TOI-5344 b: A Saturn-like Planet Orbiting a Super-solar Metallicity M0 Dwarf

We confirm the planetary nature of TOI-5344 b as a transiting giant exoplanet around an M0-dwarf star. TOI-5344 b was discovered with the Transiting Exoplanet Survey Satellite photometry and confirmed with ground-based photometry (the Red Buttes Observatory 0.6 m telescope), radial velocity (the Habitable-zone Planet Finder), and speckle imaging (the NN-Explore Exoplanet Stellar Speckle Imager). TOI-5344 b is a Saturn-like giant planet (rho = 0.80 -0.15+0.17 g cm-3) with a planetary radius of 9.7 +/- 0.5 R circle plus (0.87 +/- 0.04 R Jup) and a planetary mass of 135-18+17M circle plus (0.42 -0.06+0.05MJup ). It has an orbital period of 3.792622-0.000010+0.000010 days and an orbital eccentricity of 0.06-0.04+0.07 . We measure a high metallicity for TOI-5344 of [Fe/H] = 0.48 +/- 0.12, where the high metallicity is consistent with expectations from formation through core accretion. We compare the metallicity of the M-dwarf hosts of giant exoplanets to that of M-dwarf hosts of nongiants (less than or similar to 8 R circle plus). While the two populations appear to show different metallicity distributions, quantitative tests are prohibited by various sample caveats.