sciscape Publications
← All publications
astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.SR · Solar and Stellar Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

Fits to 26 ESPRESSO spectra show no significant blue to red velocity signal at 19.679 days in HD 111232

We test the wavelength dependence of the 19.679-day velocity signal in HD 111232. We reuse 26 public ESPRESSO spectra from an earlier candidate study. We measure Gaussian centers in two detector bands. We fit their difference at the fixed period. The model has a separate offset and trend for each of two seasons. The fitted differential amplitude is 0.22 m/s. The approximate 95% HC3 upper bound is 0.87 m/s. We then add offsets for three pipeline versions. The amplitude becomes 0.18 m/s and the bound becomes 0.86 m/s. The wild bootstrap p values are 0.62 and 0.65. A second test fixes the published orbit shape and phase. It gives a differential amplitude of 0.02 plus or minus 0.20 m/s. The extraction recovers 99.95% of artificial shifts in the blue band. No tested extraction gives a significant color signal. Fits to narrower profile ranges give weaker bounds, up to 1.92 m/s. The full-profile bound assumes the stated extraction, time model and error model. Activity with a small wavelength dependence can pass this test. The shared observations prevent independent planet confirmation. The package contains all FITS inputs, hashes, measurements, code and figures. It includes instructions that reproduce all outputs without network access.

HD 111232 · ESPRESSO · radial velocity · planet candidate · wavelength dependence · stellar activity · public data · reproducible research

Admitted 2 citing publications

References

5
  1. 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

    We reuse its 26 ESPRESSO observations, data identifiers and fixed HARPS orbit for a new wavelength test. The observations are shared, so this is not independent confirmation.

  2. 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 search supplied the HD 111232 candidate tested in the later independent-velocity study on which we build.

  3. usesdoi:10.18727/archive/21

    We use public ESPRESSO CCF products from the ESO Science Archive Facility. The exact files and their unchanged headers are preserved.

  4. doi:10.1051/0004-6361/202038306

    This paper describes ESPRESSO and its instrument design.

  5. doi:10.1051/0004-6361/202142337

    Section 5.3 gives a prior wavelength test of a small planet signal and describes the value of template matching. Our test uses a different star and two detector bands.

Cited by

2 publications

Public catalog entries on Sciscape.