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Spectroscopic Confirmation of the 2015 Eruption of Recurrent Nova M31N 1963-09c

ATel #8242; S. C. Williams (LJMU), M. J. Darnley (LJMU), M. Henze (IEEC/CSIC), A. W. Shafter (SDSU), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic)
on 3 Nov 2015; 19:38 UT
Credential Certification: Matt Darnley (M.J.Darnley@ljmu.ac.uk)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 8243, 8290, 8587

We obtained an optical spectrum of the 2015 eruption of recurrent nova M31N 1963-09c (see ATel #8233, #8234, #8235, #8238 and CBAT TOCP) using the SPRAT spectrograph on the Liverpool Telescope (Steele et al. 2004) on 2015 November 2.93 UT.

The spectrum shows extremely broad Balmer, He I, N II and N III emission features. These emission lines are typical of novae belonging the the He/N spectroscopic class. The Hα line shows a double-peaked structure and we measure its FWHM to be ~ 7500 km/s. This 2015 spectrum appears similar to that of the 2010 eruption of M31N 1963-09c (ATel #3006), confirming that this is indeed another eruption of the recurrent nova.