AstroNote 2019-50

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DRAFT
2019-07-24 10:34:00
Type: Object/s-Discovery/Classification
Asiago spectroscopic classification of optical transients
Authors: Lina Tomasella (INAF OAPd), Stefano Benetti (INAF OAPd), Enrico Cappellaro (INAF OAPd), Massimo Turatto (INAF OAPd), Irene Salmaso (UniPd, INAF OAPd))
Source Group: Padova-Asiago
Abstract:
We report the spectroscopic classifications of SN2019lrb (ASASSN-19sb) as type Ic at maximum, SN2019llt (ASASSN-19rv) as type Ia pre-maximum, and SN2019lrc (ZTF19abhxllw) as type Ia about 1 week before maximum.

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841), in the framework of the ASYAGO School Program (Asiago School for Young Astronomers with Galileo Observations, attending students: Francesco Antonuccio, Giovanni Benetti, Alberto Fantini, Emily Pertile, Anna Rigoni; tutors: Alessandro Siviero, Costantino Sigismondi), reports the following supernova classifications.

The targets were supplied by the All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014) and by the Zwicky Transient Facility (ZTF, see Atel #11266).

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

The classifications were 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.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2019lrb [ASASSN-19sb]13:07:02.794+13:04:27.88SN Ic0.0266MRK 07840.027439Spectrum similar to those of type Ic supernova SN 1990aa around maximum. However, the spectrum is also consistent with those of SNe Ia at maximum. The spectral continuum is very red allowing for a high host galaxy reddening which is also confirmed by an intense (EW~0.23nm) NaID absorption. The redshift has been derived from the narrow host galaxy lines. The expansion velocity deduced from the Si II 635.5 nm is about 10500 km/s13:07:02.910+13:04:28.13SN Ic0.027439
TNS2019llt [ASASSN-19rv]13:33:55.565+29:33:26.68SN Ia0.042MASX J13335542+29332550.037Best matches with several type Ia SNe few days before maximum light. The expansion velocity deduced from the Si II 635.5 nm is about 12000 km/s.13:33:55.480+29:33:25.85SN Ia0.037
TNS2019lrc [ZTF19abhxllw]22:26:27.065+03:28:31.38SN Ia0.041Best matches with several type Ia SNe about 1 week before maximum light. The expansion velocity deduced from the Si II 635.5 nm is about 13500 km/s.22:26:27.069+03:28:31.34SN Ia0.041