Starship Asterisk*

[attachment=0]PSO J318.5-22.jpg[/attachment]

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An international team of astronomers has discovered an exotic young planet that is not orbiting a star. This free-floating planet, dubbed PSO J318.5-22, is just 80 light-years away from Earth and has a mass only six times that of Jupiter. The planet formed a mere 12 million years ago—a newborn in planet lifetimes.

It was identified from its faint and unique heat signature by the Pan-STARRS 1 (PS1) wide-field survey telescope on Haleakala, Maui. Follow-up observations using other telescopes in Hawaii show that it has properties similar to those of gas-giant planets found orbiting around young stars. And yet PSO J318.5-22 is all by itself, without a host star.

"We have never before seen an object free-floating in space that that looks like this. It has all the characteristics of young planets found around other stars, but it is drifting out there all alone,” explained team leader Dr. Michael Liu of the Institute for Astronomy at the University of Hawaii at Manoa. “I had often wondered if such solitary objects exist, and now we know they do.”

During the past decade, extrasolar planets have been discovered at an incredible pace, with about a thousand found by indirect methods such as wobbling or dimming of their host stars induced by the planet. However, only a handful of planets have been directly imaged, all of which are around young stars (less than 200 million years old). PSO J318.5-22 is one of the lowest-mass free-floating objects known, perhaps the very lowest. But its most unique aspect is its similar mass, color, and energy output to directly imaged planets.

“Planets found by direct imaging are incredibly hard to study, since they are right next to their much brighter host stars. PSO J318.5-22 is not orbiting a star so it will be much easier for us to study. It is going to provide a wonderful view into the inner workings of gas-giant planets like Jupiter shortly after their birth,” said Dr. Niall Deacon of the Max Planck Institute for Astronomy in Germany and a co-author of the study.

PSO J318.5-22 was discovered during a search for the failed stars known as brown dwarfs. Due to their relatively cool temperatures, brown dwarfs are very faint and have very red colors. To circumvent these difficulties, Liu and his colleagues have been mining the data from the PS1 telescope. PS1 is scanning the sky every night with a camera sensitive enough to detect the faint heat signatures of brown dwarfs. PSO J318.5-22 stood out as an oddball, redder than even the reddest known brown dwarfs.

“We often describe looking for rare celestial objects as akin to searching for a needle in a haystack. So we decided to search the biggest haystack that exists in astronomy, the dataset from PS1,” said Dr. Eugene Magnier of the Institute for Astronomy at the University of Hawaii at Manoa and a co-author of the study. Dr. Magnier leads the data processing team for PS1, which produces the equivalent of 60,000 iPhone photos every night. The total dataset to date is about 4,000 Terabytes, bigger than the sum of the digital version of all the movies ever made, all books ever published, and all the music albums ever released.

The team followed up the PS1 discovery with multiple telescopes on the summit of Mauna Kea on the island of Hawaii. Infrared spectra taken with the NASA Infrared Telescope Facility and the Gemini North Telescope showed that PSO J318.5-22 was not a brown dwarf, based on signatures in its infrared light that are best explained by it being young and low-mass.

By regularly monitoring the position of PSO J318.5-22 over two years with the Canada-France-Hawaii Telescope, the team directly measured its distance from Earth. Based on this distance, about 80 light-years, and its motion through space, the team concluded that PSO J318.5-22 belongs to a collection of young stars called the Beta Pictoris moving group that formed about 12 million years ago. In fact, the eponymous star of the group, Beta Pictoris, has a young gas-giant planet in orbit around it. PSO J318.5-22 is even lower in mass than the Beta Pictoris planet and probably formed in a different fashion.

• arXiv.org > astro-ph > arXiv:1310.0457 > 01 Oct 2013

A Strange Lonely Planet Found without a Sun.

• IN Xanadu did Kubla Khan
  A stately pleasure-dome decree:
  Where ALF, the sacred river, ran
  Through caverns measureless to man
  Down to a sunless sea.

http://alf.wikia.com/wiki/Melmac_%28planet%29 wrote:

[img3="Gordon "ALF" Shumway from the lonely planet Melmac"]http://upload.wikimedia.org/wikipedia/e ... humway.png[/img3]

"Melmac was the name of my planet. It's also what it was made out of" ― ALF

<<Melmac was a strange planet located in the Aldente Nebula in the Andromeda Galaxy. It was the homeworld of ALF. Residents of the planet were called Melmacians and they were characterized as being short, furry creatures who have advanced age longevity and multiple stomachs. Melmac was located six parsecs past the Hydra-Centaurus Supercluster. Melmac was very much like Earth but it had two moons, it was oddly shaped and made of melmac. Melmac had green skies and blue grass, and it orbited a purple sun. Melmac's national pastime was mining for yogurt. The planet was once the intergalactic convention site for the Federation of Incredibly Strange Food Groups. Melmac was destroyed on Gary 71st, 45-7, according to the Melmacian Calendar (1985 on the Earth calendar), although ALF claims his planet exploded on his birthday (28th of Nathanganger), due to nuclear war. ALF wandered through space for a year before crash landing on Earth.>>

CygnusOB2 wrote:It's risky to try and predict events well before they've had chance to happen, but I'm confident that ESA's Gaia Space Telescope will be able to find many more of these objects relatively nearby in our galaxy, in addition to a host of 'regular' exoplanets ... & no I'm not talking about Niburu !