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 (firstname.lastname@example.org)
Subjects: Optical, Supernovae
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