# # Program information file # PROGRAM_ID 2021A024 PROGRAM_TITLE Precision Fundamental Properties of M Dwarf Stars using Eclipsing Binaries from TESS PROGRAM_INV1 Eunkyu Han PROGRAM_INV2 PROGRAM_INV3 PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT stellar PROGRAM_ABSTRACT_BEG M dwarfs make up over 70% of stars by number in the Milky Way Galaxy and are known to host at least two exoplanets per star. Using mutually eclipsing double-lined spectroscopic binary stars [SB2 EBs], astronomers can empirically measure stellar properties such as mass and radius. However, empirical measurements from SB2 EBs suffer from three major problems; there are systematic offsets from the predictions of stellar evolutionary models, large scatter, and outliers that are a factor of 2-to-3 larger than model predictions. Han et al. [2019] demonstrated the combination of space-based photometry and high-resolution near-infrared spectroscopy is pivotal to the accuracy of the inferred EB parameters. I propose to measure radial velocities of component stars of SB2 EBs that are newly discovered by TESS to determine the masses of each component, using IGRINS spectra. The direct outcome of the proposed work includes precisely determined stellar masses and radii of component stars of low-mass SB2 EBs. PROGRAM_ABSTRACT_END