Padova-Asiago Supernova Group
Asiago Classification Program
2014dt in M61   Discovered by: Itagaki
Object type   SN   Ia-pec
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Reference:   ATEL6648  

P. Ochner, L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, A. Pastorello, M. Turatto, Osservatorio Astronomico di Padova, INAF, report that an optical spectrogram (range 340-1000 nm; resolution 1.2 nm) of 2014??, obtained on Oct. 31.20 UT with the Asiago 182-cm Copernico Telescope (+ AFOSC) under the Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841), shows that this is a peculiar type-Ia supernova. The spectrum shows a blue continuum with relatively weak and narrow Si II 635.5-nm absorption. Fe III lines at 430 and 500 nm are visible, suggesting that the object might be a member of the Type-Iax class of supernovae (Foley et al. 2013, Ap.J. 767,57). Classification was done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024), and assuming a heliocentric radial velocity of 1566 km/s for the host galaxy M61 (Bingelli et al. 1985, AJ 90, 1681 via NED). The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.