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Asiago spectroscopic observation of two supernovae

ATel #6660; P. Ochner, S. Benetti, E. Cappellaro, N. Elias-Rosa, A. Pastorello, L. Tomasella, M. Turatto (INAF Osservatorio Astronomico di Padova)
on 3 Nov 2014; 10:26 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 J02262331+2739348 in UCG 1899 and the spectral confirmation of ASASSN-14dc (= PSN J02183806+3336583; ATel #6284).

The observations were performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.2 nm).

 
Name                    | Date (UT)    |  z       |   Type    |  Phase     | Notes   
PSN J02262331+2739348   | 20141102.94  |  0.0324  |    Ia     |  pre-max   | (1) 
ASASSN-14dc             | 20141102.97  |  0.04    |    IIn    |  4 month   | (2) 
 

(1) Heliocentric radial velocity of the host galaxy UGC 1899 from Saintonge et al. 2008, AJ 135, 588 via NED. Best match with several Type-Ia SNe around one week before B-band maximum light. The expansion velocity deduced from the Si-II 635.5 nm absorption is about 14800 km/s.

(2) A redshift z=0.043 was derived for the position of narrow [OIII] emissions. We confirm that the spectrum of this transient is very similar either to that of the stripped envelope core-collapse SN interacting with dense circumstellar medium (Type-IIn SN) SN 1997cy (Turatto at al. 2000, ApJ 534, L57), or to the SNIIn/SNIa-CSM SN 2005gj (Aldering et al. 2006, ApJ 650, 510; Prieto et al. 2007, arXiv:0706.4088; but see Benetti et al 2014, MNRAS 441, 289).

Classification was 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