TOI 700 d


TOI 700 d is an exoplanet, likely rocky, orbiting TOI 700, a red dwarf star 101.4 light-years away in the Dorado constellation. The exoplanet is the first Earth-sized exoplanet in the habitable zone discovered by the Transiting Exoplanet Survey Satellite. It has been estimated that the planet receives about 86% the energy that the Earth receives from the Sun.

Physical characteristics

Mass, radius and temperature

TOI 700 d is Earth-sized, an exoplanet that has a radius and mass similar to the Earth. It has an estimated mass of around and a radius of.

Host star

TOI 700 is a red dwarf of spectral class M that is 40% the mass, 40% the radius and 50% of the temperature of the Sun. The star is bright with low levels of stellar activity. Over the 11 sectors observed with TESS, the star does not show a single white-light flare. The low rotation rate is also an indicator of low stellar activity.

Orbit

TOI 700 d orbits its host star every 37.4260 days.

Proposed habitability

TOI 700 d orbits in the habitable zone of its host star TOI 700. The solar wind ram pressure and intensity of the interplanetary magnetic field are expected to be similar to the Earth`s, therefore retention of planetary atmosphere is likely.

Discovery

TOI 700 d was discovered by the Transiting Exoplanet Survey Satellite in early January 2020.