Qiuyi Luo (University of Tokyo) - Deciphering Multiple System Formation Across Diverse Galactic Environments

Over half of all stars reside in multiple systems, a direct outcome of the star formation process. Understanding their origin is key to linking stellar birth to significant phenomena, such as gravitational waves and galaxy evolution. With the high-resolution power of ALMA, we are now resolving embedded Young Stellar Objects expanding from the solar neighborhood to diverse Galactic star-forming environments. In this talk, I will present results from two multiplicity surveys that statistically examine the formation mechanisms of multiple systems across different environments. Our analysis reveals that their multiplicity metrics are sensitive to environmental conditions. We demonstrate that the 'core fragmentation' mechanism is intrinsically regulated by higher-pressure conditions in high mass star-forming regions - driven by turbulence and density in the intraclump medium. We first identify the largest sample of high-mass disks to date, offering a definitive catalog for studying high-mass binary formation via 'disk fragmentation'. Taken together these results provide a comprehensive first look a the available formation pathways from observational views, establishing a broader context for how multiple systems are assembled.