Asiago spectroscopic classification of five  transients

ATel #12546; S. Schuldt, C. Vogl, S. Taubenberger (MPA, Garching), A. Fiore, S. Benetti, E. Cappellaro, L. Tomasella, M. Turatto (INAF OAPd)
on 3 Mar 2019; 09:40 UT
Distributed as an Instant Email Notice Supernovae
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 observation of AT2019baw, ASASS-SN19dw (AT2019bjw), AT2019bao, ASASSN-SN19ea (AT2019bka), AT2019bgl. The targets were supplied by ASSASN, ZTF and ATLAS surveys.

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

 
 
Survey name   | IAU name  | Host galaxy             | Disc. Date (UT)     | Obs. Date (UT)       | redshift | type   |  phase    | notes  
ZTF19aakkuqb  | SN2019baw | UGC 1227                | 2019-02-20 03:42:45 | 2019-03-02 18:41:45  | 0.035938 | Ia     | +7d       | (1)  
ASASSN-SN19dw | SN2019bjw | LEDA 1814807            | 2019-03-02 09:36:00 | 2019-03-02 19:36:35  | 0.03005  | Ia     | -7d       | (2)  
ZTF19aaknate  | SN2019bao | UGC 5687                | 2019-02-24 05:57:03 | 2019-03-02 20:51:20  | 0.011885 | II-pec | few days  | (3) 
ASASSN-SN19ea | SN2019bka | SDSS J114427.20+194338.3| 2019-03-02 03:36:00 | 2019-03-02 21:53:41  | 0.024    | Ia-91T | -9d       | (4) 
ZTF19aakpcuw  | SN2019bgl | SDSS J172204.75+590647.4| 2019-02-12 12:20:09 | 2019-03-02 22:23:20  | 0.032    | Ib/c   | +1w       | (5) 
 
 
 

(1) Spectrum similar to those of several type Ia SNe, with a best match about one week after maximum light. The velocity of the ejecta, as measured from SiII 635.5 nm, is around 10100 km/s, using the redshift of the host galaxy UGC 1227 as reported by Martha at al. 1997 AJ 113 (via NED).

(2) Spectrum similar to several type Ia SNe, about one week before maximum light. We also note that a narrow Na I doublet feature is observed in absorption at the host galaxy redshift, with EW = 3.2 Ang, suggesting a significant line-of-sight reddening (E(B-V) ~ 0.5 mag).The redshift for the host galaxy is reported in SDSS DR6, 2007 (via NED). Using this redshift, an expansion velocity of about 11300 km/s is derived from the SiII 635.5 nm minimum.

(3)  Blue continuum with broad Balmer lines reminiscent of early (few days after explosion) type II SNe spectra. However H-alpha profile is possibly contaminated by HeI 667.8 nm line. The other HeI lines seem to be present. HeI 597.6 nm is intense, showing a sharp absorption and an intermediate width component (FWHM~5000 km/s). The expansion velocity deduced from the H-alpha minimum is 13400 km/s. The redshift for the host galaxy UGC 5687 (= PGC 1078) z=0.011885 is reported by Giovannelli and Avera 1997, AJ 114, 122 (via NED).

(4) Spectrum similar to SN 1991T, about 9 days before maximum light, though for the region below 400 nm where it shows a flux deficiency possibly due to a strong CaII feature. The redshift z~0.024 is derived from SNID/GELATO SN template fitting.

(5) The spectrum is similar to those of type Ib/c SNe few days after maximum.  The redshift has been deduced with SNID/GELATO SN template fitting and it is in agreement with z=0.031 reported in SDSS for the probable host galaxy SDSS J172204.75+590647.4.

The classification was performed using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383)
and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools.

The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.

Padova-Asiago SN Group