EdgarKeymasterSeptember 4, 2014 at 6:29 pmPost count: 148
- Astronomers led by Southern Connecticut State University say that half of all planets in the universe may have two suns
- The finding was made by observing stars already found to host planets
- The team found that 50 per cent of such stars were in binary systems
- This means more planets than thought are orbiting multiple stars
- Some of the planets may never-ending day time, while others would just have an unusually bright second star among others in their night sky
Imagine a world where it’s never night time; when one sun moves below the horizon another takes its place, providing endless light.
This might sound like a sci-fi scenario, but research now suggests that this could be far more common than thought.
In fact, up to 50 per cent of stars hosting planets may actually be in binary systems, providing their worlds with odd characteristics not seen in our solar system.
Astronomers led by Southern Connecticut State University say that half of all planets in the universe may have two suns.
The research was carried out by astronomers led by Dr Elliott Horch from Southern Connecticut State University.
It had previously been known that binary stars were commonplace, with half the stars in the night sky orbiting at least one other.
But it had been unknown how such companion stars affected the formation of planets.
Now it seems that such binary systems have little effect, with half of the planets discovered to date by the Kepler space telescope found to be in orbit around binary stars.
These are known as circumbinary planets, those that orbit two stars.
How these planets come to orbit two stars is unknown, however; it’s thought they may be plucked from elsewhere.
The team used the WIYN telescope on Kitt Peak in southern Arizona and the Gemini North Telescope on Mauna Kea in Hawaii to make the discovery.
By obtaining digital images of the sky surrounding a star, the team detected companion stars up to 125 times fainter than their target.
This equated to stars ranging in distance from 100 times the Earth-sun distance to just a few times this distance.
And in the study they found that about 50 per cent of stars with planets in orbit around them were actually in a binary system.
‘It’s interesting and exciting that exoplanet systems with stellar companions turn out to be much more common than was believed even just a few years ago,’ said Dr Horch.
And another intriguing conclusion of the study is that, for any given circumbinary planet, it is difficult to work out which star it is orbiting.
Co-author of the study, Dr. Steve Howell of Nasa Ames Research Center, said: ‘An interesting consequence of this finding is that in the half of the exoplanet host stars that are binary we can not, in general, say which star in the system the planet actually orbits.’
While some planets may resemble Tatooine from Star Wars, with two bright suns in the sky, other circumbinary planets in wide orbits around their stars may simply have one unusually bright star among others in their sky in addition to their sun.
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