NASA announces new 'super-Earth': Exoplanet orbits in 'habitable zone,' is only 137 light-years away

The exoplanet, TOI-715 b, is about one and a half times the width of Earth.

February 5, 2024, 1:57 PM

Could a recently discovered "super-Earth" have the potential temperature and conditions to sustain life?

The new exoplanet is situated "fairly close to us" -- only 137 light-years away -- and orbits within a "habitable zone," according to NASA.

Astronomers say the planet, dubbed TOI-715 b, is about one and a half times the width of Earth and orbits a small, reddish star. The same system also might harbor a second, Earth-sized planet, which, if confirmed, "would become the smallest habitable-zone planet discovered by TESS [the Transiting Exoplanet Survey Satellite] so far," NASA said in a Jan. 31 press release.

Due to the super-Earth's distance from its parent star, it could be in a conservative "habitable zone" and harbor the right temperature for liquid water to form on its surface, which is essential to sustain life, according to the agency, which also added that "several other factors would have to line up, of course."

NASA said the measurements of the habitable zone -- "a narrower and potentially more robust definition than the broader 'optimistic' habitable zone" -- put the newly discovered planet, and possibly the smaller Earth-sized planet, in "prime position" from its parent star.

This illustration shows one way that planet TOI-715 b, a super-Earth in the habitable zone around its star, might appear to a nearby observer.

The agency said that because of the short distance the super-Earth orbits from its parent star, a red dwarf that's smaller and cooler than our Earth's sun, a "year" for the planet is equal to 19 Earth days.

The tighter orbits mean the "planets can be more easily detected and more frequently observed," NASA said.

Since its launch in 2018, TESS has been adding to astronomers' stockpile of habitable-zone exoplanets, such as TOI-715 b, that could be more closely scrutinized by NASA's James Webb Space Telescope, the agency said.

The Webb telescope is designed to not only detect exoplanets but "explore the composition of their atmospheres, which could offer clues to the possible presence of life," NASA said.

The super-Earth research and discovery was led by Georgina Dransfield at the University of Birmingham in the U.K. and published in the "Monthly Notices of the Royal Astronomical Society" journal in January.

The findings mark another step forward in astronomers' mission to understand what atmospheric conditions are needed to sustain life and further explore the characteristics of exoplanets beyond our solar system, NASA said.

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