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 (firstname.lastname@example.org)
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.
Padova Asiago SN group