Relative stellar occurrence of exoplanets in habitable zones of the main sequence F, G, K stars

We have determined the stellar occurrence of exoplanets in the habitable zones of the main sequence F, G, K stars using the statistical analysis of confirmed exoplanets and that of the Kepler candidates. We predict the greatest occurrence of exoplanets in the habitable zones of the main sequence G stars. An optimistic definition of habitable zone gives 0.114 Earth-size exoplanets per star in habitable zones of the main sequence G stars for the confirmed exoplanets and 0.336−0.041−0.032 Earth-size exoplanets per star in habitable zones of the main sequence G stars for the Kepler candidates. The possibility of detecting habitable exoplanets is much higher for the star from the main sequence G stars, the exoplanet detection missions can be focused in the region around the stars of this spectral class.