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Three super-Earths discovered in habitable zone of same star ‘for the first time’

Published time: June 26, 2013 01:51
Edited time: June 27, 2013 09:00
Artistic image (image from www.eso.org)

Artistic image (image from www.eso.org)

Astronomers have found a record number of super-Earths orbiting in the habitable zone of a known star, 22 light years away from Earth. The planets, which have three suns, have one side illuminated at all times while the other is submerged in darkness.

The Gliese 667C star in the constellation of Scorpion has been well studied before. However, as a result of new observations the scientists made a stunning revelation – instead of three previously known planets the astronomers discovered up to seven, three of which are in the habitable zone of the star where liquid water could exist. All of those three planets are so-called super-Earths.

This is the first time that three such planets have been spotted orbiting in this zone in the same system,” said one of the authors of the study, Mikko Tuomi of the University of Hertfordshire, UK. "By adding some new observations and revisiting existing data we were able to confirm these three and confidently reveal several more. Finding three low-mass planets in the star's habitable zone is very exciting!"

The sky around Gliese 667C (image from www.eso.org)

"These planets are good candidates to have a solid surface and maybe an atmosphere like the Earth's, not something like Jupiter's," said co-author Rory Barnes in a press release issued by University of Washington.

Barnes added that they are located close to each other which "makes it like they are tidally locked,” which in this case means the same hemisphere always faces the star.

"Fortunately, we know that this state can still support life," he said.

Gliese 667C is a low-mass star in a triple star system Gliese 667 located 22 light years away from our Sun. It is the dimmest star in the system, and it has the habitable zone as “low-mass stars are intrinsically faint” and cooler. Moreover, this is the first system found with a fully packed habitable zone, according to the study which is to appear in the Astronomy & Astrophysics journal.  

The habitable zone of Gliese 667C lies entirely within an orbit the size of Mercury’s around the Sun.

"Super-Earths" are planets located within their star’s habitable zone, more massive than the Earth but less massive than Uranus and Neptune which are both approximately 15 Earth masses.

Planets within the star’s habitable zone are also called Goldilock planets. The  three  potentially habitable planets of this system are expected to always have the same side facing the star, so that their day and year will be the same lengths, with one side in perpetual sunshine and the other always night.

Viewed from these newly found three planets, the other two suns in the system would look like a pair of very bright stars visible at the daytime, and at night they would illuminate the planets as the full Moon illuminated the Earth, the study says.

The number of potentially habitable planets in our galaxy is much greater if we can expect to find several of them around each low-mass star — instead of looking at ten stars to look for a single potentially habitable planet, we now know we can look at just one star and find several of them,” adds co-author Rory Barnes.

Similar systems have been found before, however, most them were centered around stars which are too hot to be habitable.


image from www.eso.org


Comments (88)

 

Phil Asheeo 29.11.2013 15:47

Life would be tough there. Maybe around the night-day boundry. Still, nowhere remotely close to our situation. So far we have found 3500 other planets and the score as of 11292013 is:

The Great Void = 3500
Earths = 0

Lucky us!

Anonymous user 06.07.2013 00:58

It's all starting to come to light,

 

Alex 04.07.2013 19:42

I wonder how many of Earth's political leaders came from this place? Certainly with their being 3 planets, it reminds me lots about the 3 non-choices presented of British politics.

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