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Asiago spectroscopic classification of two supernovae

ATel #7902; G. Terreran, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, L. Tartaglia, L. Tomasella, M. Turatto (INAF OAPd)
on 11 Aug 2015; 09:52 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 J19273770+5422340 in the galaxy NGC 6801 and PSN J00422186+2938415 in the galaxy IC 43, both discovered by Paolo Campaner (ISSP). Informations on these transients are also available from the "Bright Supernova" website (http://www.rochesterastronomy.org/snimages/), The ATel, 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 J19273770+5422340        | 2015-08-09.024 | 0.0145  |    II    |   +10d     | (1)       
PSN J00422186+2938415        | 2015-08-06.092 | 0.0162  |    Ic    | +2-3 months| (2)  

(1) Best match with normal Type-II SNe around 10 days after maximum light, adopting a redshift z=0.014547 (Springob et al. 2005, ApJS, 160, 149) for the host galaxy NGC 6801. A narrow Halpha component, superposed on the broad Halpha attributed to the SN, probably arises from an H II region close to the location of the SN. The expansion velocity of the ejected material, as inferred from the position of the broad absorption of Halpha, is about 9000 km/s.

(2) The redshift of the host galaxy (IC 43) is from Huchra et al. 1999, ApJS, 121, 287.

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.