Universe  ID: 14264

TESS Finds System’s Second Earth-Size World

Using data from NASA’s Transiting Exoplanet Survey Satellite, scientists have identified an Earth-size world, called TOI 700 e, orbiting within the habitable zone of its star – the range of distances where liquid water could occur on a planet’s surface. The world is 95% Earth’s size and likely rocky.

Astronomers previously discovered three planets in this system, called TOI 700 b, c, and d. Planet d also orbits in the habitable zone. But scientists needed an additional year of TESS observations to discover TOI 700 e.

TOI 700 is a small, cool M dwarf star located around 100 light-years away in the southern constellation Dorado. In 2020, scientists announced the discovery of the Earth-size, habitable-zone planet d, which is on a 37-day orbit, along with two other worlds.

The innermost planet, TOI 700 b, is about 90% Earth’s size and orbits the star every 10 days. TOI 700 c is over 2.5 times bigger than Earth and completes an orbit every 16 days. The planets are probably tidally locked, which means they spin only once per orbit such that one side always faces the star, just as one side of the Moon is always turned toward Earth.

TOI 700 e, which may also be tidally locked, takes 28 days to orbit its star, placing planet e between planets c and d in the so-called optimistic habitable zone.

Scientists define the optimistic habitable zone as the range of distances from a star where liquid surface water could be present at some point in a planet’s history. This area extends to either side of the conservative habitable zone, the range where researchers hypothesize liquid water could exist over most of the planet’s lifetime. TOI 700 d orbits in this region.

Finding other systems with Earth-size worlds in this region helps planetary scientists learn more about the history of our own solar system.

 

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For More Information

https://www.nasa.gov/feature/nasa-s-tess-discovers-planetary-system-s-second-earth-size-world/


Credits

Jeanette Kazmierczak (University of Maryland College Park): Lead Science Writer
Sophia Roberts (AIMM): Producer
Scott Wiessinger (KBRwyle): Producer
Sophia Roberts (AIMM): Narrator
Robert Hurt (IPAC): Animator
Emily Gilbert (NASA/JPL): Scientist
Please give credit for this item to:
NASA's Goddard Space Flight Center. However, individual items should be credited as indicated above.

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https://svs.gsfc.nasa.gov/14264

Mission:
TESS

This item is part of these series:
Astrophysics Animations
Astrophysics Features
Astrophysics Visualizations

Keywords:
SVS >> Exoplanet
NASA Science >> Universe
SVS >> Edited Feature
SVS >> Music
SVS >> HDTV
DLESE >> Narrated
SVS >> TESS