First Mini Me Solar System Found, Huge Planet Orbits Tiny Brown Dwarf Star
This artist’s conception shows the relative size of a hypothetical brown dwarf-planetary system compared to our own solar system. A brown dwarf is a cool or “failed” star, which lacks the mass to ignite and shine like our Sun. NASA’s Spitzer Space Telescope set its infrared eyes on an extraordinarily low-mass brown dwarf called OTS 44 and found a swirling disk of planet-building dust. At only 15 times the mass of Jupiter, OTS 44 is the smallest known brown dwarf to host a planet-forming, or protoplanetary, disk.
Image Credit: NASA/JPL-Caltech/T. Pyle (SSC)
Astrophysicists have presented the discovery of a planetary-mass object orbiting a field brown dwarf via gravitational microlensing, OGLE-2012-BLG-0358Lb. The system is a low secondary/primary mass ratio (0.080 +- 0.001), relatively tightly-separated (~0.87 AU) binary composed of a planetary-mass object with 1.9 +- 0.2 Jupiter masses orbiting a brown dwarf with a mass 0.022 M_Sun. The relatively small mass ratio and separation suggest that the companion may have formed in a protoplanetary disk around the brown dwarf host, in a manner analogous to planets.
Previously there was no evidence that the formation of brown dwarfs also had orbiting planets. However, this deficiency was mainly based on the fact that brown dwarfs are difficult to observe because they are extremely faint and so also any existing planets making identification with the classical methods of planet detection even more difficult.
For this reason, astronomers used an entirely different search method, called gravitational lensing to search for planets around a brown dwarf. Gravitational lensing occurs when a celestial body passes in front of another and its gravity focuses the light of the background object toward Earth. This method has the advantage that it works regardless of the brightness of the body. The method was used by C. Han of the Korean Chungbuk National University and astronomers from the Max Planck Institute for Solar System Research. Their results are current published in “Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf.“
The brown dwarf that the researchers currently have examined is about 6,000 light-years away from Earth and resides in the constellation Scorpio. The astronomers became aware of variations in brightness of the dwarf star for the first time in April 2012 and were able to ensure by further observations, it was indeed a gravitational lens effect.
Based on the data the scientists conclude that the brown dwarf is orbited by a planet about has twice the mass of our Jupiter and is less than one astronomical unit (AU = distance Sun-Earth) from the star it orbits. The brown dwarf itself is about ten times larger than its planetary companion.
There is still debate as to whether the brown dwarf captured it planets or if they formed in a planetary disk around the star.
Dr Evil and Mini Me from the Austin Powers film from which the new solar system derives its comparison.
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