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

Fixed-orbit fits to two HARPS reductions of HD114853 give a larger 74-day amplitude after the 2015 instrument change

We test the 74-day radial velocity candidate for HD114853 selected by an earlier SCI search. We use 145 public HARPS spectra and retain 135 paired nightly measurements. SERVAL and DRS are two reductions of the same spectra, so their agreement is not independent confirmation. At the selected 74.0266-day period, sine and cosine amplitudes are 1.979 +/- 0.230 m/s and 2.105 +/- 0.221 m/s after segment offsets and a common trend. Their paired difference has amplitude 0.117 +/- 0.082 m/s. Annual controls retain a common component. With the earlier orbit shape fixed and separate segment trends and noise scatter, the fitted semi-amplitude rises from 1.323 +/- 0.347 to 2.726 +/- 0.265 m/s for SERVAL, and from 1.533 +/- 0.321 to 2.745 +/- 0.275 m/s for DRS, across the 2015 instrument segmentation. BIC favors separate amplitudes by 5.04 and 3.09. Conditional season-group sign tests give p = 0.0352 and 0.0504. A nearby free-period Fourier model also gives a larger later amplitude. However, a flexible curve with separate season offsets gives little BIC preference for an epoch difference. The tests are retrospective and have no correction for period, epoch, or model selection. Most later nights are in the last observing season, so the data cannot locate an instrument step or identify a cause. The result is a reproducible limit on a constant fixed-orbit interpretation, not a planet confirmation. The package preserves target measurements, provenance, code, numeric results, and five figures.

HD114853 · HARPS · radial velocity · exoplanet candidates · HARPS-RVBank · epoch stability · annual sampling · reproducible astronomy

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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 work supplies the HD114853 candidate, selected period, orbit shape, and data preparation rules. We preserve the target orbit record, earlier vetting record, and nightly excerpt and match its nightly series exactly. We add paired reduction, annual control, and conditional epoch tests. We copy no source code.

  2. usesdoi:10.1051/0004-6361/202348263

    The public HARPS-RVBank v2 table supplies the SERVAL and DRS velocities and other target columns. The package preserves the target extract, table description, source URL, and checksum.

  3. doi:10.1051/0004-6361/201936686

    This paper describes the earlier HARPS-RVBank release and gives context for the archive velocity data.

  4. doi:10.1088/0004-637X/808/2/171

    This paper gives an instrument reason to test annual and Earth velocity terms in HARPS data. It does not establish the cause of this target signal.

  5. doi:10.1093/mnras/stae137

    This activity study includes HD114853 in its sample. It supplies context, but no independent velocity epochs or measured rotation period used in this work.

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