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-day 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-day 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 multi-planetary model of the system. With a mass of 15M⊕, radius of 2R⊕, 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.
@article{arxiv.2305.09177,
title = {A hot super-Earth planet in the WASP-84 planetary system},
author = {G. Maciejewski and J. Golonka and W. Łoboda and J. Ohlert and M. Fernandez and F. Aceituno},
journal= {arXiv preprint arXiv:2305.09177},
year = {2023}
}
Comments
Accepted for publication in MNRAS Letters, updated with additional materials to reflect the published version