We report the spectroscopic observations of ASAS-SN19sv (SN2019lyb), ATLAS19qee (SN2019lwe) and ZTF19abimlck (SN2019lvf), under the TNG AT39DDT3 program and the Asiago Transient Classification Program (Tomasella et al. 2014). The targets were supplied by the All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680) and the Zwicky Transient Facility survey (ZTF; https://www.ztf.caltech.edu/; Kulkarni et al. 2018, ATel 11266).
The observations were performed with the 3.6m Italian TNG telescope (Canary Islands, Spain), equipped with the DOLORES camera using the multispectral VPHG GRIS-U (wavelength range: 1st order from 500 to 1000 nm, resolution 1.7 nm; 2nd order from 350 to 515 nm; resolution 0.9 nm).
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.
| Catalog | Name | Reported RA | Reported DEC | Reported Obj-Type | Reported Redshift | Host Name | Host Redshift | Remarks | TNS RA | TNS DEC | TNS Obj-Type | TNS Redshift |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TNS | 2019lyb [ASASSN-19sv] | 15:11:03.356 | +52:03:00.59 | SN Ia | 0.036876 | CGCG 274-031 | 0.036876 | The spectrum is similar to several type Ia SNe few days before maximum light (in agreement with classification of ZTF collaboration reported in TNS, Dugas et al.). Redshift of the host galaxy is from Falco et al. 1999 (PASP 111, 438 via NED). Using this redshift, an expansion velocity of about 11700 km/s is derived from the SiII 635.5 nm minimum. | 15:11:03.356 | +52:03:00.59 | SN Ia | 0.03692 |
| TNS | 2019lwe [ATLAS19qee] | 15:59:31.468 | +43:25:46.54 | SN Ia | 0.045 | SDSS J155931.36 +432546.9 | Best matches with type Ia SNe around one week before maximum light (in agreement with classification of ZTF collaboration reported in TNS, Dahiwale et al.). The redshift z=0.045 is derived from SNID/GELATO SN template fitting. Using this redshift, an expansion velocity of about 12300 km/s is derived from the SiII 635.5 nm minimum. | 15:59:31.460 | +43:25:46.63 | SN Ia | 0.038 | |
| TNS | 2019lvf [ZTF19abimlck] | 23:04:18.422 | +46:32:10.03 | SN Ia | 0.048083 | PGC 070388 | 0.048083 | The spectrum is similar to type Ia SNe few days before maximum light (in agreement with classification of ZTF collaboration reported in TNS, Dahiwale et al.). Redshift of the host galaxy is from Huchra et al. 2012 (ApJS 199, 26 via NED). Using this redshift, an expansion velocity of about 11800 km/s is derived from the SiII 635.5 nm minimum. | 23:04:18.400 | +46:32:10.03 | SN Ia | 0.048083 |
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