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

被引：23

作者：

Henze, M. ^{[1
]}

Ness, J. -U. ^{[1
]}

Darnley, M. J. ^{[2
]}

Bode, M. F. ^{[2
]}

Williams, S. C. ^{[2
]}

Shafter, A. W. ^{[3
]}

Sala, G. ^{[4
,5
]}

Kato, M. ^{[6
]}

Hachisu, I. ^{[7
]}

Hernanz, M. ^{[8
]}

机构：

[1] European Space Astron Ctr, Madrid 28692, Spain

[2] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England

[3] San Diego State Univ, Dept Astron, San Diego, CA 92182 USA

[4] Univ Politecn Cataluna, EUETIB, Dept Fis & Engn Nucl, Barcelona 08036, Spain

[5] Inst Estudis Espacials Catalunya, Barcelona 08034, Spain

[6] Keio Univ, Dept Astron, Yokohama, Kanagawa 2238521, Japan

[7] Univ Tokyo, Coll Arts & Sci, Dept Earth Sci & Astron, Meguro Ku, Tokyo 1538902, Japan

[8] Inst Ciencies Espai CSIC IEEC, Cerdanyola Del Valles 08193, Spain

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 580卷

基金：

日本学术振兴会; 美国国家科学基金会;

关键词：

galaxies: individual: M 31; novae; cataclysmic variables; X-rays: binaries; stars: individual: M31N 2008-12a; CLASSICAL NOVAE; CENTRAL REGION; SPECTRAL-ANALYSIS; OPTICAL NOVAE; LIGHT-CURVE; PHASE; ATMOSPHERES; ABSORPTION; MODELS; AUTUMN;

D O I：

10.1051/0004-6361/201526028

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：12

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