Researchers identify 121 giant planets that may have habitable moons

June 14, 2018, University of California - Riverside
Artist's illustration of a potentially habitable exomoon orbiting a giant planet in a distant solar system. Credit: NASA GSFC: Jay Friedlander and Britt Griswold

We've all heard about the search for life on other planets, but what about looking on other moons?

In a paper published Wednesday (June 13) in The Astrophysical Journal, researchers at the University of California, Riverside and the University of Southern Queensland have identified more than 100 giant that potentially host moons capable of supporting life. Their work will guide the design of future telescopes that can detect these potential moons and look for tell-tale signs of life, called biosignatures, in their atmospheres.

Since the 2009 launch of NASA's Kepler telescope, scientists have identified thousands of planets outside our solar system, which are called exoplanets. A primary goal of the Kepler mission is to identify planets that are in the habitable zones of their stars, meaning it's neither too hot nor too cold for liquid water—and potentially life—to exist.

Terrestrial (rocky) planets are prime targets in the quest to find life because some of them might be geologically and atmospherically similar to Earth. Another place to look is the many gas giants identified during the Kepler mission. While not a candidate for life themselves, Jupiter-like planets in the habitable zone may harbor rocky moons, called exomoons, that could sustain life.

Artist's illustration of a potentially habitable exomoon orbiting a giant planet in a distant solar system. Credit: NASA GSFC: Jay Friedlander and Britt Griswold.

"There are currently 175 known moons orbiting the eight planets in our solar system. While most of these moons orbit Saturn and Jupiter, which are outside the Sun's habitable zone, that may not be the case in other solar systems," said Stephen Kane, an associate professor of planetary astrophysics and a member of the UCR's Alternative Earths Astrobiology Center. "Including rocky exomoons in our search for life in space will greatly expand the places we can look."

The researchers identified 121 that have orbits within the habitable zones of their stars. At more than three times the radii of the Earth, these gaseous planets are less common than terrestrial planets, but each is expected to host several large moons.

Scientists have speculated that exomoons might provide a favorable environment for life, perhaps even better than Earth. That's because they receive energy not only from their star, but also from radiation reflected from their planet. Until now, no exomoons have been confirmed.

"Now that we have created a database of the known giant planets in the of their star, observations of the best candidates for hosting potential exomoons will be made to help refine the expected exomoon properties. Our follow-up studies will help inform future telescope design so that we can detect these moons, study their properties, and look for signs of ," said Michelle Hill, an undergraduate student at the University of Southern Queensland who is working with Kane and will join UCR's graduate program in the fall.

Explore further: Researchers have identified 121 giant planets that may have habitable moons

More information: Michelle L. Hill et al, Exploring Kepler Giant Planets in the Habitable Zone, The Astrophysical Journal (2018). DOI: 10.3847/1538-4357/aac384

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Parsec
5 / 5 (1) Jun 14, 2018
This is simple idle speculation on my part, but given the huge number of moons in our solar system compared to the planetary count, it seems to me that the possibility of life evolving on a moon is far greater than on a planet.

And if life is really and truly abundant in the universe, planetary based life is probably far in the minority.
Thorium Boy
1 / 5 (1) Jun 15, 2018
Well, if they discover life on Europa or another moon in our system, that would provided some evidence. But the only way they'll get to another star system within the near future is...Project Orion. Not junky chemical rockets.
rrwillsj
1 / 5 (2) Jun 15, 2018
It makes me grouchy having to agree with you guys. Especially before my second cup of coffee.

But you both made sensible evaluations of what we know. And conservative suggestions of how to use the technology available.

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