A hot super-Earth planet in the WASP-84 planetary system

DOI: 
10.1093/mnrasl/slad078
Publication date: 
31/10/2023
Main author: 
Maciejewski, G.
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
Publication type: 
Article
Volume: 
525
Pages: 
L43
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.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2023MNRAS.525L..43M/abstract
ADS Bibcode: 
2023MNRAS.525L..43M
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