TOI-270 is a star with 0.4 times the mass of the Sun, and 0.38 times its radius. It is located 73.32 light years away from the solar system.
TOI-270 is known to have 3 exoplanets in orbit around it.
TOI-270 b was discovered by the Transiting Exoplanet Survey Satellite (TESS) observatory, in 2019-07, using the transit method. Its semi-major axis is 0.03 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of TOI-270 b is 2.089 times the mass of Earth. The radius of TOI-270 b is 1.247 that of Earth. At 2.089 Earth masses, TOI-270 b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes. No Super Earths are known to exist in our solar system, but if it exists, the so-called Planet Nine could very well be a super Earth, as it is hypothesized to have a mass between five and ten Earth masses.
TOI-270 c was discovered by the Transiting Exoplanet Survey Satellite (TESS) observatory, in 2019-07, using the transit method. Its semi-major axis is 0.05 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of TOI-270 c is 6.455 times the mass of Earth. The radius of TOI-270 c is 2.420 that of Earth. At more than 10 Earth masses, TOI-270 c is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune in our solar system.
TOI-270 d was discovered by the Transiting Exoplanet Survey Satellite (TESS) observatory, in 2019-07, using the transit method. Its semi-major axis is 0.07 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of TOI-270 d is 5.183 times the mass of Earth. The radius of TOI-270 d is 2.130 that of Earth. At more than 10 Earth masses, TOI-270 d is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune in our solar system.