The very short supersoft X-ray state of the classical nova M31N 2007-11a

M. Henze, W. Pietsch, G. Sala, M. Della Valle, M. Hernanz, J. Greiner, V. Burwitz, M. J. Freyberg, F. Haberl, D. H. Hartmann, P. Milne, George G Williams

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Context. Short supersoft X-ray source (SSS) states (durations ≤100 days) of classical novae (CNe) indicate massive white dwarfs that are candidate progenitors of supernovae type Ia.Aims. We carry out a dedicated optical and X-ray monitoring program of CNe in the bulge of M 31.Methods. We discovered M31N 2007-11a and determined its optical and X-ray light curve. We used the robotic Super-LOTIS telescope to obtain the optical data and XMM-Newton and Chandra observations to discover an X-ray counterpart to that nova.Results. Nova M31N 2007-11a is a very fast CN, exhibiting a very short SSS state with an appearance time of 6-16 days after outburst and a turn-off time of 45-58 days after outburst.Conclusions. The optical and X-ray light curves of M31N 2007-11a suggest a binary containing a white dwarf with MWD > 1.0 M .

Original languageEnglish (US)
Pages (from-to)L13-L16
JournalAstronomy and astrophysics
Issue number2
StatePublished - May 2009


  • Galaxies: individual: M31
  • Novae, cataclysmic variables
  • Stars: individual: nova M31N 2007-11a-X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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