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Asiago spectroscopic classification of PSN J02090990+3159515 in UGC 1641

ATel #7909; P. Ochner (INAF OAPd), M. Berton (DFA UniPd), A. Pastorello, S. Benetti, E. Cappellaro, N. Elias-Rosa, L. Tartaglia, G. Terreran, L. Tomasella, M. Turatto (INAF OAPd)
on 14 Aug 2015; 14:21 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 J02090990+3159515 in the galaxy UGC 1641, discovered by P. Campaner (ISSP). Informations on this transient are available from the "Bright Supernova" website (http://www.rochesterastronomy.org/snimages/) and the CBAT Transient Object Followup Reports (http://www.cbat.eps.harvard.edu/index.html). The observation was performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).

Name                         | Discovery      | z       |   Type   | Observation date |  Phase      | Notes  
PSN J02090990+3159515        | 2015-08-13.081 | 0.0167  |   II     | 2015-08-13.980   |  ~3-4 weeks | (1)      

(1) The spectrum shows P-Cygni lines of H, Fe II and Na I, typically observed in Type II SNe during the H recombination phase. However, these lines in PSN J02090990+3159515 are very narrow. The expansion velocity of the ejecta is very low, when compared e.g. with the low-velocity Type IIP SN 2005cs (Pastorello et al. 2009, MNRAS, 394, 2266). From the minimum of Halpha, we infer an ejecta velocity of about 2100 km/s (slightly lower, about 1700 km/s, from the minimum of Hbeta).

The classification was done with 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