Constraints on companion mass and semi-major axis for planets orbiting around L 363-38, based on the ESPRESSO residuals after subtracting the signal from the planet. The 2D histogram shows the percentage of companions with mass and semi-major axis in a given bin which would be detected with the current ESPRESSO observations, if present. The dashed orange vertical lines indicate the limits of the HZ computed following Kopparapu et al. (2013, 2014, method 1 in Fig. 4; see text for details).