Confirmation of PNV J00422137+4113004 as a classical nova
ATel #5260; Y. Cao (Caltech), S. Tang (Caltech/UCSB), M. M. Kasliwal (Carnegie/Princeton), S. B. Cenko (NASA/GSFC), K. I. Clubb (Berkeley) on behalf of the iPTF collaboration
on 9 Aug 2013; 08:02 UT
Credential Certification: Yi Cao (ycao@astro.caltech.edu)
We report a detection of the optical counterpart (internal name: iPTF13cpb)
of J00422137+4113004 (ATel#5256) from the iPTF daily monitoring of M31. The
transient had a magnitude of r=16.8 at MJD=56511.290. Nothing was found at
the same location down to r=20.9 at MJD=56510.325. Photometry is calibrated
to the SDSS catalog.
We obtained a spectrum of iPTF13cpb with the Kast Double Spectrograph on the
Shane 3-m Telescope at Lick Observatory. Its spectrum shows weak continuum
superposed by strong emission lines, including Balmer series, O I 7773,
O I 8446, O I 9264, He I 5876, He I 6678, He I 7065 and Fe II bands
between 4900A
and 5500A. The broad emission feature around 4640A may be explained as blended
He I 4472, He II 4542, N III 4640 and He II 4686. All emission lines
have double-peaked
profiles. The FWHM of Halpha is about 5000 km/s. The spectrum confirms that
iPTF13cpb is a classical nova, similar to Scuti 91 (Williams et al.,
1994, ApJS, 90, 297).
