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Swift observations of GW Lib : a unique insight into a rare outburst
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Byckling, K., Osborne, J. P., Wheatley, P. J., Wynn, G. A., Beardmore, A., Braito, V., Mukai, K. and West, Richard G. (2009) Swift observations of GW Lib : a unique insight into a rare outburst. Monthly Notices of the Royal Astronomical Society, Vol.399 (No.3). pp. 1576-1586. doi:10.1111/j.1365-2966.2009.15378.x
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2009.15378.x
Abstract
The second known outburst of the WZ Sge type dwarf nova GW Lib was observed in 2007 April. We have obtained unique multiwavelength data of this outburst which lasted similar to 26 days. The American Association of Variable Star Observers (AAVSO) recorded the outburst in the optical, which was also monitored by Wide Angle Search for Planets, with a peak V magnitude of similar to 8. The outburst was followed in the ultraviolet and X-ray wavelengths by the Swift ultraviolet/optical and X-ray telescopes. The X-ray flux at optical maximum was found to be three orders of magnitude above the pre-outburst quiescent level, whereas X-rays are normally suppressed during dwarf nova outbursts. A distinct supersoft X-ray component was also detected at optical maximum, which probably arises from an optically thick boundary layer. Follow-up Swift observations taken 1 and 2 years after the outburst show that the post-outburst quiescent X-ray flux remains an order of magnitude higher than the pre-outburst flux. The long interoutburst time-scale of GW Lib with no observed normal outbursts support the idea that the inner disc in GW Lib is evacuated or the disc viscosity is very low.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
| Publisher: | Wiley | ||||
| ISSN: | 0035-8711 | ||||
| Official Date: | 1 November 2009 | ||||
| Dates: |
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| Volume: | Vol.399 | ||||
| Number: | No.3 | ||||
| Number of Pages: | 11 | ||||
| Page Range: | pp. 1576-1586 | ||||
| DOI: | 10.1111/j.1365-2966.2009.15378.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | European Commission, STFC | ||||
| Grant number: | MEST-CT-2004-007512 |
Data sourced from Thomson Reuters' Web of Knowledge
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