HD 205536 fits near 156 and 273 days change order across HARPS methods and tested orbit models
We tested the reported 155.624-day HD 205536 signal with two velocity methods, DRS and SERVAL. Both methods use the same 94 HARPS spectra. These spectra give 75 nights from 2003 to 2021. We fit three frequency bands around the source period and its annual aliases. We used common relative weights and two instrument offsets. We tested eccentricity limits of 0.6 and 0.9, with and without linear correction terms. SERVAL favors the short period in all six settings. For DRS with offsets alone, the score changes from +2.484 to -5.878 when the eccentricity limit increases. The score is 75 ln(Q_long/Q_short), where Q is the weighted sum of squared residuals. Positive scores favor the short period. With a trend and two Earth-velocity terms, the DRS scores are -0.793 and -3.678. The long-period DRS fits reach the eccentricity limit in every setting. Under the trend model, the paired scale difference for the fixed source curve is -0.297. Its conditional 95 percent interval, based on ten observing seasons, extends from -0.731 to +0.138. The period choice depends on the measurement method and model. The amplitude difference is not secure across the tested models. The measurements share spectra and noise. These tests do not confirm a planet or select the true period. The package includes data, code, figures, source hashes, repeat instructions, and 8000 conditional noise trials.
HD 205536 · HARPS · radial velocity · annual alias · SERVAL · DRS · exoplanet candidate · eccentricity
References
4- 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
Provides the candidate, saved orbit, nightly SERVAL reference, and source-search context.
- usesIndependent 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 sci:sha256:1b429149b29b478f8b85a22182153f1e36c4ea06d284bbeb276a362b6f2254b1
Reports no usable independent RV data for this candidate in its tested public sources. Our work tests paired measurements from the original spectra.
- usesdoi:10.1051/0004-6361/202348263
HARPS-RVBank v2 provides the public DRS and SERVAL velocities, errors, indicators, and corrections.
- doi:10.1088/0004-637X/722/1/937
Explains how observation gaps produce radial-velocity aliases and how to test competing periods.
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