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One of the most poorly understood aspects of low-mass star formation is howmultiple-star systems are formed. Here we present the results of Atacama LargeMillimeter/submillimeter Array (ALMA) Band-6 observations towards a formingquadruple protostellar system, G206.93-16.61E2, in the Orion B molecular cloud.ALMA 1.3 mm continuum emission reveals four compact objects, of which two areClass I young stellar objects (YSOs), and the other two are likely inprestellar phase. The 1.3 mm continuum emission also shows three asymmetricribbon-like structures that are connected to the four objects, with lengthsranging from $\sim$500 au to $\sim$2200 au. By comparing our data withmagneto-hydrodynamic (MHD) simulations, we suggest that these ribbons traceaccretion flows and also function as gas bridges connecting the memberprotostars. Additionally, ALMA CO J=2-1 line emission reveals a complicatedmolecular outflow associated with G206.93-16.61E2 with arc-like structuressuggestive of an outflow cavity viewed pole-on.

ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): A forming quadruple system with continuum `ribbons' and intricate outflows