Asiago spectroscopic classification of three supernovae

ATel #7888; L. Tomasella, A. Pastorello, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, L. Tartaglia, G. Terreran, M. Turatto (INAF OAPd)
on 7 Aug 2015; 12:36 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

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The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of ASASSN-15np in the galaxy 2MASX J15060265+0733415 (ATel #7878) and ASASSN-15nq in 2MFGC 13779, discovered during the ongoing All Sky Automated Survey for SuperNovae; PSN J23470615+2929074 in NGC 7753 discovered by K. Itagaki.

Informations on these transients are also available from the "Bright Supernova" website (http://www.rochesterastronomy.org/snimages/), The ATel, and the CBAT Transient Object Followup Reports (http://www.cbat.eps.harvard.edu/index.html). The observations were performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).

 
Name                         | Discovery      | z       |   Type   | Phase      | Notes 
ASASSN-15np                  | 2015-08-06.89  | 0.038   |    Ia    |   max      | (1)      
ASASSN-15nq                  | 2015-08-07.04  | 0.030   |    Ia    |   max      | (2) 
PSN J23470615+2929074        | 2015-08-07.09  | 0.017   |    II    |  early     | (3) 

(1) Best match with normal Type-Ia SNe around the B-band maximum light. The expansion velocity of the ejected material, as inferred from the position of the absorption of SiII 635.5 nm, is about 10000 km/s.

(2) The host galaxy is 2MFGC 13779 (z=0.030418, via NED). The expansion velocity of the ejected material, as inferred from the position of the absorption of SiII 635.5 nm, is about 11800 km/s. Also classified as Type-Ia SN in Atel #7885.

(3) The host galaxy is NGC 7723 (z=0.017242, Springob et al. 2005, ApJS, 160, 149). Striking similarity with SN 1999em a few days after the explosion is found. Broad Balmer lines and He I 5876A are detected, with P-Cygni profile. The velocity of the ejected materia, as inferred from the position of the minimum of Hbeta, is about 9000 km/s.

Classifications were done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024). The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.

Padova Asiago Supernova Group