Combined TESS data recover 95.3 to 100% of added circular transits from planets of 1.5 to 2.5 Earth radii on a fixed HD 40307 g grid

We measured phase coverage and added-signal recovery for the disputed radial velocity candidate HD 40307 g. We used 17 later TESS SPOC light curves from 2023 to 2026 and 42 combined light curves from 2018 to 2026. The combined set has 684,720 accepted 120-second samples. We tested 32 periods from 188.8 to 203.5 days, 512 phases, three impact parameters, and four radii per data set. The assumed star has 0.77 solar masses and 0.72 solar radii. Added signals have circular orbits and fixed limb darkening. Recovery requires two accepted event windows and a corrected repeated-box score of at least 8. Signals from planets of 1.5 to 2.5 Earth radii pass this rule at 64.26 to 75.00% of tested phases in the later data and 95.31 to 100% in the combined data. The weakest combined coverage is at 190.3 days. At the nominal 197.8-day period, all 512 combined phases recover these larger radii. A later-data peak at 194.77 days has score 9.32; an earlier flux increase at its fixed phase lowers the combined score to 6.34. The combined-data maximum has score 8.92 at 198.69 days, but one of its three event windows has depth consistent with zero. We do not claim a planet detection. Fractions apply to the finite grid, fixed star, and additions to released flux. They are not calibrated exclusion confidence or upstream pipeline completeness. The package preserves all required source columns, hashes, code, results, figures, and repeat instructions.

HD 40307 · TESS · transits · phase coverage · signal recovery · public data · HD 40307 g