Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables
Accreting white dwarfs in binary systems known as cataclysmic variables (CVs) have in recent years been shown to produce radio flares during outbursts, qualitatively similar to those observed from neutron star and black hole X-ray binaries, but their ubiquity and energetic significance for the accre...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
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OXFORD UNIV PRESS
2019
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/90026 |
| _version_ | 1848765313422721024 |
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| author | Fender, R. Bright, J. Mooley, K. Miller-Jones, James |
| author_facet | Fender, R. Bright, J. Mooley, K. Miller-Jones, James |
| author_sort | Fender, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Accreting white dwarfs in binary systems known as cataclysmic variables (CVs) have in recent years been shown to produce radio flares during outbursts, qualitatively similar to those observed from neutron star and black hole X-ray binaries, but their ubiquity and energetic significance for the accretion flow has remained uncertain. We present new radio observations of the CV SS Cyg with Arcminute Microkelvin Imager Large Array, which show for the second time late-ouburst radio flaring, in 2016 April. This flaring occurs during the optical flux decay phase, about 10 d after the well-established early-time radio flaring. We infer that both the early- and late-outburst flares are a common feature of the radio outbursts of SS Cyg, albeit of variable amplitudes, and probably of all dwarf novae. We furthermore present new analysis of the physical conditions in the best-sampled late-outburst flare, from 2016 February, which showed clear optical depth evolution. From this we can infer that the synchrotron-emitting plasma was expanding at about 1 per cent of the speed of light, and at peak had a magnetic field of order 1 G and total energy content ≥1033 erg. While this result is independent of the geometry of the synchrotron-emitting region, the most likely origin is in a jet carrying away a significant amount of the available accretion power. |
| first_indexed | 2025-11-14T11:33:16Z |
| format | Journal Article |
| id | curtin-20.500.11937-90026 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:33:16Z |
| publishDate | 2019 |
| publisher | OXFORD UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-900262023-02-07T03:04:19Z Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables Fender, R. Bright, J. Mooley, K. Miller-Jones, James Science & Technology Physical Sciences Astronomy & Astrophysics ISM: jets and outflows X-RAY ACCRETION JET STATES STARS Accreting white dwarfs in binary systems known as cataclysmic variables (CVs) have in recent years been shown to produce radio flares during outbursts, qualitatively similar to those observed from neutron star and black hole X-ray binaries, but their ubiquity and energetic significance for the accretion flow has remained uncertain. We present new radio observations of the CV SS Cyg with Arcminute Microkelvin Imager Large Array, which show for the second time late-ouburst radio flaring, in 2016 April. This flaring occurs during the optical flux decay phase, about 10 d after the well-established early-time radio flaring. We infer that both the early- and late-outburst flares are a common feature of the radio outbursts of SS Cyg, albeit of variable amplitudes, and probably of all dwarf novae. We furthermore present new analysis of the physical conditions in the best-sampled late-outburst flare, from 2016 February, which showed clear optical depth evolution. From this we can infer that the synchrotron-emitting plasma was expanding at about 1 per cent of the speed of light, and at peak had a magnetic field of order 1 G and total energy content ≥1033 erg. While this result is independent of the geometry of the synchrotron-emitting region, the most likely origin is in a jet carrying away a significant amount of the available accretion power. 2019 Journal Article http://hdl.handle.net/20.500.11937/90026 10.1093/mnrasl/slz145 English http://purl.org/au-research/grants/arc/FT140101082 OXFORD UNIV PRESS fulltext |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics ISM: jets and outflows X-RAY ACCRETION JET STATES STARS Fender, R. Bright, J. Mooley, K. Miller-Jones, James Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables |
| title | Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables |
| title_full | Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables |
| title_fullStr | Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables |
| title_full_unstemmed | Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables |
| title_short | Late-outburst radio flaring in SS Cyg and evidence for a powerful kinetic output channel in cataclysmic variables |
| title_sort | late-outburst radio flaring in ss cyg and evidence for a powerful kinetic output channel in cataclysmic variables |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics ISM: jets and outflows X-RAY ACCRETION JET STATES STARS |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/90026 |