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2023RNAAS...7..175B - Research Notes of the AAS, 7, 175 (2023/August-0)

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

BAYCROFT T.A., BADNELL H., BLACKER S. and TRIAUD A.H.M.J.

Abstract (from CDS):

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.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radial velocity - Exoplanets - Nested sampling - Keplerian orbit

Simbad objects: 2

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