Asiago classification of ASASSN-15so and PSN J00545681+1048036 as young Type Ia SNe

ATel #8259; L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, L. Tartaglia, G. Terreran, M. Turatto (INAF Osservatorio Astronomico di Padova)
on 9 Nov 2015; 01:06 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 PSN J00545681+1048036 discovered by J. Vales in anonymous galaxy, and ASASSN-15so in NGC 3583, discovered by the All Sky Automated Survey for SuperNovae (ASAS-SN, Atel#8256).

Informations on these transients are available from the "Bright Supernova" website (http://www.rochesterastronomy.org/snimages/) and The Astronomer Telegram. The observations were performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).

 
Name                      | Discovery UT| Obs. Date UT |z       |   Type   | Phase      |Notes 
PSN J00545681+1048036     | 20151105.83 | 20151108.95  |0.089   |    Ia    | max        | (1)  
ASASSN-15so               | 20151108.63 | 20151108.99  |0.007125|    Ia    | pre-max    | (2) 
 

(1) Best match with several Type Ia SNe few days before B-band maximum light. The expansion velocity of the ejected material, as inferred from the position of the absorption of the Si II 635.5 nm line is about 10800 km/s. The host galaxy could be SDSS J005457.16+104747.9 (photoZ=0.099+/-0.05), which is close to the transient.

(2) Best match with Type Ia SNe several days before B-band maximum light. The expansion velocity of the ejected material, as inferred from the position of the absorption of the Si II 635.5 nm line is about 12000 km/s.

Classification 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