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Asiago spectroscopic classification of three supernovae

ATel #6140; P. Ochner, L. Tomasella, S. Benetti, A. Pastorello, N. Elias-Rosa, E. Cappellaro, M. Turatto (INAF Osservatorio Astronomico di Padova)
on 15 May 2014; 11:09 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

Referred to by ATel #: 6142

We report the spectroscopic confirmation of three supernovae with the Asiago 1.22-m Galileo Telescope (+ Boller & Chivens spectrograph; range 335-785 nm; resolution 0.9 nm):

A spectrogram of ASASSN-14at in UGC 11037 (ATel #6126) obtained on May 8.06 UT shows that the object is a type II supernova. Assuming a recessional velocity of 3127 km/s for the host galaxy (Schneider S. E., et al., 1990, ApJS, 72, 245; via NED), a good match is found with SNe II few days after explosion.

The spectrograms of PSN J13324911+4152151 obtained on May 14.84 UT shows that the object is a type Ia supernova. Assuming a recessional velocity of 8077 km/s for the host galaxy NGC 5214 (Woods 2006, AJ, 132, 197; via NED) a best match is found with the peculiar SN Ia 1998es about one week before maximum light, both SNe showing at this phase a shallow Si II 635-nm absorption. The prominent NaI-D interstellar doublet suggests the presence of significant extinction in the host galaxy, E(B-V)~0.4 mag. An expansion velocity of about 10500 km/s is derived from the minimum of the Si II 635-nm line.

The spectrograms of PSN J15024996+4847062 obtained on May 14.92 UT shows that the object is a type Ia supernova. Assuming a recessional velocity of 7836 km/s for the host galaxy PGC 2325560 (SDSS DR3 2004; via NED) a good match is found with several normal SNe Ia about one week before B-band maximum light. An expansion velocity of about 11000 km/s is derived from the minimum of the Si II 635-nm line.

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