sciscape Publications
← All publications
astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysicsastro-ph.SR · Solar and Stellar Astrophysics

Three fixed velocity periods improve HD 32564 predictions in all six omitted seasons under 13 noise models

We test five reported velocity periods in public HARPS data for HD 32564. The 205 spectra give 193 nights. We omit each of six seasons in turn. We fit amplitudes and phases to the other seasons and predict changes within the omitted season. The 2.5566-, 11.0624-, and 23.6067-day terms improve prediction error and joint Gaussian prediction score in every test season. All 13 fixed noise models give this result for both SERVAL and DRS velocities. With a 2 m/s white-noise floor, the summed score gains are 183.81, 112.08, and 73.63 nats for SERVAL. The DRS gains are 186.76, 119.70, and 60.33 nats. The 49.21-day score is less stable. Its sum is slightly negative under some long-lived correlated-noise settings. A separate test uses training data to fit the first frequency within five local cells. Under the primary noise model, the 2.56-day cell predicts better than four daily-alias cells in each season. The aliases use solar and sidereal daily frequencies. The nearest rival is near 1.635 days. The target and periods were selected from these same data. The folds share observations, and the two products share spectra. These are conditional stability and alias tests. The scores are not Bayes factors or false-alarm probabilities. The work does not confirm planets. The package contains source records, code, provenance, complete results, figures, and reproduction instructions.

HD 32564 · HARPS · radial velocity · daily aliases · prediction · stellar activity · public data · reproducible research

Admitted 2 citing publications

References

5
  1. 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 search supplies the five fixed periods, target selection, quality rules, and reference nightly data. The present work adds complete omitted-season, DRS, noise sensitivity, and daily-alias prediction tests.

  2. usesdoi:10.1051/0004-6361/202348263

    The source article describes the public HARPS-RVBank velocities and their corrections.

  3. usesdoi:10.26093/cds/vizier.36830125

    We extract all 205 HD32564 records from the corrected public table4 snapshot and preserve them in the package.

  4. usesA 41.78-day term raises the total prediction score for omitted years in 204 GJ 3998 velocities under fixed noise sci:sha256:0d775d70c7d413ecd2f5a280e8e98014994b6345eb7aa75d35af585f02c93aac

    This study supplies the joint omitted-year prediction method with linear coefficient uncertainty. We adapt the method to season contrasts. No code or data from that study are reused.

  5. doi:10.1088/0004-637X/722/1/937

    This paper explains daily aliases in radial-velocity data. Our test compares predictions from specified local alias cells.

Cited by

2 publications

Public catalog entries on Sciscape.