TOI-5375 B: A Very Low Mass Star at the Hydrogen-Burning Limit Orbiting an Early M-type Star
arXiv:2303.16193 · doi:10.3847/1538-3881/acc651
Abstract
The TESS mission detected a companion orbiting TIC 71268730, categorized it as a planet candidate, and designated the system TOI-5375. Our follow-up analysis using radial velocity data from the Habitable-zone Planet Finder (HPF), photometric data from Red Buttes Observatory (RBO), and speckle imaging with NN-EXPLORE Exoplanet Stellar Speckle Imager (NESSI) determined that the companion is a very low mass star (VLMS) near the hydrogen-burning mass limit with a mass of 0.080$\pm{0.002} M_{\Sun}$ (), a radius of 0.1114$^{+0.0048}_{-0.0050} R_{\Sun}$ (1.0841), and brightness temperature of K. This object orbits with a period of 1.721553 days around an early M dwarf star ($0.62\pm{0.016}M_{\Sun}$). TESS photometry shows regular variations in the host star's TESS light curve, which we interpreted as activity-induced variation of 2\%, and used this variability to measure the host star's stellar rotation period of 1.9716 days. The TOI-5375 system provides tight constraints on stellar models of low-mass stars at the hydrogen-burning limit and adds to the population in this important region.
arXiv comment15 pages, 8 figures, Accepted to the Astronomical Journal
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