Friday, April 7, 2017

More Friday Afternoon Exo-Planet Space Science...

And now. . . to move into a more positive, life affirming space -- a new science note, then. And the full story link:

. . .The detection of an atmosphere around the super-Earth GJ 1132b marks the first time that an atmosphere has been detected around an Earth-like planet other than Earth itself," John Southworth, a researcher at Keele University in the United Kingdom and first author on the new work, said in a statement from the university. . . .

. . .The astronomers captured images of the planet's star using a telescope at the European Southern Observatory (ESO) in Chile. The researchers measured the star system with seven different wavelengths and used small dips in the star's brightness to determine the radius of the planet passing by during its 1.6-day orbits, according to a statement from the Max Planck Institute for Astronomy, which collaborated on the research. They were able to further clarify the planet's radius.

But the researchers also found something strange, they said: One of the wavelengths showed a larger dip in brightness than the others each time the planet passed by. This world, for some reason, appeared larger at that wavelength than at others, suggesting that the planet had a surrounding atmosphere that this wavelength couldn't penetrate, the researchers said.

While Earth's atmosphere is mostly nitrogen with a large oxygen component, and Venus' is a thick shroud of carbon dioxide, the researchers said that GJ 1132b's atmosphere is likely rich in water vapor or methane, based on their measurements. (It could be "a 'water world' with an atmosphere of hot steam," Southworth said.)

The discovery is particularly exciting because M-dwarf stars like GJ 1132 are the most common star type in the galaxy — and make up 20 of the 30 nearest stars to Earth — but their high levels of activity, like flares and streams of particles, could potentially blow away any forming atmosphere on nearby planets. If planets like GJ 1132b can maintain atmospheres, it opens up the possibility that many more potentially habitable worlds exist in the universe, the researchers said.

Going forward, GJ 1132b's atmosphere will be a high-priority target for study with the Hubble Space Telescope, ESO's Very Large Telescope and the future James Webb Space Telescope, launching in 2018, the researchers added.

The new work was detailed March 31 in The Astrophysical Journal. . . .

Onward then -- life is too precious, short and sweet -- to waste. . . Now you know.


No comments: