TOI-4034: A Distant Star With a Close-Orbiting Giant

TOI-4034 is a star located 2430 light-years away, and it hosts one known planet. The star is estimated to be 5.7 billion years old, with a mass of 1.19 solar masses and a radius of 1.83 solar radii. Its reported temperature is 5890 K, and its reported mass, radius, and temperature are all larger or hotter than the Sun's.

The planet TOI-4034 b is classified as Jupiter-like and was discovered by transit in 2026. A transit occurs when a planet passes in front of its star from our viewpoint, causing a small dip in observed brightness; repeated dips help establish orbital periods. TOI-4034 b has an orbital period of 1.8 days and a radius of 17.7 Earth radii, larger than Earth's. Its mass is 277 Earth masses, also larger than Earth's. Its mean density is 0.274 g/cm³, 0.0498 times Earth's.