Skip to main content

Research Repository

Advanced Search

The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves

Maxted

The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves Thumbnail


Authors



Abstract

Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars' masses and radii are difficult using other techniques. Within the potential of M-dwarfs to be exoplanet host stars, the accuracy of theoretical predictions of their radius and effective temperature as a function of their mass is an active topic of discussion. Not only the parameters of transiting exoplanets but also the success of future atmospheric characterization relies on accurate theoretical predictions. We present the analysis of five eclipsing binaries with low-mass stellar companions out of a subsample of 23, for which we obtained ultra-high-precision light curves using the CHEOPS satellite. The observation of their primary and secondary eclipses are combined with spectroscopic measurements to precisely model the primary parameters and derive the M-dwarfs mass, radius, surface gravity, and effective temperature estimates using the PYCHEOPS data analysis software. Combining these results to the same set of parameters derived from TESS light curves, we find very good agreement (better than 1 percent for radius and better than 0.2 percent for surface gravity). We also analyse the importance of precise orbits from radial velocity measurements and find them to be crucial to derive M-dwarf radii in a regime below 5 percent accuracy. These results add five valuable data points to the mass-radius diagram of fully convective M-dwarfs.

Citation

Maxted. (2022). The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves. Monthly Notices of the Royal Astronomical Society, 519(3), 3546–3563. https://doi.org/10.1093/mnras/stac2565

Acceptance Date Sep 12, 2022
Publication Date Sep 12, 2022
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 519
Issue 3
Pages 3546–3563
DOI https://doi.org/10.1093/mnras/stac2565
Keywords binaries: eclipsing; stars: fundamental parameters; stars: low-mass; techniques: photometric; techniques: spectroscopic
Publisher URL https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stac2565/6696393

Files






You might also like



Downloadable Citations