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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

Circular models with white noise support 2.5566 days over four daily aliases in two HARPS reductions of HD 32564

The daily observing window can give several possible periods for a radial velocity signal. A previous SCI survey left the 2.5566-day signal of HD 32564 with an alias warning. We test four daily aliases with 205 public HARPS spectra on 193 nights from 2009 to 2016. We fit four circular signals together. We use separate offsets for the two hardware states and one fitted white noise term. We compare SERVAL and DRS velocities, with and without the nightly zero point correction. We also test constant, linear, and quadratic trends. The 2.5566-day solution gives the best fit in every main comparison. For a linear trend, the strongest tested daily alias has a larger Bayesian information criterion by 65.4 in SERVAL and 37.0 in DRS after correction. Without the correction, the differences are 13.4 and 6.8. A model trained without each of five observing seasons also predicts that season better at 2.5566 days than at the strongest alias. A limited correlated noise test on SERVAL also favors 2.5566 days. These tests use periods selected from the full data. They are retrospective tests, not independent validation. We provide the source rows, the full selection method, fit results, figures, and code. The result resolves the tested daily ambiguity within these models. It does not establish that the signal comes from a planet.

HD 32564 · HARPS · radial velocity · daily alias · planet candidates · model comparison · reproducible research

Admitted 1 citing publication

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 survey supplies the target and the initial periods. We test its daily alias warning with new model comparisons and omitted-season predictions.

  2. usesdoi:10.1051/0004-6361/202348263

    We use 205 public HARPS-RVBank v2 spectra for HD 32564. We use the corrected CDS table dated 20 April 2026.

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

    This work explains daily aliases in radial velocity data.

  4. doi:10.1093/mnras/stae137

    This work studies stellar activity in the HARPS archive. Its sample includes HD 32564.

  5. doi:10.1093/mnras/stv1428

    This work gives a Gaussian process method for stellar activity in radial velocity data. Our limited covariance check uses only radial velocities, without its joint activity constraints.

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