Over 100 new exoplanets discovered

Scientists have discovered a cache over 100 new exoplanets using data from NASA's Kepler Space telescope as well as ground-based observatories.

The diverse planets are expected to play a large role in developing the research field of exoplanets and life in the Universe.

Exoplanets, which revolve around stars other than the Sun, have been actively researched in recent years.

One of the reasons is the success of the Kepler Space Telescope, which launched in 2009 to search for exoplanets.

If a planet crosses in front of its parent star, then the observed brightness of the star drops by a small amount. The Kepler Space Telescope detected many exoplanets using this method.

However, such dimming phenomena could be caused by other reasons. Therefore, confirmation that the phenomena are really caused by exoplanets is very important, researchers said.

The Kepler space telescope experienced mechanical trouble in 2013, which led to a successor mission called K2. Astronomers around the world are competing to confirm exoplanets suggested by the K2 data.

Scientists at the University of Tokyo and National Institutes of Natural Sciences in Japan investigated 227 K2 exoplanet candidates using other space telescopes and ground-based telescopes.

They confirmed that 104 of them are really exoplanets.

Seven of the confirmed exoplanets have ultra-short orbital periods less than 24 hours. The formation process of exoplanets with such short orbital periods is still unclear.

Further study of these ultra-short period planets will help to advance research into the processes behind their formation.

They also confirmed many low-mass rocky exoplanets with masses less than twice that of the Earth as well as some planetary systems with multiple exoplanets.

"Although the Kepler Space Telescope has been officially retired by NASA, its successor space telescope, called TESS, has already started collecting data," said John Livingston, a PhD student at the University of Tokyo.

"In just the first month of operations, TESS has already found many new exoplanets, and it will continue to discover many more. We can look forward to many new exciting discoveries in the coming years," said Livingston.