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A growing number (over 100!) of extra-solar planets (ESPs) have beendiscovered by transit photometry, and these systems are important because thetransit strongly constrains their orbital inclination and allows accuratephysical parameters for the planet to be derived, especially their radii. Theirmass-radius relation allows us to probe their internal structure. In thepresent work we calculate Safronov numbers for the current sample of ESP andcompare their masses and radii to current models with the goal of obtainingbetter constrains on their formation processe. Our calculation of Safronovnumbers for the current TESP sample does show 2 classes, although about 20% lieabove the formal Class I definition. These trends and recent results that argueagainst a useful distinction between Safronov classes are under furtherinvestigation. Mass-radius relations for the current sample of TESP areinconsistent with ESP models with very large core masses (\geq 100 M\oplus).Most TESP with radii near 1RJ are consistent with models with no core mass orcore masses of 10 M\oplus . The inflated planets, with radii \geq 1.2 RJ arenot consistent with current ESP models, but may lie along the lower end ofmodels for brown dwarfs. Although such models are nascent, it is important toestablish trends for the current sample of ESP, which will further theunderstanding of their formation and evolution.

Comparison of current models for Hot Jupiters to the sample of transiting exoplanets