dust properties at disk forming scales.
