High precision RV measurements and bisector spans (BIS) for HAT-P-42 (left) and HAT-P-43 (right). Filled circles show OHP 1.93 m/SOPHIE observations, while open triangles show FLWO 1.5 m/TRES observations. The top panels show the RV measurements as a function of orbital phase, along with our best-fit circular orbit model. Zero phase corresponds to the time of mid-transit. The center-of-mass velocity has been subtracted for each system. The middle panels show velocity O−C residuals from the best fit circular orbit model. The bottom panels show the BIS values, with the mean values subtracted. Note the different vertical scales of the panels.