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ePESSTO spectroscopic classification of optical transients

ATel #12153; M. Berton (FINCA), E. Congiu (Padova), S. Benetti (Padova), A. Fiore (Padova), A. Pastorello (Padova), C. Barbarino (Stockholm), M. Fraser (UCD), S. C. Williams (Lancaster), G. Leloudas (DTU Space), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), D. R. Young (QUB), O. Yaron (Weizmann), I. Manulis (Weizmann)
on 1 Nov 2018; 14:09 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Andrea Pastorello (andrea.pastorello@oapd.inaf.it)

Subjects: Optical, Supernovae, Transient

ePESSTO, the extended Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40; http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by the PMO-Tsinghua Transient Survey (PTSS, http://www.cneost.org/ptss/ ) and the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680).
All observations were performed on the ESO New Technology Telescope at La Silla on 2018 November 1st UT, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). Classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

 
Survey Name   |  IAU Name  | RA (J2000)  | Dec (J2000)  |   Disc. Date   |   Source    |  Discovery Mag. |     z    |  Type  |      Phase           | Notes 
 PTSS-18kmm   | SN 2018hoy | 01:40:28.24 | +03:33:22.94 | 2018-10-27.61  | PTSS	       | 18.8 (V)        | 0.06     |   Ia   | soon after max       | (1) 
 ATLAS18www   | SN 2018hkb | 01:02:38.40 | -06:23:33.13 | 2018-10-15.46  | ATLAS       | 18.09 (ATLAS-o) | 0.04288  |   Ia   | +2-3 weeks from max  | (2) 
 ATLAS18xic   | SN 2018hrk | 03:08:38.85 | -19:46:41.7  | 2018-10-14.54  | ATLAS       | 19.58 (ATLAS-c) | 0.1      | Ia-pec | a few days after max | (3) 
 
(1) The spectrum of SN 2018hoy (obtained on Nov 1.15 UT) resembles that of the Type Ia SN 1992A shortly after the B-band maximum. The redshift of the host galaxy,  
2MASX J01402765+0333365, is determined through the fit of the main SN features. The ejecta velocity, obtained from the wavelength of the Si II 635.5 nm minimum,  
is about 11100 km/s.  
(2) The spectrum of SN 2018hkb (obtained on Nov 1.17 UT) is that of a normal type Ia, 2-3 weeks after the B-band maximum light. The redshift of the host galaxy  
MCG -01-03-074 is from Diaz-Gimenez & Zandivarez, 2015, A&A, 578, 61. The ejecta velocity, as deduced from the minimum of the Si II 635.5 nm line, is about 10000 km/s.  
(3) The spectrum of SN 2018hrk (obtained on Nov 1.26 UT) resembles that of the peculiar 1991T-like Type Ia SN 1999ac a few days after the maximum light.  
The redshift is computed by fitting the main SN features.