IAA authors:
Fernández, M.;Aceituno, F.
Authors:
Maciejewski, G.;Golonka, J.;Łoboda, W.;Ohlert, J.;Fernández, M.;Aceituno, F.
Journal:
Monthly Notices of the Royal Astronomical Society
Abstract:
Hot Jupiters have been perceived as loners devoid of planetary companions in close orbital proximity. However, recent discoveries based on space-borne precise photometry have revealed that at least some fraction of giant planets coexists with low-mass planets in compact orbital architectures. We report detecting a 1.446-d transit-like signal in the photometric time series acquired with the Transiting Exoplanet Survey Satellite (TESS) for the WASP-84 system, which is known to contain a hot Jupiter on a circular 8.5-d orbit. The planet was validated based on TESS photometry, and its signal was distilled in radial velocity measurements. The joint analysis of photometric and Doppler data resulted in a multiplanetary model of the system. With a mass of $15\, \mathrm{ M}_{{\oplus }}$, radius of $2\, \mathrm{ R}_{{\oplus }}$, and orbital distance of 0.024 au, the new planet WASP-84 c was classified as a hot super-Earth with the equilibrium temperature of 1300 K. A growing number of companions to hot Jupiters indicates that a non-negligible part of them must have formed under a quiescent scenario such as disc migration or in situ formation.
URL:
https://ui.adsabs.harvard.edu/#abs/2023MNRAS.525L..43M/abstract
Keywords:
techniques: photometric;techniques: radial velocities;planets and satellites: detection;planets and satellites: formation;planets and satellites: terrestrial planets;stars: individual: WASP-84 (BD+02 2056);Astrophysics - Earth and Planetary Astrophysics