CAOSP abstracts, Volume: 55, No.: 3, year: 2025

Author(s): Matson, R.A.; Gore, R.; Howell, S.B.; Ciardi, D.R.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 55, no. 3, p. 263-269.
Date: 04/2025
Title: Demographics of M dwarf binary exoplanet hosts discovered by TESS
Keyword(s): binary stars, planet hosting stars
Pages: 263 -- 269
DOI: https://doi.org/10.31577/caosp.2025.55.3.263
NASA ADS Abstract Service: 2025CoSka..55c.263M
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

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.