Poster Presentation
Shaping multiplicity in star forming regions
Presenter: Troels Haugboelle (Niels Bohr Institute)
Multiplicity plays a significant role in the formation and evolution of protostars, their disks, and the resulting planetary systems. While many systems are initially multiple, their longevity is often hindered by close encounters and tidal forces in the star-forming region. Understanding the impact of multiplicity on the early stages of star, planet, and disk evolution is therefore crucial. Observations of protostars in star-forming regions reveal a bimodal distribution in the separations of young binary/multiple star systems. Larger separations (3000 AU) are often attributed to core fragmentation, while smaller separations (100 AU) are associated with disc fragmentation. Furthermore, recent interferometric observations of protostellar multiples have shown that the birth environment hosts multiple gas and dust streamers feeding the young stars, interconnecting gas bridges, and in general misaligned disks and outflows.
I will show how we can use global models of star-forming regions to learn about the statistics of formation pathways, and AU-scale zoom-in models, drawn from the global models, to serve as analogues to specific observations of both binary and multiple systems. The models demonstrate the significant role that the environment and early evolution of young stellar systems play in shaping their characteristics, and how turbulent fragmentation naturally promotes the infall of wide binaries, creating systems with small separations. The episodic accretion bursts also impact the distribution of volatiles and refractories, alter the location of snow lines, and influence disk size, potentially affecting the timing and tempo of planetesimal and planet formation, as well as the resulting planetary architecture.
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