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Asiago spectroscopic classification of SN2016aa in PGC 22658

ATel #8641; F. Ciabattari (Italian Supernova Search Search Project, ISSP), L. Tomasella, A. Pastorello, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, L. Tartaglia, G. Terreran, M. Turatto (INAF - Padova Astronomical Observatory), F. Briganti, M. Caimmi, P. Campaner, S. Donati, E. Mazzoni (ISSP)
on 5 Feb 2016; 16:32 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Enrico Cappellaro (enrico.cappellaro@oapd.inaf.it)

Subjects: Optical, Supernovae

We report the spectroscopic classification of SN2016aa in PGC 22658 through observations obtained with the 1.82-m Copernico Telescope in Asiago (+ AFOSC; range 340-820 nm, resolution 1.3 nm).

A low signal-to-noise spectrogram obtained on Jan 04.97 UT indicates that SN2016aa is a Type II SNe, a few weeks after the explosion. The redshift, as inferred from the narrow emission lines of the host galaxy, is z = 0.03.

Photometry was obtained with AFOSC on Jan. 04.98 UT, providing the following magnitudes (sloan, ABmag): g = 18.67+-0.05, 18.36 +- 0.05 18.28+-0.06. Addditional unfiltered photometry was obtained by amateur astronomers. This has been calibrated with USNO reference stars (V band), and the following magnitudes have been obtained: Jan 17.88 UT, 18.5 (0.5); Jan 19.96 UT, 18.5 (0.5); Jan 22.01 UT, 18.2 (0.2); Feb 4.10, 18.3 (0.2); Feb 4.95, 18.3 (0.2).

As the supernova magnitudes remained almost constant (within the error bars) over 18 days, we suggest that AT2016aa can be more precisely classified as a Type II-P SN.

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