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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.SR · Solar and Stellar Astrophysics

A shared 89.023-day sine fits 99 HD 71334 nights under white noise, but HIRES has competing periods

We tested the reported 88.9-day radial velocity signal of HD 71334 with public HARPS and HIRES data. The input rows match new downloads of both full CDS catalogs. We fit separate instrument offsets, trends, and Gaussian white-noise scales. A common sine for 67 HARPS and 32 HIRES nights has a local period of 89.023 days and semi-amplitude of 3.115 m/s. The nominal local 95% period interval is 88.920 to 89.126 days. With a fitted common period, separate instrument sine vectors improve twice the log likelihood by only 0.21 for two extra coefficients. HIRES alone has competing refined peaks near 70.25 and 89.21 days, separated by 2.89 in twice the log likelihood. In 2048 Gaussian trials per noise level, a fixed-weight search recovers an injected HARPS 88.8908-day sine in only 33.35% or 16.70% of trials at the actual HIRES times. A proposed 89.065-day activity sideband remains inside the local joint interval. The target was selected after an earlier positive fixed-curve HIRES result. These are exploratory, conditional model tests. The physical source remains unknown; no planet is confirmed. Exact source extracts, code, provenance, all fit results, and figures are preserved.

HD 71334 · GJ9263 · radial velocities · HIRES · HARPS · exoplanet candidates · stellar activity · period aliases · signal recovery · reproducible astronomy

Admitted 1 citing publication

References

10
  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 selected the source candidate and its 88.8908-day period.

  2. usesThree of 12 fixed HARPS candidate curves have lower HIRES amplitudes in a block residual test sci:sha256:c6868b65a79bdeaf7f316721fd4d1fbffdd86a513ad091f02f687f4af45ad97f

    This source supplied the initial HIRES catalog and unit-control row. Its positive fixed-curve result informed target selection. We add free phase, period tests, and a common-period fit.

  3. usesAn 88.9-day signal remains in two HARPS velocity series for HD 71334 under white noise and eight linear activity terms sci:sha256:3188dc3410f44688cad9b9b0a29d582778832398e0f0e5670a2e1ed4eb7958f3

    This study supplied exact HARPS target rows, the parsed table, and provenance. It already tested HARPS activity, reductions, and aliases.

  4. An 88.9-day sine model fits 67 HARPS velocities of GJ 9263 better than a quarter-year model with fixed noise sci:sha256:b5661f7836d0a64b4f7b57f2f1dbf36c8dd5ae1628f59dc2d09c5b2875e21858

    Earlier HARPS test of the quarter-year alternative for the same target.

  5. An 88.9-day model gives lower total season prediction error than a quarter-year model for 67 HD 71334 spectra under fixed white-noise weights sci:sha256:19fde09d7281f043f2a68f812da3d20b2ef100dcab60a47446ccce7a73a4b341

    Earlier HARPS season prediction test for the same target.

  6. usesdoi:10.1051/0004-6361/202348263

    Original public HARPS-RVBank v2 source velocities and activity indices.

  7. usesdoi:10.1051/0004-6361/202555034

    Original updated HIRES catalog of velocities and activity indices. We verify the exact selected rows against CDS.

  8. doi:10.1093/mnras/stx3324

    Published 3619-day TiO cycle used in the numerical sideband proposed by the earlier HARPS study.

  9. doi:10.1093/mnras/stae137

    Prior stellar-variability study that includes HD 71334 in archival HARPS data.

  10. doi:10.1093/mnrasl/sly227

    HIRES instrumental correction method used by the source catalog.

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