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TOI 700 d

  • 09 Jan 2020
  • 3 min read

Why in News

The National Aeronautics and Space Administration (NASA) has reported the discovery of an Earth-size planet, named TOI 700 d.

  • The planet was found by NASA’s Transiting Exoplanet Survey Satellite (TESS) mission, which was launched in 2018. With TOI 700 d, TESS has discovered its first Earth-size planet in its star’s habitable zone.
  • In comparison to the Earth: TOI 700 d measures 20% larger than Earth. It orbits its star, TOI 700, once every 37 days.
    • The star, TOI 700, is an "M dwarf" located just over 100 light-years away in the southern constellation Dorado. It is roughly 40% of the Sun's mass and size, and has about half its surface temperature.
    • Two other planets orbit the star:
      • TOI 700 b, which is almost exactly Earth-size, probably rocky, and which completes an orbit every 10 days.
  • TOI 700 c, the middle planet, which is 2.6 times larger than Earth, is probably gas-dominated, and orbits every 16 days.
  • Orbits in Habitable Zone: TOI 700 d is the outermost planet, and the only one in the TOI 700’s habitable zone.
  • A habitable zone, also called the "Goldilocks zone" is the area around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets.
    • Earth is in the Sun’s Goldilocks zone. If Earth were where the dwarf planet Pluto is, all its water would freeze; on the other hand, if Earth were where Mercury is, all its water would boil off.
    • Goldilock Zone is always defined with reference to a particular star. It can be different for different stars.

M-dwarf Star

  • M dwarf or M-type star, also called Red Dwarf Star are the most numerous type of star in the universe and the smallest type of hydrogen-burning star.
  • These have masses from about 0.08 to 0.6 times that of the Sun.
  • In the Milky Way Galaxy, about three-fourths of the stars are red dwarfs.

Source: IE

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