Protostars and Planets VI, Heidelberg, July 15-20, 2013
Statistics of hierarchical multiplicity of nearby solar-type stars
Tokovinin, Andrei (CTIO)
The sample of 4846 F,G dwarfs within 67 pc of the Sun is used to study the unbiased statistics of hierarchical multiple systems. The selection effects are known and taken into account. The fraction of systems with ≥3 companions is 14%. Model of the joint distribution of periods and mass ratios at different hierarchical levels is developed. Sub-systems are slightly more frequent in the components of wide binaries than among all targets, suggesting a mixture of binary-rich and binary-poor populations in the field. Simultaneous presence of sub-systems in both components of wide pairs shows that 2+2 quadruples form frequently.
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