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Spectroscopic classification of two type II SNe at Asiago

ATel #7712; S. Benetti, L. Tomasella, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, L. Tartaglia, G. Terreran, M. Turatto (INAF OAPd)
on 25 Jun 2015; 10:36 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Enrico Cappellaro (enrico.cappellaro@oapd.inaf.it)

Subjects: Supernovae

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of PSN J19535968+4956078 in UGC 11494 discovered by P. Campaner (ISSP) on 2015 Jun 12.01 and ASASSN-15ln (Atel #7670) in UGC 546 discovered by the All Sky Automated Survey for SuperNovae (ASAS-SN) on 2015 Jun 19.58. Informations on these transients are also 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 observations were performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).

 Name                  | Date (UT)    |  v     | Type  |  Phase     | Notes  
PSN J19535968+4956078 | 20150624.98  |  7518  |  II-P | ~2 weeks   |   1     
ASASSN-15ln           | 20150625.06  |  4501  |  II   | early      |   2  

Redshifts of the host galaxies are from NED

(1) The expansion velocity inferred from the position of the Halpha absorption is about 10500 km/s. Photometric monitoring from the ISSP collaboration shows that the object has maintained approximately constant magnitude over a period of about 10 days, suggesting that the object is a Type II-plateau SN.

(2) Halpha emissione is still very shallow. The expansion velocity inferred from the position of the Hbeta absorption is about 11000 km/s.

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.