Posted on 04/21/2016 10:25:04 AM PDT by Red Badger
Artistic representation of the potentially habitable super-Earth Gliese 832c against a stellar nebula background. Credit: PHL @ UPR Arecibo, NASA Hubble, Stellarium.
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An Earth-like planet may be lurking in a star system located just 16 light years away, according to a new research. The star, named Gliese 832, was recently investigated by a team of astronomers searching for additional exoplanets that may be residing between the two currently known alien worlds in this system. A paper detailing the finding was published online on Apr. 15 in the arXiv journal.
Gliese 832 is a red dwarf and has just under half the mass and radius of our sun. The star is orbited by a giant Jupiter-like exoplanet designated Gliese 832b and by a super-Earth mass planet Gliese 832c. The gas giant, with a mass of 0.64 Jupiter masses, is orbiting the star at a distance of 3.53 AU, while the other planet is potentially a rocky world, around five times more massive than the Earth, residing very close its host star—about 0.16 AU.
Now, a team of astronomers, led by Suman Satyal of the University of Texas at Arlington, has reanalyzed the available data on this nearby planetary system hoping to find more extrasolar worlds that may be located in a vast space between the two known planets. The researchers have conducted numerical simulations to check the possibility of existence of other celestial bodies around the red dwarf.
Gliese 832b and Gliese 832c were discovered by the radial velocity technique, from which the scientists extracted the orbital parameters by using the best-fit solutions. These parameters were used as the initial conditions for starting their simulations.
"We also used the integrated data from the time evolution of orbital parameters to generate the synthetic radial velocity curves of the known and the Earth-like planets in the system. Moreover, based on the maximum amplitude of the radial velocity curve obtained from the observation of the inner planet, the approximate mass and distance from the star for the Earth-like planet were computed using the radial velocity signature of the Keplerian motion," the researchers wrote in the paper.
The team's computations revealed that an additional Earth-like planet with a dynamically stable configuration may be residing at a distance ranging from 0.25 to 2.0 AU from the star. According to the measurements, this hypothetical alien world would probably be more massive than our planet with a mass between one to 15 Earth's masses.
"We obtained several radial velocity curves for varying masses and distances for the middle planet," the astronomers noted.
For instance, if the planet is located around one AU from the star, it has an upper mass limit of ten Earth masses and a generated radial velocity signal of 1.4 m/s. A planet with about the mass of the Earth at the same location would have radial velocity signal of only 0.14 m/s, thus much smaller.
In general, the existence of this possible planet is supported by long-term orbital stability of the system, orbital dynamics and the synthetic radial velocity signal analysis.
The scientists emphasized that their main goal was to provide a general idea to the observers of where and what to look for in this system. They concluded that a significantly large number of radial velocity observations, transit method studies, as well as the direct imaging are still needed to confirm the presence of possible new planets in the Gliese 832 system.
Explore further: Nearby super-Earth is best habitable candidate so far, astronomers say
More information: An Earth-Like Planet in GJ 832 System, arXiv:1604.04544 [astro-ph.EP] arxiv.org/abs/1604.04544
Abstract Stability of planetary orbits around GJ 832 star system, which contains inner (GJ 832c) and outer (GJ 832b) planets, is investigated numerically and the detailed phase-space analysis are performed.
The stability of the system is defined in terms of its lifetime, which is its survival time during the orbital integration period, and the maximum eccentricity, emax attained by the orbits during the evolution processes.
A special emphasis is given to the existence of stable orbits for an Earth-like planet that is injected between the inner and outer planets. Thus, numerical simulations are performed for three and four bodies in elliptical orbits (or circular for special cases), and a large number of initial conditions that covers the whole phase-space of the existing bodies are used.
The results presented in the phase-space maps for GJ 832c indicates the least deviation of the eccentricity from its nominal value, which is then used to determine its inclination regime. Also, the Earth-like planet displays stable orbital configurations for at least one billion years.
Then, the radial velocity curves based on the signature from the Keplerian motion are generated for the Earth-like planet to estimate its distance from the star and its mass-limit. The synthetic RV signal suggests that an additional planet (1M? ? mass ? 15M?) with dynamically stable configuration may be residing between 0.25 - 2.0 AU from the star. We have provided an estimated number of RV observations for the additional planet for further observational verification.
XO-Planet Ping!................................
Where can I get a ticket? I’ve had enough of libs, coexist, democrats, #BLM, LGBTWHATEVERS, islam, etc.
Uranus
The habitable zone for a red dwarf star is very, very close.
Close enough that the planet would be tidal locked so the same face is always facing the star.
Worse, red dwarf stars are quite variable and have lots of flares making temperatures vary wildly.
So they haven’t found another planet, only defining the parameters of where to look.
You might want to hold off rushing to a planet 5X larger than Earth, at least wait until anti-gravity units become portable ‘cause you are going to need one to get around and support the iron lung to keep you breathing.
The habitable zone for a red dwarf star is very, very close.
Close enough that the planet would be tidal locked so the same face is always facing the star.
Worse, red dwarf stars are quite variable and have lots of flares making temperatures vary wildly.
Flares, high radiation, constant red light ... what a few hundred rads between friends?
Couldn't resist, could you.
Well there are numerous Class M planets in the galaxy. And the inhabitants of those planets are humanoid. They all speak English. And the females are attractive to earth men such as Captain Kirk.
As the first mission passes Pluto....
Not the first time this has been in the news. It’s a safe bet to suppose that there are many planets in the universe with Earthlike qualities. I just hope that there is no Hillary Clinton on that planet.
“If the b@tch is green, there must be something wrong with the p****.” - Eddie Murphy (Delirious)
Anyone seen my Illudium Q-36 Explosive Space Modulator?
LOL!
I’ve been meaning to watch that actually.
Oh, dear, not this again.
IT'S A FLARE STAR, people. With powerful X-ray flares that can, that those distances, cleanse all life off any putative planet. Come. On. Stop grasping at straws.
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