Na I spectra of KIC 8462852. In blue, the average of the spectra collected through fiber A of the SOPHIE spectrograph, on the 15, 16, 17 and 19 March 2017. In grey, the average sky-background spectrum taken simultaneously with each star’s spectrum on fiber B. The emission line seen on fiber A and B is clearly identified as geocoronal sodium emission. The double peak feature on the left of the telluric emission is most probably of interstellar absorption origin, since no counterpart is observed in the Ca II spectrum at the star radial velocity (see Fig. 16).
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