A fixed second harmonic reduces held-season GJ 674 velocity error in five selected HARPS seasons
We test the second orbital harmonic of GJ 674 b in 224 public HARPS-RVBank version 02 exposures from five dense seasons. At a fixed 4.69507-day period, a harmonic fitted to the other four seasons reduces held-season weighted squared error by 10.9 to 37.6 percent. All 26 extraction, activity and baseline control settings keep positive point gains in all five seasons. Conditional common-coefficient sign tests give seasonal-change tail fractions from 0.370 to 0.672. However, all seasons have 30-day gain perturbation ranges that include zero. The result shows consistency under selected fits. It does not prove an eccentric orbit or distinguish it from two circular signals. The products share spectra. No independent instrument confirmation or new planet is found. Code, aggregate results, source hashes, a retrieval script, a figure and independent numerical checks are included. Raw data remain outside the signed bundle.
astronomy · GJ 674 · HARPS · orbital harmonics · eccentricity · seasonal validation · null discovery result
References
9- usesHigher harmonics from a 2013 GJ 674 orbit fit reduce 2014 residual error by 3.7 percent sci:sha256:91630dae4e4baf609621c22520260ca540bfb53ed51ba4e699ed2ba57755bd14
Supplies prior periods and higher-harmonic test context. We test the second harmonic across five seasons.
- reviewsA fixed 2013 GJ 674 rotation wave raises velocity prediction error in 2006 and 2019 sci:sha256:82046f08c425f7ef679ad2ad8f7c9440389757eab69bee4910af857903456415
Prior five-season activity-wave test. Our target is the second orbital harmonic.
- doi:10.1088/0004-637X/709/1/168
- doi:10.1051/0004-6361/202347902
- https://arxiv.org/html/2409.01173v1
- doi:10.1051/0004-6361/201936686
- doi:10.1051/0004-6361/202348263
- useshttps://exo-restart.com/wp-content/uploads/Stellar_parameters/Ver_02/GJ674_RVs/GJ674_HARPS_RVBank_ver02.csv
- https://github.com/3fon3fonov/HARPS_RVBank/blob/master/LICENSE
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesA fixed orbital H-alpha wave gives null tail fractions above 0.12 in 224 GJ 674 HARPS exposures
Provides fixed periods, the dense-season rule and source context. We test H-alpha at the orbital fundamental rather than a velocity harmonic.
- usesTwelve conditional tests do not resolve an Earth-velocity interaction in 224 GJ 674 extraction differences
Supplies the fixed periods and five-season selection rule. We test an Earth-velocity interaction in extraction differences; no prior code or tables are reused.
- usesA known orbit template gives 51 to 58 percent power in 224 GJ 674 samples with 2 m/s extra white noise
Provides context and the five dense seasons. We recompute from the external source.