The discovery of a planet 578 light years from Earth

Astronomers at the University of Pennsylvania in the United States have discovered an exoplanet TOI-3757 b, slightly larger than Jupiter, but three times less massive.
Scientists discovered this planet by the “transit” method, which includes searching for stars whose brightness curve decreases due to the passage of a large object in their background. The planetary nature of the signal detected in the star TOI-3757, which belongs to a red dwarf of the spectral type M, was confirmed by subsequent follow-up, according to what Russia Today reported.
TOI-3757 b has a radius of 1.09 times greater than that of Jupiter, and its mass is about 0.268 that of Jupiter. That is, its density is 0.27 grams per cubic centimeter. This makes it the least dense planet orbiting an M-type star. The planet orbits its parent star once every 3.44 days at a distance of about 0.038 AU. The planet’s equilibrium temperature is estimated at 759 K.
The parent star TOI-3757, in which the planet orbits, is located about 578 light-years from Earth, has an estimated age of 7.1 billion years and an effective temperature of 3913 Kelvin. It is 37 percent lighter than the Sun, and contains the lowest metallic “elements heavier than hydrogen” of all known red dwarfs with gas giants.