Classification Update for SN 2013ab
ATel #4839; J. M. Silverman, J. C. Wheeler, and E. Chatzopoulos (University of Texas), J. Vinko (University of Szeged), R. Kehoe (Southern Methodist University), R. Quimby (Kavli IPMU, University of Tokyo), G. H. Marion (Harvard-Smithsonian Center for Astrophysics), and P. J. Brown (Texas A&M University)
on 25 Feb 2013; 01:33 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Howie Marion (gmarion@cfa.harvard.edu)
We report that inspection of a spectrogram, obtained on
Feb. 22.38 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario
Low-Resolution Spectrograph) by S. Odewahn, shows that SN 2013ab (CBET
3422) has likely evolved into a type-IIP supernova. Prominent P-Cygni
features of H-alpha, H-beta, and He I 5876 are visible superimposed on
a hot blue continuum. Correlation with a library of supernova spectra
using the "SuperNova IDentification" code (SNID; Blondin and Tonry
2007, Ap.J. 666, 1024) indicates that 2013ab is a type-IIP supernova,
1-2 weeks after explosion. We note that spectra of multiple young SNe
IIP match our spectrum of SN 2013ab, whereas no templates of SNe IIb
match the data well. After removal of the host-galaxy recession
velocity of 1280 km/s (from narrow emission lines), the absorption
minimum of the H-alpha line is found to be blueshifted by about 11500
km/s.
