MessageToEagle.com -
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
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MessageToEagle.com -
The Arecibo Telescope in Puerto Rico has discovered sporadic bursts of polarized radio emission from the T6.5 brown J1047+21.
