SN2015ad (PSN J02484234+1418454) in UGC 2282, located 3" east and 9" south of the center of the galaxy, spotted by by Simone Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez and G. Guerrini on behalf of Italian Supernovae Search Project. Mag 17.7:7/31 (16.9:7/29), Type Ia (z=0.024) (References: ATEL 7877; SN PSN J02484231+1418292)
See attached image and confirmation ATEL.
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
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 Astronomerâs 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.