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

Nine Gaussian models for 71 HIRES nights exclude the fixed 20.389-day HARPS amplitude of HD 4915 at 95% confidence

We test whether a reported HARPS velocity curve of HD 4915 repeats in independent HIRES data. The source period is 20.388805 days and its amplitude is 3.646 m/s. We hold its phase, eccentricity, and orientation fixed. The 2025 HIRES release gives 89 spectra on 71 nights. With an offset, a trend, and a Gaussian covariance shape with one fitted common scale, the signed curve amplitude is 0.927 m/s. Its conditional 95% interval is -0.842 to 2.695 m/s. All nine specified all-night noise and nuisance models include zero and exclude the fixed source amplitude at 95% confidence. A 62-night activity-index check gives the same outcome. The older 45-night release gives a weaker constraint. The releases share 63 spectra and are fitted separately. A unit audit shows that numerical velocities in the 2025 CDS tablea1 are in m/s, although its ReadMe labels them as km/s. Shared raw velocities have slope 1.000231 between releases, with small revisions. Free phase limits the conclusion: a circular sinusoid at the source period has a conservative 95% amplitude bound of 4.186 m/s in the primary model. Thus this test weakens the fixed HARPS curve, but does not exclude all planets near this period or identify stellar activity as the cause. All intervals assume the stated Gaussian shapes. Source orbit uncertainty is not integrated. We preserve target rows, hashes, plans, code, model matrices, simulations, results, and figures for reproduction without network access.

HD 4915 · radial velocity · HIRES · HARPS-RVBank · planet candidate · independent data · stellar activity · data provenance

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

    We test its HD 4915 candidate with independent HIRES data. We use its frozen HARPS series, both final orbit records, and unchanged orbit code for a convention check. The source reports a candidate, not a confirmed planet.

  2. usesdoi:10.1093/mnrasl/sly227

    The corrected 2019 HIRES release supplies 63 target spectra. It also permits a numerical unit and overlap check against the newer release.

  3. usesdoi:10.1051/0004-6361/202555034

    The updated HIRES release supplies 89 target spectra. We test the fixed candidate curve and check the tablea1 velocity units against its paper and shared spectra.

  4. doi:10.1051/0004-6361/202452023

    This study measures HD 4915 rotation and activity cycles. It motivates activity and covariance checks without proving an activity origin for the tested velocity signal.

  5. usesdoi:10.1051/0004-6361/202348263

    HARPS-RVBank v2 is the original source of the derived HARPS nightly series used by the cited SCI search.

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