Asiago spectroscopic classification of PS15cwx and PS15cwo

ATel #8301; L. Tartaglia, A. Pastorello, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, G. Terreran, L. Tomasella, M. Turatto (INAF OAPd)
on 19 Nov 2015; 11:23 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

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The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classifications of PS15cwx in 2MFGC 04279 and PS15cwo in SDSS J031116.60+011124.3 The targets were supplied by the Pan-STARRS Survey for Transients (see Huber et al., ATel #7153).

The observations were performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm).

 
 Name    |  Discovery  |  Obs. Date UT     |   z     | Type  |  Phase     | Notes 
 PS15cwx |  20151117   |  20151119.05      | 0.055   |  I    |  pre-max   | (1) 
 PS15cwo |  20151115   |  20151118.94      | 0.02723 | II    |  young     | (2) 

(1) The low S/N spectrum is consistent with those of broad line SNe Ic at early phases at a redshift of about 0.06, or with those of early phases type Ia-pec, 91T-like at a redshift of about 0.05 (this last classification is in agreement with Atel #8300). A significant Galactic reddening, E(B-V) = 0.15, is in part responsible of the observed red continuum. The rough redshift estimations are obtained from the positions of the broad SN features.

(2) We confirm the main findings of Kangas et al. 2015, ATEL #8296, that the object is a very young type II SN. However, we note that the spectrum is also consistent with that of early Type IIb events. The redshift of the host galaxy is taken from SDSS DR12.

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