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It is already stated in the previous studies that the radius of the giantplanets is affected by stellar irradiation. The confirmed relation betweenradius and incident flux depends on planetary mass intervals. In this study, weshow that there is a single relation between radius and irradiated energy pergram per second ($l_-$), for all mass intervals. There is an extra increase inradius of planets if $l_-$ is higher than 1100 times energy received by theEarth ($l_\oplus$). This is likely due to dissociation of molecules. The tidalinteraction as a heating mechanism is also considered and found that itsmaximum effect on the inflation of planets is about 15 per cent. We alsocompute age and heavy element abundances from the properties of host stars,given in the TEPCat catalogue (Southworth 2011). The metallicity given in theliterature is as [Fe/H]. However, the most abundant element is oxygen, andthere is a reverse relation between the observed abundances [Fe/H] and [O/Fe].Therefore, we first compute [O/H] from [Fe/H] by using observed abundances, andthen find heavy element abundance from [O/H]. We also develop a new method forage determination. Using the ages we find, we analyse variation of both radiusand mass of the planets with respect to time, and estimate the initial mass ofthe planets from the relation we derive for the first time. According to ourresults, the highly irradiated gas giants lose 5 per cent of their mass inevery 1 Gyr.

On the structure and evolution of planets and their host stars $-$ effects of various heating mechanisms on the size of giant gas planets