M dwarf stars with high metallicity are the only ones in this sample found with large planets, and very short-period planets orbit more metal-rich M dwarfs, with a transition near 4.3 days.
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Metallicities of M Dwarf Planet Host Stars from Kepler, K2, and TESS observed by APOGEE: Trends with Exoplanetary Radii and Orbital Periods
M dwarf stars with high metallicity are the only ones in this sample found with large planets, and very short-period planets orbit more metal-rich M dwarfs, with a transition near 4.3 days.