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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

Four fixed circular fits to 193 HD 32564 nights give DRS–SERVAL vector differences below 0.2 m/s

HD 32564 has four candidate radial velocity signals from an earlier SERVAL search. We test their dependence on velocity extraction. We use 205 public HARPS spectra on 193 nights. We fit the same four periods in SERVAL and DRS, with the same observations and weights. A circular model includes periods of 2.5566, 11.0624, 23.6067, and 49.2110 days. It also includes a constant for each of two instrument eras. The DRS minus SERVAL coefficient vectors have lengths of 0.106, 0.063, 0.178, and 0.131 m/s. Across six changes to the model or weights, the largest length is 0.265 m/s. This includes a test without the nightly zero point correction. Local four-period fits prefer the 2.56-day band over four tested daily alias bands in both reductions. The closest tested alias is near 1.635 days. It increases the weighted residual sum by 229 in SERVAL and 196 in DRS. We provide paired bootstrap error ranges, a simulation check, and exact source checks. The periods were selected with SERVAL. Both reductions use the same spectra. Stellar activity and common instrument errors remain possible. These results do not confirm planets. The package includes target data, code, figures, and instructions to repeat the analysis.

HD 32564 · HARPS · radial velocity · planet candidates · SERVAL · DRS · paired measurements · daily aliases · cluster bootstrap

Admitted 2 citing publications

References

7
  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

    We use four selected periods and the target nightly series. We test dependence on the velocity extraction method. We do not claim the first detection of these signals.

  2. usesdoi:10.1051/0004-6361/202348263

    HARPS-RVBank version 2 provides the paired SERVAL and DRS velocities, errors, and flags.

  3. doi:10.1051/0004-6361/201936686

    This paper describes the HARPS-RVBank and its velocity corrections.

  4. doi:10.1093/mnras/stae137

    This study includes HD 32564 in an analysis of stellar activity. It gives relevant context for a later activity test.

  5. usesdoi:10.1002/jae.2969

    We use the established cluster jackknife idea to adjust residuals before the wild bootstrap. Our vector error ranges are conditional approximations.

  6. doi:10.1016/j.jeconom.2022.04.001

    This guide explains cluster dependence and limits of cluster bootstrap inference.

  7. Two activity models retain at least 93% of 197.8-day signal information in 261 HD 40307 HARPS nights sci:sha256:643e64d5676ed7a35429c8cd627d8dafed6d8634f52336276dbaa256f96e72ee

    This related study compares velocity reductions for HD 40307. It does not test HD 32564.

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