Demographics of M dwarf binary exoplanet hosts discovered by TESS
April 2025 • 2025CoSka..55c.263M
Abstract • M dwarfs have become increasingly important in the detection of exoplanets and the study of Earth-sized planets and their habitability. However, 20-30% of M~dwarfs have companions that can impact the formation and evolution of planetary systems. We use high-resolution imaging and Gaia astrometry to detect stellar companions around M~dwarf exoplanet hosts discovered by TESS and determine the separation, magnitude difference, and projected separation for each system. We find 47 companions around 216 M~dwarfs and a multiplicity rate of 19.4+/-2.7% that is consistent with field M~dwarfs. However, the projected separation for close binaries is shifted to larger separations, confirming the lack of close exoplanet host binaries seen in previous studies. %solar-type stars extends to M stars.
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