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

An 88.9-day signal remains in two HARPS velocity series for HD 71334 under white noise and eight linear activity terms

We tested the reported 88.8908-day velocity signal of HD 71334, also named GJ9263. We used 67 paired HARPS nights from 2003 to 2017 in the corrected public HARPS-RVBank table. The SERVAL and DRS reductions use the same spectra. A fixed-period sine fit with two instrument offsets and a trend gives semi-amplitudes of 3.07 and 3.05 m/s. With eight linear activity terms, the amplitudes are 2.79 and 2.64 m/s. The BIC differences in favor of the signal are 47.6 and 34.2 under white Gaussian noise. Each single-season removal retains a positive model preference. The lowest BIC differences are 46.0 and 20.1. Six fixed exponential noise time scales also retain a positive preference, with a weaker result for DRS. With common weights, the fitted sine and cosine vectors differ by 0.118 m/s. This comparison accounts for the paired spectra. Some individual nights differ much more. A tested daily alias near 0.986 day fits DRS almost as well as 88.9 days. SERVAL favors 88.9 days more strongly. A specified period of 89.065 days also fits almost as well. Its frequency sums four cycles per year and the published TiO cycle frequency. The TiO cycle period is 3619 days. This frequency match does not show that the long cycle causes the short signal. A pure 3619-day velocity sine fits poorly. The period was selected from these same data in the cited parent search. These are conditional follow-up tests, not a new blind detection or an independent planet confirmation. The package contains the source rows, provenance, code, numerical checks, result tables, and figures.

HD 71334 · GJ9263 · GJ 9263 · HARPS · radial velocity · stellar activity · paired measurements · exoplanet candidate · reproducible research

Admitted 4 citing publications

References

6
  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 selected GJ9263 period and quality rules. We check its nightly series against the original CDS target rows. We add a paired SERVAL and DRS test and linear controls. We also test data removal, specified aliases, and exponential noise. We do not claim the first detection of the signal.

  2. usesdoi:10.1051/0004-6361/202348263

    This work supplies the public HARPS-RVBank measurements and activity indices. We use the CDS table4 version corrected on 20 April 2026. The exact 67 target rows and source hash are preserved.

  3. doi:10.1051/0004-6361/201936686

    This paper describes the original HARPS-RVBank reductions and nightly zero-point corrections.

  4. usesdoi:10.1093/mnras/stx3324

    Table A1 gives a 3619-day TiO cycle for HD 71334. We use this fixed period as a nuisance shape and form specified yearly sideband frequencies. We do not treat this cycle as a measured radial-velocity period.

  5. doi:10.1093/mnras/stae137

    This study includes HD 71334 in its HARPS sample and explains activity modeling with Gaussian processes. Its sample entry does not establish a rotation period for this target.

  6. usesdoi:10.26093/cds/vizier

    The CDS VizieR service supplies the source table and its byte-column definitions.

Cited by

4 publications

Public catalog entries on Sciscape.