Object type   SN Ia
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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, 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 redshift is in agreement with the photometric redshift of the probable host galaxy SDSS J005457.16+104747.9 (photoZ=0.099+/-0.05).
(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.