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

• DOI: 10.1093/mnras/stac2565
• Publication Date: 2022-09-08T21:03:13Z
• Authors: D Sebastian; M I Swayne; P F L Maxted; A H M J Triaud; S G Sousa; G Olofsson; M Beck; N Billot; S Hoyer; S Gill; N Heidari; D V Martin; C M Persson; M R Standing; Y Alibert; R Alonso; G Anglada; J Asquier; T Bárczy; D Barrado; S C C Barros; M P Battley; W Baumjohann; T Beck; W Benz; M Bergomi; I Boisse; X Bonfils; A Brandeker; C Broeg; J Cabrera; S Charnoz; A Collier Cameron; Sz Csizmadia; M B Davies; M Deleuil; L Delrez; O D S Demangeon; B-O Demory; G Dransfield; D Ehrenreich; A Erikson; A Fortier; L Fossati; M Fridlund; D Gandolfi; M Gillon; M Güdel; J Hasiba; G Hébrard; K Heng; K G Isaak; L L Kiss; E Kopp; V Kunovac; J Laskar; A Lecavelier des ...; M Lendl; C Lovis; D Magrin; J McCormac; N J Miller; V Nascimbeni; R Ottensamer; I Pagano; E Pallé; F A Pepe; G Peter; G Piotto; D Pollacco; D Queloz; R Ragazzoni; N Rando; H Rauer; I Ribas; S Lalitha; A Santerne; N C Santos; G Scandariato; D Ségransan; A E Simon; A M S Smith; M Steller; Gy M Szabó; N Thomas; S Udry; V Van Grootel; N A Walton
• Keywords: Surface gravity; Effective temperature; Radial velocity

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