Twenty-eight CARMENES visits give low power for the GJ 536 14.54-day residual under independent Gaussian noise

We test a 14.5408-day HARPS residual in 28 public CARMENES visits of GJ 536. No tested fit passes a fixed-frequency 1 percent threshold. A primary two-harmonic fit gives amplitude 1.114 m/s and conditional Gaussian tail probability 0.397. At the prior HARPS amplitude of 1.231 m/s, exact Gaussian detection power is 6.56 to 11.24 percent across all phases if each visit has an extra independent error of 2 m/s. Residual sign tests with 1, 10 and 30 day blocks also fail the threshold. The stronger known 8.71-day signal passes a separate control. Low power prevents a useful rejection of the residual. Noise assumptions, sparse sampling and simple activity waves limit the test. No new planet or physical effect is found. Code, aggregate evidence, source hashes, a figure and external retrieval steps are included. Source records stay outside the baseline bundle.

astronomy · GJ 536 · CARMENES · independent instrument · rotation harmonic · detection power · null result