The CARMENES search for exoplanets around M dwarfs: Nine new double-line spectroscopic binary stars

摘要: Context. The CARMENES spectrograph is surveying ~300 M dwarf stars in search for exoplanets. Among the target stars, spectroscopic binary systems have been discovered, which can be used to measure fundamental properties of stars. Aims. Using observations, we determine orbital and physical nine new double-line by analysing their radial velocity curves. Methods. We use two-dimensional cross-correlation techniques derive velocities targets, are then employed properties. Photometric data from literature also analysed possible eclipses stellar variability, yield rotation periods. Results. Out 342 selected survey, 9 found binaries, with periods ranging 1.13 ~8000 days orbits eccentricities up 0.54. provide empirical minimum masses sample binaries. Absolute estimated mass-luminosity calibrations, between ~0.1 ~0.6 Msol . Conclusions. These increase number known parameters 15%, they lower mass ratios on average.