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Asiago spectroscopic observation of four transients

ATel #7877; P. Ochner, S. Benetti, E. Cappellaro, N. Elias-Rosa, A. Pastorello, L. Tartaglia, G. Terreran, L. Tomasella, M. Turatto (INAF OAPd)
on 6 Aug 2015; 12:16 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of PSN J23164332+3359476 in UGC 12474, discovered by C. Emmanouilidi; PS15bom in SDSS J232637.06-001723.0, discovered by the PS1 Science Consortium (Atel #7864); PSN J02484234+1418454 in UGC 2282, discovered by S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez and G. Guerrini of the Italian Supernovae Search Project (ISSP); and ASASSN-15mr, discovered by the All Sky Automated Survey for SuperNovae (ASAS-SN; ATel #7811). Informations on these transients are also available from the "Bright Supernova" website (http://www.rochesterastronomy.org/snimages/), The Astronomer’s Telegram, 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 
PSN J23164332+3359476        | 2015-08-05.99  | 0.017   |  Ia-pec  | pre-max    | (1)    
PS15bom                      | 2015-08-06.03  | 0.02    |    Ia    | pre-max    | (2)    
PSN J02484234+1418454        | 2015-08-06.06  | 0.024   |    Ia    | ~ 1 month  | (3) 
ASASSN-15mr                  | 2015-08-05.96  | 0.027   |  galaxy  |            | (4) 

(1) Best match with the 1991bg-like Type Ia SN 1986G, two or three days pre-maximum. The expansion velocity of the ejected material, as inferred from the position of the absorption of SiII 6355 A, is about 10700 km/s.

(2) The redshift, z~0.02, is derived from the position of the main SN features. The expansion velocity of the ejected material, as inferred from the absorption minimum of the SiII 6355 A line, is about 10500 km/s.

(3) Good match with several normal Type-Ia SNe around one month post-maximum.

(4) The spectrum is red and shows remarkable similarity with those of broadline AGNs. Along with several broad features, a few narrow absorption lines are detected, including Ca II H&K, the G-band, Mg I 5175 and Na ID, along with a relatively weak Halpha in emission.

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 SN group