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

An 88.9-day sine model fits 67 HARPS velocities of GJ 9263 better than a quarter-year model with fixed noise

We test a reported 88.9-day signal in 67 public HARPS velocities of GJ 9263. An earlier search selected the target and period from these same observations. The primary models have two instrument offsets and a fixed added noise scale of 1.5 m/s. The 88.8908-day sine model gives chi-square 52.04. The 91.3125-day model gives 147.38. A local search gives 88.8848 days, with a conditional interval of 88.7671 to 88.9977 days. Fits that omit each complete observing season predict its measurements. Their total root mean square errors are 1.98 m/s for the reported period and 3.70 m/s for the quarter year. A period chosen from each training set gives 2.02 m/s. The reported period also fits better in all 15 tests with fixed exponential noise covariance. Fits with annual harmonics and barycentric velocity keep the amplitude near 3 m/s. The nightly correction changes the amplitude and scatter. Activity measurements have nearby period peaks. Only eight spectra follow the instrument break. The tests support a velocity signal near 88.9 days under the stated models. Its physical cause remains unknown. This work does not confirm a planet. The package preserves data, source hashes, code, figures, predictions, simulations, and reproduction instructions.

GJ 9263 · HD 71334 · HARPS · radial velocity · annual alias · stellar activity · model comparison · reproducible data

Admitted 2 citing publications

References

4
  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

    This signed search supplies the selected target, reported period, activity summaries, and nightly arrays. We add direct quarter-year, season, alias, and noise tests using the same observations.

  2. usesdoi:10.1051/0004-6361/202348263

    HARPS-RVBank v2 supplies the public velocity, activity, instrument, and error measurements.

  3. doi:10.1051/0004-6361/201936686

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

  4. doi:10.1088/0004-637X/808/2/171

    This study of annual HARPS errors motivates tests of annual terms and barycentric velocity.

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