The Arecibo Telescope in Puerto Rico has discovered sporadic bursts of polarized radio emission from the T6.5 brown J1047+21.
Because Arecibo is a single, fixed-dish telescope, it has a restricted practical sensitivity to weak, quiescent emission from radio sources.
This new discovery demonstrates that brown dwarfs that are not much hotter than giant planets are still capable of generating observable radio emission.
J1047+21 was observed as part of Arecibo's ongoing survey of a sample of the coolest brown dwarfs visible from Arecibo, in search
of rapidly varying, polarized radio emission from these objects.
Bursts from J1047+21 were detected three times in fifteen monitoring observations spread over a thirteen month period, each observing session lasting 1.5-2 hours.
Properties of the 4.75 GHz radio emission from J1047+21 are broadly similar to those observed in bursts from other ultracool dwarfs.
No binary companion to J1047+21 has been detected. Although scientists do not eliminate the possibility that J1047+21 has a very close companion,
it appears that, in absence of any spectroscopic or photometric evidence of binarity of this object, it is reasonable to assume its solitary character.
This discovery gives scientists hope they will also be able to detect radio emissions from young, low mass brown dwarfs and massive exoplanets near J1047+21.
Radio detection provides unique means to measure and study magnetic fields of the coolest brown dwarfs.
The fact that an object like J1047+21 is capable of generating observable, coherent radio emission, despite its very low, _900 K temperature,
demonstrates the feasibility of studies of brown dwarfs using radio detection as a tool.
A very cool brown dwarf. Credit: Douglas Pierce-Price, Joint Astronomy Centre, Hawaii
The Arecibo telescope is an excellent instrument for detection of rapidly varying, broadband, circularly polarized radio emission.
Normally, these radio emissions can be identified, but sometimes it happens that the telescope picks up a signal that simply cannot be identified for years.
This has happened on three different occasions when the telescope picked up
a mysterious signal coming from a region of space between
the constellations Pisces and Aries. This puzzling signal has until today remained unexplained and does not resemble any known astronomical phenomenon.
This raises the question if it is artificial in nature and perhaps broadcasted by an alien civilization?
Unusual Sounds From Space Reported Worldwide - What Are They?
For almost a year now people from different countries have reported hearing strange sound from the sky. Now scientists propose that what people are
hearing is only a small fraction of the actual power of these sounds!
What are these sounds? What is causing them? Are they in anyway related to our Sun and the biggest solar flares, do they come from Earth's inner core
or can they be attributed to an unknown an astronomical phenomenon? Are they in anyway dangerous to our planet?
Unknown Force "Intelligently" Put Together Miranda Moon - with video
What could melt this moon in this extremely cold region of the solar system?
Voyager 2 passed Miranda’s strange world at a distance of only 3,000 kilometers (1,800 miles) and
sent back to Earth very detailed images of its "tortured" surface.
Nothing like them has been seen anywhere else in the solar system! Did a type III civilization conduct some "experiments" on Miranda?