TOI-4138 b is a transiting exoplanet orbiting the G-type subgiant TOI-4138 1,674 light years away in the northern circumpolar constellation Ursa Minor.

The paper states that it’s inflated due to heating from its host star, which has a high luminosity.

This corresponds to a separation from its host close to one eighth of the distance of Mercury from the Sun.

Since the inclination is known, doppler spectroscopy measurements give the planet a mass only 67% that of Jupiter.

[1] Its separation is comparable with HD 209458 b, but is much larger due to the evolved state of the host star.