A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn
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Authors
Fender, R.
Anderson, Gemma
Osten, R.
Staley, T.
Rumsey, C.
Grainge, K.
Saunders, R.
Date
2014Type
Journal Article
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Fender, R. and Anderson, G. and Osten, R. and Staley, T. and Rumsey, C. and Grainge, K. and Saunders, R. 2014. A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn. Monthly Notices of the Royal Astronomical Society: Letters. 446 (1): pp. L66-L70.
Source Title
Monthly Notices of the Royal Astronomical Society: Letters
ISSN
School
Curtin Institute of Radio Astronomy (Physics)
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Abstract
On 2014 April 23, the Swift satellite detected a gamma-ray superflare from the nearby star system DG CVn. This system comprises an M-dwarf binary with extreme properties: it is very young and at least one of the components is a very rapid rotator. The gamma-ray superflare is one of only a handful detected by Swift in a decade. As part of our AMI-LA Rapid Response Mode, ALARRM, we automatically slewed to this target, were taking data at 15 GHz within 6 min of the burst, and detected a bright (~100 mJy) radio flare. This is the earliest detection of bright, prompt, radio emission from a high-energy transient ever made with a radio telescope, and is possibly the most luminous incoherent radio flare ever observed from a red dwarf star. An additional bright radio flare, peaking at around 90 mJy, occurred around one day later, and there may have been further events between 0.1-1 d when we had no radio coverage. The source subsequently returned to a quiescent level of 2-3 mJy on a time-scale of about 4 d. Although radio emission is known to be associated with active stars, this is the first detection of large radio flares associated with a gamma-ray superflare, and demonstrates both feasibility and scientific importance of rapid response modes on radio telescopes. © 2014 The Authors.
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