The former periodicity is likely due to stellar pulsation, whereas the latter could be indicative of the presence of an additional planetary companion with 2.14 Jupiter masses, moderate eccentricity (e=0.13) and located at 2.6 Astronomical Units away from the giant star.
Nevertheless, the nature of such a signal is still unclear and further investigations are needed to confirm or rule out an additional substellar companion.
The true mass, as with the majority of other extrasolar planets discovered by the radial velocity method, is unknown.
[3] Depending on the planet's inclination relative to Earth, it may be sufficiently massive to be classified as a brown dwarf.
[2] Together, they shine with apparent magnitude 2.04, making it the second-brightest star in Leo after Regulus.