A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn
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 de...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
Wiley-Blackwell Publishing Ltd.
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/52284 |
| _version_ | 1848758891340365824 |
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| author | Fender, R. Anderson, Gemma Osten, R. Staley, T. Rumsey, C. Grainge, K. Saunders, R. |
| author_facet | Fender, R. Anderson, Gemma Osten, R. Staley, T. Rumsey, C. Grainge, K. Saunders, R. |
| author_sort | Fender, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T09:51:11Z |
| format | Journal Article |
| id | curtin-20.500.11937-52284 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:51:11Z |
| publishDate | 2014 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-522842018-03-29T09:08:39Z A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn Fender, R. Anderson, Gemma Osten, R. Staley, T. Rumsey, C. Grainge, K. Saunders, R. 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. 2014 Journal Article http://hdl.handle.net/20.500.11937/52284 10.1093/mnrasl/slu165 Wiley-Blackwell Publishing Ltd. restricted |
| spellingShingle | Fender, R. Anderson, Gemma Osten, R. Staley, T. Rumsey, C. Grainge, K. Saunders, R. A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn |
| title | A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn |
| title_full | A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn |
| title_fullStr | A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn |
| title_full_unstemmed | A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn |
| title_short | A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn |
| title_sort | prompt radio transient associated with a gamma-ray superflare from the young m dwarf binary dg cvn |
| url | http://hdl.handle.net/20.500.11937/52284 |