Circular HARPS SERVAL models with 10 m/s extra independent Gaussian night noise limit three nominal GaiaPMEX companions to inclinations below 5 degrees
We compare approximate companion masses and semi-major axes from the GaiaPMEX catalog with corrected public HARPS-RVBank v2 velocities. Our stated matching and sampling rules give 14 targets with at least 20 nights over at least three years. We report every match and fit. We test circular orbits at fixed catalog mass and distance, with a free phase, separate instrument offsets, and a free linear slope. A bound that encloses the joint coefficient confidence ellipse gives conservative pointwise 95% amplitude limits under a specified Gaussian noise model. With 10 m/s of extra independent noise per night and a residual noise scale floor, the nominal configurations for HD 13808, HD 88725, and HD 134702 have amplitude bounds of 2.87, 5.88, and 11.77 m/s. Their inclination bounds are 2.17, 2.70, and 4.43 degrees. Fixed exponential noise tests with 20 m/s amplitude and time scales of 30 or 365 days weaken these bounds to about 8 to 15 degrees. A paired-extraction audit finds one HD 13808 DRS velocity that differs by about 25.2 km/s and has an unusual fitted line profile. We preserve that exposure, report the unfiltered DRS result, and label the effect of an exploratory removal rule. These results test nominal circular configurations. They do not confirm companions or exclude eccentric orbits. The package contains source rows and hashes, all matches, code, result tables, figures, noise tests, and reproduction instructions.
GaiaPMEX · HARPS-RVBank · radial velocity · circular orbits · companion constraints · HD 13808 · HD 88725 · HD 134702 · data provenance · noise covariance
References
8- usesdoi:10.1051/0004-6361/202451745
GaiaPMEX Table B.1 supplies the approximate companion masses, semi-major axes, stellar masses, and host identifiers that define the tested configurations.
- usesdoi:10.1051/0004-6361/202348263
The corrected CDS Table 4, dated 20 April 2026, supplies the HARPS SERVAL and DRS velocities and line diagnostics.
- doi:10.1051/0004-6361/201118651
Prior HARPS circular companion limits for metal-poor stars provide context for the fixed-orbit test.
- doi:10.1051/0004-6361/201527522
Prior analysis of HD 88725 establishes that its small velocity scatter and long-term trend were already known.
- doi:10.1093/mnras/stab373
Prior HD 13808 analysis identifies two small planets and shows the need to model stellar activity.
- doi:10.1051/0004-6361/200913616
The known eccentric planet of HD 28254 illustrates why a circular bound is not a general companion exclusion.
- doi:10.1051/0004-6361/202346612
A later eccentric orbit and astrometry study of HD 28254 provides context for the limits of a circular test.
- A 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
Related SCI work reports a blind Keplerian search of HARPS-RVBank v2. This study instead tests fixed configurations from GaiaPMEX. No code or numeric results are reused.
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