J/ApJ/871/174 Kepler rapid rotators and Ks-band excesses (Simonian+, 2019) ================================================================================ Rapid rotation in the Kepler field: not a single star phenomenon. Simonian G.V.A., Pinsonneault M.H., Terndrup D.M. =2019ApJ...871..174S ================================================================================ ADC_Keywords: Abundances, [Fe/H]; Photometry, infrared; Magnitudes, absolute; Stars, late-type; Stars, double and multiple Keywords: binaries: close ; stars: late-type ; stars: rotation Abstract: Tens of thousands of rotation periods have been measured in the Kepler fields, including a substantial fraction of rapid rotators. We use Gaia parallaxes to distinguish photometric binaries (PBs) from single stars on the unevolved lower main sequence, and compare their distribution of rotation properties to those of single stars both with and without Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectroscopic characterization. We find that 59% of stars with 1.5day