The Arecibo Detection of the Coolest Radio-flaring Brown Dwarf

Details The Arecibo Detection of the Coolest Radio-flaring Brown Dwarf The Arecibo Detection of the Coolest Radio-flaring Brown Dwarf

2012-02-06

arxiv.org/abs/1202.1287v2

2012 ApJ 747 L22

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 2 figures. Accepted for publication in ApJL

Scientific paper

10.1088/2041-8205/747/2/L22

Radio detection provides unique means to measure and study magnetic fields of the coolest brown dwarfs. Previous radio surveys have observed quiescent and flaring emission from brown dwarfs down to spectral type L3.5, but only upper limits have been established for even cooler objects. We report the detection of sporadic, circularly polarized flares from the T6.5 dwarf, 2MASS J1047+21, with the Arecibo radio telescope at 4.75 GHz. This is by far the coolest brown dwarf yet detected at radio frequencies. The fact that such an object is capable of generating observable, coherent radio emission, despite its very low, ~900 K temperature, demonstrates the feasibility of studies of brown dwarfs in the meagerly explored LTY spectral range, using radio detection as a tool.

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