Asiago classification of PSN J10543413+5417569 as a young type-IIn supernova

ATel #5767; P. Ochner, A. Siviero, L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, A. Pastorello, L. Tartaglia, G. Terreran, M. Turatto (INAF - Osservatorio Astronomico di Padova)
on 15 Jan 2014; 15:10 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

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We report that an optical spectrogram (range 360-790 nm; resolution 0.8 nm) of PSN J10543413+5417569 obtained on Jan. 15.13 UT with the Asiago 1.22-m Galileo Telescope (+ Boller & Chivens spectrograph), shows that it is type-IIn supernova soon after the explosion. A very good match is found with the spectrum of the type-IIn supernova 2013cj.

The spectrum is dominated by hydrogen Balmer lines emission, consisting of unresolved narrow components (FWHM < 550 km/s as measured for Halpha) on broader wings (FWHM about 3400 km/s again for Halpha). An unusually strong He II 468.6 nm is also visible, together with weaker He I lines. Given the redshift of the parent galaxy NGC 3448 (z about 0.004503, de Vaucouleurs et al. 1991, RC3.9, via NED) and the magnitude at discovery, the derived absolute magnitude for this event is about -15.8.

The Asiago classification spectra are posted at website URL http://sngroup.oapd.inaf.it ; classification was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).

Padova-Asiago SN group