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 (firstname.lastname@example.org)
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).