The stellar initial mass function of nearby young moving groups

January 19, 2026

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Key Points

This study aims to derive the initial mass function (IMF) of young nearby moving groups (NYMGs) of stars.
Developed an algorithm to detect moving groups in kinematic space using photometric and astrometric data.
Analyzed data from DR3 to identify over-densities in young isochrones.
Estimated individual masses of detected candidates and previously known members.
Parameterised the IMFs using log-normal and power-law functions.
Estimated IMFs for 33 groups, with 30 assessed for the first time.
Average mass range of 0.1 to 5 solar masses, with some groups as low as 0.02 and as high as 10 solar masses.
Detected 4166 candidate members, recovering 44-54% of known literature candidates.
Estimated contamination rate from old field stars at 16-24%.

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This research demonstrates the initial mass function of young moving groups, suggesting they are remnants of stellar associations.

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Bertolotto-Stefanelli et al. (2026) studied this question.

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