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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Abstract

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
Volume7
Issue number8
Early online date16 Aug 2023
DOIs
Publication statusPublished - 16 Aug 2023

Keywords

  • Keplerian orbit
  • Radial velocity
  • Nested sampling
  • Exoplanets

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