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NASA scientists discover nearly 100 new planets beyond solar system

Today some 3,600 exoplanets have been found, ranging from rocky Earth-sized planets to large gas giants like Jupiter

Press Trust of India  |  London 

Representative image. (Photo: Shutterstock)
Representative image. (Photo: Shutterstock)

Scientists have confirmed nearly 100 new planets outside our solar system, bringing the total number of exoplanets found using NASA's K2 mission to almost 300.

"We started out analysing 275 candidates, of which 149 were validated as real exoplanets. In turn, 95 of these planets have proved to be new discoveries," said Andrew Mayo, a doctoral student at the

"This research has been underway since the first K2 data release in 2014," said Mayo, the main published in

Mayo and his colleagues analysed hundreds of signals of potential exoplanets to determine which signals were created by exoplanets and which were caused by other sources.

"We found that some of the signals were caused by multiple or noise from the spacecraft. But we also detected planets that range from sub-Earth-sized to the size of Jupiter and larger," said Mayo.

One of the planets detected was orbiting a very bright star.

The spacecraft was launched in 2009 to hunt for exoplanets in a single patch of sky, but in 2013, a mechanical failure crippled the telescope.

However, astronomers and engineers devised a way to repurpose and save the space telescope by changing its field of view periodically.

This solution paved the way for the follow-up K2 mission, which is still ongoing as the spacecraft searches for transits.

These transits can be found by registering dips in light caused by the shadow of an as it crosses in front of its host star.

The dips are indications of exoplanets, which must then be examined more closely in order to confirm their nature.

The first orbiting a star similar to our own sun was detected in 1995. Today some 3,600 exoplanets have been found, ranging from rocky Earth-sized planets to like Jupiter.

"We validated a on a 10-day orbit around a star called HD 212657, which is now the brightest star found by either the or K2 missions to host a validated Planets around bright stars are important because astronomers can learn a lot about them from ground-based observatories," said Mayo.

"Exoplanets are a very exciting field of space science. As more planets are discovered, astronomers will develop a much better picture of the nature of exoplanets which in turn will allow us to place our own solar system into a galactic context," he said.

First Published: Fri, February 16 2018. 18:49 IST
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