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  • 1504.06237v1

    Rights statement: The final, definitive version of this article has been published in the Journal, Astronomy & Astrophysics, 580 2015, © EDP Sciences

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A remarkable recurrent nova in M 31: the predicted 2014 outburst in X-rays with Swift

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  • M. Henze
  • J.-U. Ness
  • M. J. Darnley
  • M. F. Bode
  • S. C. Williams
  • A. W. Shafter
  • G. Sala
  • M. Kato
  • I. Hachisu
  • M. Hernanz
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Article number46
<mark>Journal publication date</mark>1/08/2015
<mark>Journal</mark>Astronomy and Astrophysics
Volume580
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Context. The M 31 nova M31N 2008-12a was recently found to be a recurrent nova (RN) with a recurrence time of about one year. This is by far the fastest recurrence time scale of any known RN.
Aims: Our optical monitoring programme detected the predicted 2014 outburst of M31N 2008-12a in early October. We immediately initiated an X-ray/UV monitoring campaign with Swift to study the multiwavelength evolution of the outburst.
Methods: We monitored M31N 2008-12a with daily Swift observations for 20 days after discovery, covering the entire supersoft X-ray source (SSS) phase.
Results: We detected SSS emission around day six after outburst. The SSS state lasted for approximately two weeks until about day 19. M31N 2008-12a was a bright X-ray source with a high blackbody temperature.
Conclusions: The X-ray properties of this outburst are very similar to the 2013 eruption. Combined X-ray spectra show a fast rise and decline of the effective blackbody temperature. The short-term X-ray light curve showed strong, aperiodic variability which decreased significantly after about day 14. Overall, the X-ray properties of M31N 2008-12a are consistent with the average population properties of M 31 novae. The optical and X-ray light curves can be scaled uniformly to show similar time scales to those of the Galactic RNe U Sco or RS Oph. The SSS evolution time scales and effective temperatures are consistent with a high-mass WD. We predict the next outburst of M31N 2008-12a to occur in Oct.-Dec. 2015.

Bibliographic note

The final, definitive version of this article has been published in the Journal, Astronomy & Astrophysics, 580 2015, © EDP Sciences