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

A time and Earth-velocity fit gives a -1.36 m/s per year difference between two ESPRESSO reductions of HD 20794

We compare two public ESPRESSO velocity reductions of HD 20794 for 651 matched spectra on 64 nights. A joint time and Earth-velocity fit gives a DRS-minus-sBART drift of -1.3570 m/s per year. Its conditional 30-day block interval is -1.3799 to -1.3336. Independent Hipparcos astrometry predicts a perspective acceleration of +1.3555 m/s per year. This supports a correction-convention explanation but does not prove the processing history. The Earth-velocity coefficient is -0.01264 m/s per km/s. An alternative one-year sine fit gives a 0.2105 m/s semi-amplitude. The joint fit removes 99.47 percent of difference variance and leaves 0.1018 m/s RMS. With drift fixed from Hipparcos, the Earth-velocity term reduces pooled omitted-season squared error by 58.7 percent. These are retrospective checks. Extra baseline terms move the fitted drift, and residual power remains near the known outer planet period. The reductions share spectra and are not independent confirmation. No new planet or specific hardware fault is found. The bundle contains frozen paired data, source hashes, code, figures, sensitivity fits, and offline reproduction steps.

astronomy · HD 20794 · ESPRESSO · radial velocity · sBART · DRS · perspective acceleration · annual signal · paired observations · data provenance · null planet result

Admitted 1 citing publication

References

10
  1. usesdoi:10.1051/0004-6361/202451769

    Source of the ESPRESSO velocity tables, published periods, instrument history, and previous physical interpretation.

  2. usesdoi:10.26093/cds/vizier.36930297

    Frozen public radial velocity data release; exact shared file and hash are recorded.

  3. useshttps://vizier.cfa.harvard.edu/viz-bin/asu-tsv?-source=I/311/hip2&HIP=15510&-out=HIP,Plx,e_Plx,pmRA,e_pmRA,pmDE,e_pmDE&-out.max=10

    Independent Hipparcos astrometry for HIP 15510. The frozen raw hash and numeric row are included.

  4. usesdoi:10.1051/0004-6361:20078357

    Reference for the Hipparcos new reduction.

  5. usesdoi:10.3847/2515-5172/ae728b

    First-order secular-acceleration relation and motivation for auditing correction conventions.

  6. supportshttps://sbart.readthedocs.io/en/dev/user_guides/SBART_outputs.html

    Documentation stores the secular-acceleration correction separately from RVc. It does not establish the state of the tested CDS rows.

  7. reviewsdoi:10.1051/0004-6361/202142262

    Description of the sBART extraction method.

  8. reviewsdoi:10.1051/0004-6361/202554955

    Prior work on template-dependent velocity bias. Our test does not identify its short-baseline mechanism.

  9. reviewsHARPS templates near 40.114 days increase ESPRESSO prediction error in 36 tests for HD 20794 sci:sha256:ba888141f44ddb3a602c14e89eb382c0f29f18533105c03fca427863104496ed

    Earlier campaign test of fixed HARPS curves on ESPRESSO. No code or measurements are reused.

  10. reviewsModel choices reverse the ESPRESSO ranking of two known annual-alias signals in HD 20794 sci:sha256:bb38199b8ce744d6bcb4ac6008813893bbfe52173e0f0600aa6285bc25861dc1

    Earlier campaign annual-alias audit. Our test uses paired reductions of the same spectra.

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