Exoplanet minimum mass m₂ as a functionof orbital frequency and different values of a₁ sin(i) (labeled in AU, orange lines) orbiting a typical sdB mass ~ 0.5 M_⊙. Violet lines represent the values (shown on the right) of the semi-major axes a₂ sin (i) of the exoplanetary orbit corresponding to a₁ sin(i). The top axis shows the exoplanet orbital period. The green line marks the 0.0024 c/d frequency (referred to later in the text).