G. Maciejewski, J. Golonka, W. Loboda, J. Ohlert, M. Fernández, F. Aceituno
2023, Monthly Notices of the Royal Astronomical Society: Letters, Volume 525, Issue 1, October 2023, Pages L43–L49
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 M⊕, radius of 2 R⊕, 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.
Daten des Exoplaneten WASP-84c
Radius: 2 Erdradien
Masse: 15 Erdmassen
mittlere Dichte: 11 Tonnen/Kubikmeter
mittlere Oberflächentemperatur: 1300 Kelvin
Umlaufsdauer um WASP-84: 1.446 Tage
Klassifizierung: heisse Supererde
Daten des Muttersterns WASP-84
Entfernung: 400 Lichtjahre
Spektralklasse: K0
Masse: 0.853 Sonnenmassen
Radius: 0.768 Sonnenradien
effektive Temperatur: 5280 Kelvin
Klassifizierung: aktiver K0-Zwergstern
Alter: 1 Milliarde Jahre
https://doi.org/10.1093/mnrasl/slad078
https://arxiv.org/abs/2305.09177v2
https://arxiv.org/pdf/2305.09177v2.pdf