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  1. ; (, Research Notes of the AAS)
    Abstract Based on radial velocities, EXORAP photometry, and activity indicators, the HArps-n red Dwarf Exoplanet Survey (HADES) team reported a 16.3 days rotation period for the M dwarf GJ 3942. However, an estimate of the magnitude-squared coherence between the HADES RV and Hαtime series has significant peaks at frequencies 1/16 day−1and 1/32 day−1. We turn to TESS photometry to test the hypothesis that the true rotation period is 32 days with 16 days harmonic. Although the average TESS periodogram has peaks at harmonics of 1/16 day−1, the harmonic sequence is not fully resolved according to the Rayleigh criterion. The TESS observations suggest a 1/16 day−1rotation frequency and a 1/32 day−1subharmonic, though resolution makes the TESS rotation detection ambiguous. 
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    Free, publicly-accessible full text available November 25, 2025