Hot subdwarfs in close binaries observed from space

Context. About a third of the hot subdwarfs spectral type B (sdBs), which are mostly core-helium-burning objects on extreme horizontal branch, found in close binaries with cool, low-mass stellar, substellar, or white dwarf companions. They can show light variations due to different phenomena. Aims. Many now have space-based curves high signal-to-noise ratio available. We used from Transiting Exoplanet Survey Satellite and K2 space mission look for more sdB binaries. Their be study subdwarf primaries their companions, obtained orbital, atmospheric, absolute parameters those systems, when combined other analysis methods. Methods. By classifying combining these fit energy distribution, distance derived by parallaxes Gaia , atmospheric parameters, mainly literature, we could derive nature secondaries 122 (75%) known 82 newly reflection effect systems. masses, radii, luminosities total 39 as well 29 sdBs Results. The mass distribution stellar substellar differs implying they come populations. comparing period minimum companion distributions, find that systems all M brown there seem several populations – one masses around 0.4 ⊙ longer periods up 0.6 at shortest period, another 0.8 . also first orbital selected instead radial velocity variations. It shows narrower 1.5 h 35 h, compared dwarfs, ranges 1 30 days. These distributions constrain previous common-envelope phase.