The search of Barnard b in TESS S80 photometry. (a) Mean time-window detrended SAP photometry with superimposed predicted times of inferior conjunction through GH24 ephemerides. The median expected transit width is displayed as dark blue bands. The propagated ephemeris uncertainty is shown as light blue bands. (b) Phase-folded plot at GH24 ephemerides: before and after applying a 5 min binning (light hollow and dark filled circles, respectively). The inferior-conjunction epoch uncertainty is shown as a light blue band. We compare photometry against the expected transit curve of Barnard b for three impact-parameter values: b = 0.0 (black dotted line), b = 0.9 (black dashed line), and b = 1.0 (black solid line). (c,d) GLSP of unbinned data before and after iterative 4σ clipping. (e,f) BLSP of unbinned data before and after iterative 4σ clipping.