NASA finds three alien planets, including the ‘missing link’

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NASA’s Transiting Exoplanet Survey Satellite (TESS) has found a star, known as “TESS Object of Interest 270,” or TOI 270, 73 light-years away from Earth that has three exoplanets orbiting it, including a so-called “super-Earth” and two others that are described as Neptune-like.

“This system is exactly what TESS was designed to find — small, temperate planets that pass, or transit, in front of an inactive host star, one lacking excessive stellar activity, such as flares,” said the study’s lead author, Maximilian Günther, in a statement on NASA’s website. “This star is quiet and very close to us, and therefore much brighter than the host stars of comparable systems. With extended follow-up observations, we’ll soon be able to determine the make-up of these worlds, establish if atmospheres are present and what gases they contain, and more.”

This infographic illustrates key features of the TOI 270 system, located about 73 light-years away in the southern constellation Pictor. The three known planets were discovered by NASA’s Transiting Exoplanet Survey Satellite through periodic dips in starlight caused by each orbiting world. Insets show information about the planets, including their relative sizes, and how they compare to Earth. Temperatures given for TOI 270’s planets are equilibrium temperatures, calculated without the warming effects of any possible atmospheres. (Credit: NASA’s Goddard Space Flight Center/Scott Wiessinger)

Of particular interest is the smaller planet, TOI 270 b, as it is particularly close to the star and only slightly larger than our Earth. Described as an “oven-hot world” by NASA, TOI 270 b orbits the star every 3.4 days, is roughly 25 percent larger than Earth and is estimated to have a mass around 1.9 times greater than Earth’s.

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TOI 270 d is attracting interest from Günther’s team, as they believe the equilibrium temperature on the exoplanet is approximately 150 degrees Fahrenheit.

“TOI 270 is perfectly situated in the sky for studying the atmospheres of its outer planets with NASA’s future James Webb Space Telescope,” the study’s co-author Adina Feinstein added in the NASA release. “It will be observable by Webb for over half a year, which could allow for really interesting comparison studies between the atmospheres of TOI 270 c and d.”

Günther added that the discovery of TOI-270 will let researchers look at the “‘missing link’ between rocky Earth-like planets and gas-dominant mini-Neptunes, because here all of these types formed in the same system.” – READ MORE

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