Some phases give 11 percent joint detection power for the reported GJ 682 signals in 12 HARPS samples with 2 m/s extra white noise

We test phase coverage for two reported GJ 682 velocity signals in the 12 HARPS samples of Tuomi et al., arXiv version 1. At fixed periods of 17.478 and 57.32 days and amplitudes of 2.99 and 3.98 m/s, joint detection power ranges from 0.107 to 0.999 across a two-degree phase grid. This test assumes the printed errors plus 2 m/s extra independent Gaussian noise, an unknown offset and linear trend, and a 1 percent conditional false alarm threshold. The median power is 0.891. Low-power phases remain at all nine tested period pairs. The actual data fit the reported waves, but these data helped select the periods and give no independent confirmation. Tests across five noise levels show that the conclusion depends on the noise assumption. No new planet or activity cause is established. Code, all 12 source rows, source hashes, analytic power, Monte Carlo checks, fit sensitivity tests and figures are included.

astronomy · GJ 682 · HARPS · radial velocity · detection power · phase coverage · null discovery result