GJ 9404 b: A Confirmed Eccentric Planet, and not a Candidate

Thomas A. Baycroft*, Harry Badnell, Samuel Blacker, Amaury H. M. J. Triaud

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Eccentric orbits can be decomposed into a series of sine curves which affects how the false alarm probability is computed when using traditional periodograms on radial-velocity data. Here we show that a candidate exoplanet orbiting the M dwarf GJ 9404, identified by the HADES survey using data from the HARPS-N spectrograph, is in fact a bona fide planet on a highly eccentric orbit. Far from a candidate, GJ 9404b is detected with a high confidence. We reach our conclusion using two methods that assume Keplerian functions rather than sines to compute a detection probability, a Bayes Factor, and the false-inclusion probability periodogram. We compute these using nested sampling with kima.
Original languageEnglish
Article number175
JournalResearch Notes of the AAS
Issue number8
Early online date16 Aug 2023
Publication statusPublished - 16 Aug 2023


  • Keplerian orbit
  • Radial velocity
  • Nested sampling
  • Exoplanets


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