Three frozen HARPS curves reduce HD 32564 velocity scatter from 4.33 to 2.77 m/s on 25 ESPRESSO nights
We test reported HD 32564 HARPS velocity curves with 25 released ESPRESSO observations on 25 nights in 2023-2025. We carry over the full-precision periods, amplitudes, phases and eccentricities of three source curves near 2.56, 11.06 and 23.61 days. Only one instrument offset and extra white noise are fitted in the main comparison. The fixed prediction reduces residual RMS from 4.327 to 2.774 m/s. Its descriptive likelihood score is D=22.254 and a fitted common signed scale is 1.066 +/- 0.177 with conditional uncertainty. Separate signed scales are 1.373, 0.766 and 0.437. The first two source components contribute more clearly than the third at its frozen phase. The total improvement survives individual-night omissions, tested offsets and selected correlated-noise models. A HARPS-only local circular parameter-covariance calculation gives some plausible source draws that do not improve the forecast. The record contains unchanged public CCF files, selection and source hashes, code, results, figures, numerical controls and an independent computational review. These independent-instrument observations support conditional velocity correspondence. They do not confirm planets, exclude stellar activity or establish discovery priority.
HD 32564 · ESPRESSO · HARPS · radial velocity · exoplanet candidates · independent observations · forecast uncertainty
References
5- 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
We transfer its original full-precision HD 32564 Keplerian curves to independent ESPRESSO data.
- usesJoint Gaussian fits to 193 HARPS nights support a 2.557-day period for HD 32564 over eight tested daily aliases sci:sha256:6fd673935bf711c004bcda630af649b88903c6c56049f6dd00cd98a53f5e6260
We reuse its preserved HARPS nightly data, original signal parameters and refined circular source models for forecast sensitivity.
- Three fixed velocity periods improve HD 32564 predictions in all six omitted seasons under 13 noise models sci:sha256:b9d305fc6a777050f534151d365e53fc13f3b656d61646654814f79a17b1d4ec
Earlier conditional season checks used the same HARPS spectra; the present test uses independent ESPRESSO observations.
- usesdoi:10.1051/0004-6361/202038306
ESPRESSO instrument description and performance reference.
- usesdoi:10.1051/0004-6361/202348263
Original HARPS-RVBank v2 measurements underlying the cited source studies.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- supportsIndependent RVs reject 13 of 25 testable HARPS-RVBank v2 candidates (3 if HARPS errors double) and agree with a 19.7-day HD 111232 signal, with linear-trend nuisance models
HD 32564 with the same 25 ESPRESSO nights: three fixed HARPS curves (2.56, 11.06, 23.61 d) reduce the RMS from 4.327 to 2.774 m/s, with scales 1.373, 0.766 and 0.437. Our alpha values are 0.96, 0.81 and 0.33. Both find that the 23.61-d curve agrees least. Our HD 32564 result is not independent of this work, because both use the same spectra.
- usesThree fixed HARPS curves show no detected blue to red velocity difference in 25 ESPRESSO nights of HD 32564 under independent nightly errors
We use its 25-night ESPRESSO sample, 30 CCF products, source curve parameters, and archive records. We add separate blue and red velocities and a paired wavelength test.
- usesHD 32564 forecasts favor 2.5566 days over eight local aliases on 25 nights under circular signals and Gaussian noise
We use its 25 selected ESPRESSO nights, native CCF files, and archive metadata. We extend its earlier fixed-curve and one-alias tests.
- usesUVES, HIRES and ESPRESSO give a smaller fixed 68-day GJ 1 amplitude under the tested Gaussian noise models
We adapt its public ESPRESSO DataLink and CCF acquisition code for GJ 1. We retain separate exposure CCFs from a coadded spectrum and record all source files and hashes.