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D\\'iaz, Nicholas Law, Pamela Rowden, Robert F. Goeke, Roland Vanderspek, Ryan Cloutier, Sara Seager","submitted_at":"2020-09-28T20:58:53Z","abstract_excerpt":"We present the discovery of TOI 540 b, a hot planet slightly smaller than Earth orbiting the low-mass star 2MASS J05051443-4756154. The planet has an orbital period of $P = 1.239149$ days ($\\pm$ 170 ms) and a radius of $r = 0.903 \\pm 0.052 R_{\\rm Earth}$, and is likely terrestrial based on the observed mass-radius distribution of small exoplanets at similar insolations. The star is 14.008 pc away and we estimate its mass and radius to be $M = 0.159 \\pm 0.014 M_{\\rm Sun}$ and $R = 0.1895 \\pm 0.0079 R_{\\rm Sun}$, respectively. 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