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NASA’s Kepler telescope discovers two mini-Neptune exoplanets before their deaths


“Based on data obtained while the spacecraft was literally working through smoke, we discovered what were the last planets discovered by Kepler.”

The efficient Kepler space telescope, which closed NASA’s powerful eye nearly five years ago, continued to find exoplanets until its last breath. A team of astrophysicists and citizen astronomers analyzes the last piece of data submitted KeplerThey say they’ve found two new worlds and a candidate planet orbiting three dim stars around 400. light years from the world

For now these are just exoplanetsDiscovered in the telescope’s latest dataset, making them the last worlds Kepler saw shortly before his death. run out of fuel and closed at the end of 2018.

“These are pretty average planets in the grand scheme of Kepler observations,” Elise Incha, a senior researcher at the University of Wisconsin-Madison and lead author of the new study, said in a NASA statement. she said. “But they’re fascinating because Kepler observes them during the last few days of their operation. It shows how good Kepler was at planet-hunting even at the end of his life.”

The Kepler telescope was launched in March 2009 to observe 150,000 selected stars in the constellation Cygnus as part of a 3.5-year primary mission. The spacecraft documented dips in starlight showing the orbits of planets, a method known as the “transit method.”

In this limited dataset containing information on 33,000 additional stars, the team observed a transit for three exoplanets around three faint stars. Two of these planets revolve around the cold red dwarfs and what astronomers say by mini-Neptunes: K2-416 b, 2.6 times wider than Earth and orbiting its star every 13 Earth days; and K2-417 b, which is three times wider than Earth and orbits the star every 6.5 days.

The last observation campaign by NASA’s Kepler space telescope in late 2018 lasted only a month. As the spacecraft’s orientation control fuel began to run out, it was unable to hold its position long enough to collect useful observations. After all, astronomers only had about seven days of high-quality data. The research team worked with a group of citizen scientists and professional astronomers and found two confirmed planets and a “candidate” in the latest data. (Image credit: NASA/JPL-Caltech (K. Walbolt))

Both worlds are smaller than Neptune. The researchers say they were surrounded by a warm, diluted atmosphere and were likely uninhabitable. A third candidate orbiting a sun-like star called EPIC 245978988 has yet to be confirmed.

The team also looked at low-quality data Kepler had collected a week before it left to make sure what they were seeing were indeed planets and not false positives, for example from two closely orbiting stars. operation.

“We were trying to see what latest bits of information we could extract from this,” said study co-author Andrew Vanderburgh, a professor of physics at MIT’s Kavli Institute for Astrophysics and Space Studies. expression. “And what we’re really trying to do is compare the last few days to the last few minutes of observations collected by Kepler.” Source

Source: Port Altele

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