All-sky Co-moving Recovery Of Nearby Young Members. (ACRONYM) II: The Beta Pictoris Moving Group
Evgenya L. Shkolnik, Katelyn N. Allers, Adam L. Kraus, Michael C. Liu,, Laura Flagg

TL;DR
This study confirms 85 members of the Beta Pictoris Moving Group, including 41 new low-mass systems, refining the group's age, mass distribution, and membership census through spectroscopic and photometric analysis.
Contribution
It provides the most complete census of BPMG members, introduces new low-mass discoveries, and evaluates the group's age and initial mass function with improved methods.
Findings
Confirmed 66 low-mass members and 19 companions, 41 of which are new.
Estimated the group age at 22 +/- 6 Myr.
Revealed a deficit of 0.2-0.3 Msun stars in the IMF.
Abstract
We confirm 66 low-mass stellar and brown dwarf systems (K7-M9) plus 19 visual or spectroscopic companions of the beta Pictoris Moving Group (BPMG). Of these, 41 are new discoveries, increasing the known low-mass members by 45%. We also add four objects to the 14 known with masses predicted to be less than 0.07 Msun. Our efficient photometric+kinematic selection process identified 104 low-mass candidates which we observed with ground-based spectroscopy. We collected infrared observations of the latest spectral types (>M5) to search for low gravity objects. These and all <M5 candidates were observed with high-resolution optical spectrographs to measure the radial velocities and youth indicators, such as lithium absorption and H-alpha emission, needed to confirm BPMG membership, achieving a 63% confirmation rate. We also compiled the most complete census of the BPMG membership with which…
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