AND PLANET MAKES THREE: Kepler 16 b orbits a pair of stars, as shown in this artist's depiction of the system.
Image: NASA/JPL-Caltech
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The hundreds of distant worlds, some large and some small, that are known to dot the galaxy provide plenty of intrigue for the scientists who hunt them. But the catalogued planetary population has just gotten a lot larger and more diverse, thanks to word this week of a newly identified planet orbiting two suns, more than a dozen newfound "super-Earths," and strong indications that the Milky Way Galaxy is home to an almost unfathomable number of planets awaiting discovery.
More than 350 researchers from around the globe gathered at the Extreme Solar Systems (ESS) II conference in Grand Teton National Park, Wyo., to share their findings on these newfound exoplanets, or planets outside our solar system, of every size and configuration.
The most exotic of the latest batch of exoplanets is the world with two suns, like Tatooine of Star Wars or Dr. Who's Gallifrey. The planet, named Kepler 16 b for the NASA Kepler spacecraft that spotted it, revolves around two stars locked in a tight binary pairing; the planet's wide, nearly circular orbit keeps it well outside the stars' orbital dance. The trio is not the only so-called circumbinary system known, but it is the first for which researchers have been able to measure the properties of both stars and the planet so precisely, and the first system where the planet has been directly detected, rather than inferred. [Read more about other planets Kepler has found.]
The researchers, led by Laurance Doyle of the SETI Institute in Mountain View, Calif., announced the finding at the ESS conference and with a September 15 press conference in California that included a visual-effects supervisor from Lucasfilm, the makers of Star Wars. Doyle, Joshua Carter of the Harvard–Smithsonian Center for Astrophysics (CfA), and their colleagues also described the Kepler 16 system in a study in the September 16 issue of Science.
Kepler 16 b is reminiscent of Saturn in its dimensions and mass, but slightly denser, implying that its makeup skews more to elements heavier than hydrogen and helium. The giant planet orbits its parent stars every 229 Earth days. As curious as Kepler 16 b is, the stellar binary that hosts it is noteworthy as well. The smaller of the two stars is just one fifth the mass of our sun, making it the smallest main-sequence star whose physical properties are well known.
"We thought we understood stellar evolution for a long time, but when you get to the end of the main sequence," the data do not fit the models, Doyle says. "Now any kind of excuse of 'you’re not measuring very well' goes out the window. This one, we nailed."
The astronomical oddball was not the only news from the Kepler mission at the ESS meeting. Sarah Ballard, a CfA graduate student and member of the Kepler team, described on September 12 a newly uncovered pair of planets orbiting the star Kepler 19.
Kepler 19 b, only twice as Earth's diameter, is among the smallest exoplanets known to date. But it is likely a miserable place: at just 13.5 million kilometers from its host star, the planet's surface is likely a toasty 480 degrees Celsius.
The Kepler spacecraft detects planets such as Kepler 19 b by watching them dim the light of their host star as the planets pass in front, or "transit." Ordinarily, those transits will occur at regular intervals, like celestial clockwork, but oddities in Kepler 19 b's transit times suggest the influence of the other half of the pair—a larger, unseen planet also orbiting Kepler 19 and perturbing the motion of its neighbor.
"This is uncharted waters," Ballard says. This is the first time that anomalies in the occurrence times of transits have been used to make a solid claim for the discovery of an alien world, she says. The unseen planet, Kepler 19 c, is still mysterious, Ballard notes, adding that it "could be a rocky planet on a five-day orbit, or it could be a gas giant on an oblong, 100-day orbit."
Kepler is hardly the only planet-finding campaign meeting with success and making news this week at the Wyoming confab. A search based at institutions in the U.K. and Spain, the Wide-Angle Search for Planets (WASP), reported the discovery of some two dozen new planets. And a European contingent from the High Accuracy Radial velocity Planet Searcher (HARPS) had an even bigger haul to unveil.
There seem to be plenty of targets to go around: most of the tens of billions of yellow-orange stars in the galaxy might harbor planets, new HARPS data suggest. Previous HARPS results had implied that up to half of these stars could have planets, but a new statistical analysis shows the percentage to be even higher, about 70 percent, Francesco Pepe of the Observatory of Geneva in Switzerland said during a press conference announcing the HARPS results on September 12.
The HARPS team announced about 50 new planets, of which 16 are super-Earths—planets larger than our own but smaller than Neptune or Uranus. Statistical models suggest that four in 10 stars harbor super-Earths. One of the newfound HARPS planets, HD 85512 b, orbits on the edge of the habitable zone, a temperate band surrounding a star where temperatures could support liquid water and just maybe extraterrestrial life.
HARPS is an instrument that measures the wobble caused by a planet's gravitational tug on its host star, so it can be used to estimate planetary mass. It is not able to measure the diameter of planets, so these "super-Earths" could be large and gaseous, like Neptune, or small and rocky, like Earth, the researchers say.
Studying super-Earths is a particularly fruitful area of planetary science, says David Latham of the CfA, who was not involved in the HARPS work. "It's a kind of planet we don't have in our own system," he says. In fact, the existence of super-Earths has come to light only in the past few years.
Between the super-Earths, the circumbinary planet, and the dozens of other new discoveries, researchers are now turning up exoplanets in unprecedented numbers. "We are really in the age of discovery of new worlds," said Lisa Kaltenegger of the Max Planck Institute for Astronomy in Heidelberg, Germany, and the CfA during the press conference.
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13 Comments
Add CommentStar Wars and Dr. Who references I would expect from the mainstream press. From Scientific American? Perhaps Asimov's classic, "Nightfall." Some of your readers might still (dare I suggest it?) . . . read.
Reply | Report Abuse | Link to thisNobody now! This is speculation.
Reply | Report Abuse | Link to thisGive me scientific facts and i belive.
Nobody now! This is speculation.
Reply | Report Abuse | Link to thisGive me scientific facts and i belive.
Maybe this planets have one sun.
Reply | Report Abuse | Link to thisMaybe aren t suns, but diferents planets.
What you think?
Our notion of planets like solar system maybe wrong.
This system it can be diferent!
But if someone give me scientific facts i belive!
I'm finding increasing evidence that our own solar system also began as a close binary pair that merged in a luminous red nova at 4.567 Ga. This may have created the short-lived radionuclides of our early solar system by spallation while enriching the sun in s-process stable isotopes.
Reply | Report Abuse | Link to thisThe Oort Cloud comet clusters may have formed like the "string of cosmic pearls" surrounding SN 1987A as the shockwave cooled and condensed into gravitationally bound dust clouds at about 50,000 AU.
During the brief, expanded red giant phase of the LRN the terrestrial planets (originally composed of highly-oxidized presolar CI chondrite material) may have been enveloped by the sun and ravaged by solar plasma that burned off volatiles and reduced metal oxides to their base elements, creating reduced-iron cores in the terrestrial planets in a "terrestrial-planet reduction event". The asteroid planetesimals were reduced to metallic cinders.
http://hillscloud.wordpress.com
the comets carry litle particles.
Reply | Report Abuse | Link to thisThe universe are change and i see the discovery of the litle planets in our solar system.
I remember when hubbes discovery one litle satellite of pluto.
The asteroids of olds planets and comets conversion in the new planets (the germ of life)
How appear the life in our planets?
The comets fall and the germ of another planets to do rest. The earth have the conditions for life grow!
But this "new Wolrd" have two suns...I ask, if the news super earth, have the same conditions?
I like know your opinion.
Texas Governor Rick Perry and his "Tea Party" science deniers might like to read and comment on this discovery. Why not send Rick a complimentary copy ? I would like more scientists to go beyond their customary reserve and start getting into the faces of political and media phonies like Perry, Michele Bachmann, Sarah Palin, Ron Paul, and Rush Limbaugh. An occasional reading of the Hightower Lowdown might help many of the heretofore non committal in the scientific community to overcome their reticence. If scientists truly believe their ideas and findings, they should be willing to defend them against the loud-mouths who try to disparage those ideas, findings, theories and discoveries that don't support certain political and religious beliefs.
Reply | Report Abuse | Link to thisFascinating! The search for extra-terrestrial intelligence goes on as astronomer's intelligence is increasingly artificial. This particular mysterium cosmographicum, found by the epynomous avatar of 17th century planetary science, is yet another artifact of the search for the holy grail of another earth, which will be the ultimate technofix when we have ruined this one. With any luck, SpaceX will have their fleet ready to haul the billionaires off to the new planet while the res tof us wilt, drown, or choke to death. Ain't science wonderful!
Reply | Report Abuse | Link to thisIMHO, we need better commenters.
Reply | Report Abuse | Link to thisIncluding me.
Oh, what # sunblock will we need there?
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Reply | Report Abuse | Link to thisThe discovery of hundreds of exoplanet systems with an amazing variety of unexpected and unpredicted properties, such as "hot" Jupiters, planets orbiting pulsars, and planetary systems that defy the "rules" like the tightness of the Tatooine system, is telling us something.
When enough of these systems are discovered and their full repetoire of properties are catalogued, we will find that their properties are identical to the properties of highly excited atoms, technically Rydberg atoms, but scaled up according to the discrete self-similar transformation equations of Discrete Scale Relativity.
It's a fractal world.
Robert L. Oldershaw
http://www3.amherst.edu/~rloldershaw
Discrete Fractal Cosmology
It would seem that with all the debris in creating a cloud it would be normal too have planets. I was surprised that it was found in a binary system because I always thought the two stars would suck any excess matter between them leaving a void. Very interesting just watch out for death stars near by.
Reply | Report Abuse | Link to thisNobody read! This is speculation.
Reply | Report Abuse | Link to thisGive me scientific facts that you read and i belive.
(sorry, couldn't resist it)
Nobody now! This is speculation.Give me scientific facts and i belive.
Reply | Report Abuse | Link to thisExist many planets. We haven t technology to go there and study!
Maybe isn t two suns, maybe is two big stars die!
Whem we have scientific facts i give one real opinion!
But now i have the same opinion as "mkultra"