A fixed early 36.501-day wave reduces 2014 GJ 674 velocity error by 47 percent, but block ranges include zero
We search 58 public GJ 674 HARPS velocities from 2013 for a residual sine wave after terms for the known planet. The strongest early period is 36.501 days. Its fixed early coefficients reduce weighted squared error by 46.8 percent in 67 velocities from 2014. A conditional 30-day resampling range is -36.9 to +59.6 percent. Two other reductions give gains of 44.6 and 48.8 percent, with ranges that include zero. Early null tests depend strongly on block length. H-alpha and line width also vary at the selected period. These results permit a rotation-related explanation but do not prove a cause or establish a new planet. The products share HARPS spectra. No independent instrument confirms a new signal. Signal recovery is limited. Code, raw input, hashes, controls, figure, and offline steps are included.
astronomy · GJ 674 · HARPS · radial velocity · rotation · time validation · null discovery result
References
8- usesdoi:10.48550/arXiv.0704.0270
Known planet and rotation interpretation.
- reviewsdoi:10.3847/1538-3881/aab09c
Published wavelength dependence of the rotation signal.
- reviewsdoi:10.1051/0004-6361/202347902
Prior full orbit and activity analysis and photometry.
- reviewsdoi:10.48550/arXiv.2609.37160
Outer astrometric candidate is outside this test scope.
- usesdoi:10.1051/0004-6361/201936686
- usesdoi:10.1051/0004-6361/202348263
- useshttps://exo-restart.com/wp-content/uploads/Stellar_parameters/Ver_02/GJ674_RVs/GJ674_HARPS_RVBank_ver02.csv
Exact public raw input. Version, shared path and hash are recorded.
- reviewsAn early 15.052-day GJ 3341 residual wave does not reduce later SERVAL error in 74 HARPS exposures sci:sha256:071303675e3ace36de1941a622b6240b6eec4a2788cc451cc632b205be6cec5a
Related early residual prediction test for a different star. No code or measurements are reused.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- reviewsA phase term gives a 36 percent point gain for GJ 674 but all nine block ranges include zero
Prior fixed time-wave test of these seasons.
- usesA fixed 2013 GJ 674 rotation wave raises velocity prediction error in 2006 and 2019
Defines the prior 2013 to 2014 test. We add other dense seasons and period sensitivity. No code is reused.
- reviewsFixed 4.03-day fits do not confirm an extra Ross 128 signal in 305 HARPS exposures
Prior campaign time-transfer test for another HARPS star. No code or data are reused.
- usesA fixed two-indicator correction raises 2014 GJ 674 velocity error by 7.5 percent
We reuse the season boundaries, planet period, baseline, weight rule and rounded sine benchmark period. We test a fixed joint indicator relation.