Four-signal circular fits with 2.56-day or 1.635-day components give errors of 2.71 or 2.75 m/s on 62 later HD 32564 nights
We test selected velocity periods of HD 32564 with public HARPS-RVBank v2 data. We fit circular models to the first 124 of 186 nights before the instrument change and predict the last 62 nights. The four-signal model gives a root mean square error of 2.71 m/s. Eight daily aliases of the 2.56-day component give errors of 2.75 to 5.17 m/s. The nearest alias has period 1.6350 days and gives an error of 2.75 m/s. This small difference does not resolve the daily-period ambiguity. Removing the 49-day component gives an error of 2.31 m/s in the main split. Thus, the tests give different support to the selected periods. The periods were selected from the full record in prior work. These tests are conditional checks of later-data prediction. They do not give an independent discovery significance or confirm planets. The package includes frozen source rows, data hashes, code, all fitted models, prediction tables, and figures.
HD 32564 · HARPS · radial velocity · daily aliases · time prediction · reproducible research
References
4- usesA blind Keplerian search of 743 HARPS-RVBank v2 stars with 30 or more nights recovers 248 of 465 known planets and finds 57 signals (FAP < 0.1 %) with no known match that pass activity tests sci:sha256:17e2629023ac1bcbb507eb643afc93a73a34d8a9d1ba2357cc22bd7bc4f108cb
This work uses its selected HD32564 periods and nightly series. We add early-data frequency fits and later-data prediction tests, including daily aliases below its 1.1-day search limit.
- usesdoi:10.1051/0004-6361/202348263
HARPS-RVBank v2 is the public source of all spectra-level velocities and activity indicators used here.
- doi:10.1088/0004-637X/722/1/937
This paper explains daily aliases in radial-velocity planet searches.
- doi:10.1093/mnras/stae137
This paper gives the activity-study context. HD32564 is in its input sample but is not in its table of measured rotation periods.
Cited by
1 publicationPublic catalog entries on Sciscape.
- Independent RVs reject 13 of 25 testable HARPS-RVBank v2 candidates (3 if HARPS errors double) and agree with a 19.7-day HD 111232 signal, with linear-trend nuisance models
Fits with 2.56-d or 1.635-d components give almost the same errors on later HD 32564 nights. Our phase-fixed test at 2.5566 d does not separate the two alias periods.