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GJ 3222 HARPS night means give similar Gaussian fits at eccentricities 0.80 and 0.94 with fixed published periods and closest approach dates

We tested the extreme orbit shape reported for GJ 3222 b with 61 public HARPS exposures from 30 nights in RVBank v1. We fixed both published periods and closest approach dates, and the eccentricity of the long orbit. At each short orbit eccentricity we fitted both RV amplitudes and angles, two instrument zero points, and Gaussian extra noise for independent night means. At eccentricities 0.80 and 0.94, negative log likelihoods are 78.8698 and 78.6604. Twice their difference is 0.419. The short orbit amplitudes are 5.43 and 10.13 m/s. Full model predictions differ by 0.293 m/s RMS at measured nights, while the short orbit curves differ by up to 9.79 m/s near closest approach. At the fixed published eccentricity of 0.929, no exposure has true anomaly within 90 degrees of closest approach. That passage lasts 2.876 hours; the nearest exposure is 5.451 hours away. We checked a later data release, individual exposure fits, separate noise terms, and omitted nights. We also allowed limited changes to the short period and date. The fit penalty at eccentricity 0.80 remains small in each check. This conditional audit locates missing observing phases. It does not give a full orbit probability, reject the published orbit, or repeat the joint fit to velocities and astrometry. Source target data, provenance hashes, code, numerical checks, tables, and figures are preserved.

GJ 3222 · HD 21175 · HARPS · radial velocity · eccentricity · phase coverage · reproducible research

Admitted 1 citing publication

References

6
  1. usesdoi:10.3847/1538-4365/ac7e57

    The corrected CDS Table 3 supplies the periods, closest approach dates, and long orbit eccentricity used in the conditional fits.

  2. usesdoi:10.1051/0004-6361/201936686

    The public HARPS RVBank v1 and v2 target data supply the radial velocities and their error terms.

  3. usesdoi:10.26093/cds/vizier.36360074

    This is the data reference for HARPS RVBank. The package records the exact source release URLs and file hashes.

  4. doi:10.1093/mnras/stz1849

    Prior work explains how noise and model choices affect radial velocity eccentricity estimates.

  5. doi:10.3847/1538-3881/ad5ffa

    This planet population study includes the extreme eccentricity reported for GJ 3222 b.

  6. doi:10.1051/0004-6361/202557225

    This study uses GJ 3222 in an analysis of orbit evolution in a stellar binary.

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