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Asiago spectroscopic classification of six supernovae

ATel #6750; P. Ochner, S. Benetti, A. Pastorello, L. Tomasella, E. Cappellaro, N. Elias-Rosa, L. Tartaglia, G. Terreran, M. Turatto (INAF Osservatorio Astronomico di Padova)
on 25 Nov 2014; 14:48 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Supernovae

Referred to by ATel #: 6776

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of the following transients. Targets were supplied by the Gaia Photometric Science Alerts programme and by the CBAT Transient Objects Confirmation Page (TOCP).

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 J01510872+3155218   | 20141124.81  |  0.26    |   SLSNII  ? |             | (1)      
PSN J07591099+3254392   | 20141124.94  |  0.0174  |    IIn      |  2 weeks    | (2) 
PSN J11023520+5035094   | 20141124.97  |  0.0223  |    II       |  10 days    | (3) 
Gaia14adb               | 20141125.10  |  0.053   |    Ia       |  +20d       | (4) 
Gaia14adf               | 20141125.12  |  0.06    |    II       |  2 weeks    | (5) 
Gaia14adg               | 20141125.14  |  0.154   |    II       |  around max | (6) 

(1) The spectrum shows a blue continuum and broad features which can be consistent with Balmer lines (Hbeta and Hgamma), with superimposed narrow unresolved components. Narrow [OIII] lines are also detected. Accounting for the very luminous absolute mag of the transient (M~-22.6), the transient is consistent with both a SLSNII and an AGN. The redshift of the host galaxy SDSS J015108.70+315520.6, as derived from narrow emissions, is in fair agreement with its photometric redshift (z=0.241).

(2) Heliocentric radial velocity of the host galaxy UGC 4132 from de Vaucouleurs et al. 1991 RC3.9 via NED.

(3) Heliocentric radial velocity of the host galaxy UGC 6109 from Falco et al. 1999 PASP 111, 438 via NED. UGC 6109 is the same host galaxy as for SN 2007rt.

(4) The transient is close to SDSS galaxy SDSS J120512.03+215018.1, with photometric redshift z=0.05. The spectrum shows this is a type-Ia SN about 2 weeks after the maximum light. An expansion velocity of 9500 km/s is derived from the position of the minimum of the Si II 635.5-nm line.

(5) The transient is close to SDSS J120929.60+200613.3, with photometric redshift z=0.076.

(6) The transient is close to SDSS J115032.78-020617.0, with photometric redshift z=0.167.

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.

We acknowledge, for the Gaia transients, ESA Gaia (http://cosmos.esa.int/gaia), and the DPAC Photometric Science Alerts Team (http://gaia.ac.uk/selected-gaia-science-alerts) (Rixon et al, 2014, ATel #6593).

Padova Asiago SN group