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Nice followup from the APOGEE-N spectra of Kepler KOI objects. They provide mass and radii for low mass stellar companions from radial velocity measurements. Maybe a bit concerning that 8 out of 28 in their stellar companions had been classified as planet candidates from statistical validation.

https://arxiv.org/abs/2302.07713
Caleb I. Cañas, Chad F. Bender, Suvrath Mahadevan, etal.