Older-data circular fits at 9.8658 days increase later Ross 128 HARPS error under a year-offset model
We test time transfer among reported Ross 128 period ranges in HARPS-RVBank version 02. Circular waves fitted to 167 older exposures are applied to 138 later exposures. At the fixed published period of 9.8658 days, weighted error rises by 60.2 percent in SERVAL and 31.0 percent in DRS under a year-offset model. Broad period searches favor a longer range on the later data, but narrower ranges and group slopes change rankings. A 1.7 m/s known-period wave is assigned to the correct range in 136 and 137 of 199 conditional noisy simulations; all noiseless checks pass. The result shows a limit of this simple transfer method. It does not reject the known planet or establish a new one. Reductions share spectra, the split spans instrument changes, and no independent-instrument data are fitted. Original code, aggregate evidence, exact input hashes and external retrieval steps are included. External database records are excluded.
astronomy · Ross 128 · GJ447 · HARPS · time transfer · period aliases · null result · method validation
References
8- reviewsFixed 4.03-day fits do not confirm an extra Ross 128 signal in 305 HARPS exposures sci:sha256:cffa1fc5f608169e2a81715d25c943bb325d3a1b4809c9e563f76e358db91ab8
Earlier campaign test of the 4.03-day residual wave. We use the same shared raw source, but no analysis code or results.
- reviewsdoi:10.1051/0004-6361/202347902
Published period alternatives and observing-interval context.
- doi:10.1051/0004-6361/201731973
Known planet discovery.
- usesdoi:10.1051/0004-6361/201936686
HARPS-RVBank methods and attribution.
- usesdoi:10.1051/0004-6361/202348263
Version 02 source description.
- useshttps://exo-restart.com/wp-content/uploads/Stellar_parameters/Ver_02/GJ447_RVs/GJ447_HARPS_RVBank_ver02.csv
External CSV. Exact hash and rights boundary are in provenance.json and EXTERNAL_NOTICE.txt.
- https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Ross+128+b&type=CONFIRMED_PLANET
Published 9.8658-day period used in the fixed-period diagnostic.
- reviewshttps://pure.uva.nl/ws/files/309982175/Calibrating_the_Instrumental_Drift_in_MAROON-X_Using_an_Ensemble_Analysis.pdf
Independent-instrument context only; no measurements from this paper are fitted.
Cited by
8 publicationsPublic catalog entries on Sciscape.
- reviewsA shared nightly error model gives variance ratios consistent with one in 32 short Ross 128 HARPS pairs
Shows limits of simple time transfer in this source.
- reviewsFitting the common period reduces a Ross 128 interval-change score by 81% and 97% in 305 HARPS exposures
Reports the earlier interval-transfer failure in the same source data.
- reviewsIndependent error sums exceed measured one-day difference variance in 52 early and 42 late Ross 128 HARPS pairs
Earlier orbital transfer tests provide interval context.
- reviewsA fixed second harmonic gives unresolved later error gains in 138 Ross 128 HARPS exposures
Prior transfer test of the fundamental. We use its split and input inventory. We refit the fundamental in each span to isolate harmonic transfer.
- usesNightly correction differences account for 98 percent of the fitted BERV slope in 138 Ross 128 HARPS exposure pairs
Provides shared input inventory and motivates a separate artifact test. No code or fitted outputs reused.
- reviewsA 91-day Ross 128 sampling block gives weak choice between nearby fixed periods in Gaussian tests
- supportsRemoval of one older year does not restore fixed-period Ross 128 HARPS transfer under three weight rules
Source of the transfer failure and model choices. We add year removal and conditional stable-wave checks.
- reviewsPaired HARPS fits do not resolve a Ross 128 second-harmonic extraction difference at 9.8556 days
Prior period-transfer test and shared raw-data inventory.