Title:
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A remarkable recurrent nova in M 31: The predicted 2014 outburst in X-rays with Swift
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Author:
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Henze, Martin; Ness, J.; Darnley, M. J.; Bode, M. F.; Williams, S. C.; Shafter, A. W.; Sala Cladellas, Glòria; Kato, M.; Hachisu, I.; Hernanz Carbó, Margarita
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica |
Abstract:
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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. |
Subject(s):
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-Àrees temàtiques de la UPC::Física::Astronomia i astrofísica -Astrophysics -galaxies: individual: M 31 -novae -cataclysmic variables -X-rays: binaries -stars: individual: M31N 2008-12a -HYDROGEN-BURNING TURNOFF -RS OPHIUCHI 2006 -CLASSICAL NOVAE -CENTRAL REGION -SPECTRAL-ANALYSIS -OPTICAL NOVAE -LIGHT-CURVE -SPACED DATA -PHASE -TELESCOPE -Astrofísica |
Rights:
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http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Article |
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