A remarkable recurrent nova in M 31: The X-ray observations
A remarkable recurrent nova in M 31: The X-ray observations
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M 31 中一颗引人注目的复发新星:X 射线观测
DOI:
10.1051/0004-6361/201423410
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发表时间:
2014
影响因子:
6.5
通讯作者:
Henze M
中科院分区:
文献类型:
--
作者:
Henze M
ContextAnother 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.AimsIn this Letter we address the X-ray properties of M31N 2008-12a.MethodsWe requestedSwiftmonitoring 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.ResultsThe 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 ~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.ConclusionsThe 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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DOI:
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发表时间:
2006
期刊:
影响因子:
--
作者:
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通讯作者:
Stella Seitz
DOI:
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发表时间:
2003
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DOI:
10.1088/0004-637x/727/2/124
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2010
期刊:
The Astrophysical Journal
影响因子:
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通讯作者:
S. Eyres
DOI:
10.1086/508063
发表时间:
2006-07
期刊:
The Astrophysical Journal Supplement Series
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
1993
期刊:
影响因子:
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作者:
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通讯作者:
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