A remarkable recurrent nova in M 31: The X-ray observations

被引：37
|
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 ]
Kato, M. [4 ]
Hachisu, I. [5 ]
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] Keio Univ, Dept Astron, Yokohama, Kanagawa 2238521, Japan
[5] Univ Tokyo, Coll Arts & Sci, Dept Earth Sci & Astron, Meguro Ku, Tokyo 1538902, Japan
来源：
ASTRONOMY & ASTROPHYSICS | 2014年 / 563卷
基金：
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; ACCRETING WHITE-DWARFS; CLASSICAL NOVAE; OPTICAL NOVAE; M31N; 2007-12B; IA SUPERNOVAE; TELESCOPE; HYDROGEN; PHASE; ABSORPTION; DISTANCE;
D O I：
10.1051/0004-6361/201423410
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Context. Another outburst of the recurrent M 31 nova M31N 2008-12a was announced in late November 2013. Optical data suggest an unprecedentedly short recurrence time of approximately one year. Aims. In this Letter we address the X-ray properties of M31N 2008-12a. Methods. We requested Swift monitoring observations shortly after the optical discovery. We estimated source count rates and extracted X-ray spectra from the resulting data. The corresponding ultraviolet (UV) data were also analysed. Results. The nova M31N 2008-12a was clearly detected as a bright supersoft X-ray source (SSS) only six days after the well-constrained optical discovery. It displayed a short SSS phase of two weeks' duration and an exceptionally hot X-ray spectrum with an effective black-body temperature of similar to 97 eV. During the SSS phase the X-ray light curve displayed significant variability that might have been accompanied by spectral variations. The very early X-ray variability was found to be anti-correlated with simultaneous variations in the UV flux. Conclusions. The X-ray properties of M31N 2008-12a coherently point towards a high-mass white dwarf in the nova system. This object might be a promising Type Ia supernova progenitor. We rediscovered additional X-ray detections of M31N 2008-12a that are consistent with our data and increase the number of known nova outbursts to seven. This nova is an exceptional object that merits further attention in the future.
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页数：5
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