Erratum: The co-existence of hot and cold gas in debris discs (Astronomy and Astrophysics (2018) 614 (A3) DOI: 10.1051/0004-6361/201732329)

Due to a bad correction of telluric lines some Na I absorptions detected towards some stars were not mentioned in the original paper. This corrigendum presents a proper telluric subtraction, carried out with MOLECFIT1 (Smette et al. 2015, Kausch et al. 2015). Tables 3 and 4 from the original paper are rectified below with the corrected Na I absorptions shown in boldface text. Figure 4 of the original paper showed an incorrect plot of the Na I D line features observed towards HD 138813. Figure 1 is the corrected version of the original paper s Fig. 4. Below we summarize the corrected Na I absorptions of each concerned star: - HD 9672: the Na I D absorption at 11.5 km s1 coincides with the Ca II feature and the radial velocity of the ISM. - HD 131488: besides the already reported non-photospheric absorptions at 5.3 km s1, a Na I D2 feature at -13.9 km s1 is detected. A similar feature is detected towards field stars and most likely has an interstellar medium origin. - HD 138813: two new non-photospheric features are detected in the Na I D lines (see Fig. 1). The approximately 22.2 km s1 absorption is close to the Ca II K nonphotospheric absorption and the G ISM cloud; thus, an interstellar origin is more plausible. A feature in emission at 0.1 km s1 is detected in both Na I D lines at the radial velocity of the star; this feature is related to the star. (Figure Presented).