Swift observations of the X-ray and UV evolution of V2491 Cyg (Nova Cyg 2008 No. 2)

Details Swift observations of the X-ray and UV evolution of V2491 Cyg (Nova Cyg 2008 No. 2) Swift observations of the X-ray and UV evolution of V2491 Cyg (Nova Cyg 2008 No. 2)

2009-09-08

arxiv.org/abs/0909.1501v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

12 pages, 8 figure (2 in colour), accepted for publication in MNRAS

Scientific paper

We present extensive, high-density Swift observations of V2491 Cyg (Nova Cyg 2008 No. 2). Observing the X-ray emission from only one day after the nova discovery, the source is followed through the initial brightening, the Super-Soft Source phase and back to the pre-outburst flux level. The evolution of the spectrum throughout the outburst is demonstrated. The UV and X-ray light-curves follow very different paths, although changes occur in them around the same times, indicating a link between the bands. Flickering in the late-time X-ray data indicates the resumption of accretion. We show that if the white dwarf is magnetic, it would be among the most magnetic known; the lack of a periodic signal in our later data argues against a magnetic white dwarf, however. We also discuss the possibility that V2491 Cyg is a recurrent nova, providing recurrence timescale estimates.

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