ePESSTO spectroscopic classification of optical transients

ATel #11657; O. McBrien, P. Clark (Queen's University Belfast), J. Anderson (ESO), L. Galbany (U. Pitt), Z. Kostrzewa-Rutkowska (SRON/RU), G. Leloudas (DARK), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), O. Yaron (Weizmann), D. R. Young (QUB) J. Tonry, L. Denneau., H. Flewelling, A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST) A. Rest (STScI), K. W. Smith, (QUB), D. E. Wright (Univ. of Minnesota)
on 20 May 2018; 17:56 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stephen Smartt (s.smartt@qub.ac.uk)

Tweet

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 ATLAS survey, see Tonry et al. (2018 arXiv:1802.00879), the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014, ApJ, 788, 48 and http://www.astronomy.ohio-state.edu/~assassin/index.shtml ) and Stuart Parker (BOSS). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 May 19, 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 | Disc Mag |  z    | Type | Phase | Notes 
AT2018bta   | SN2018bta | 16:57:58.75 | -62:43:53.6 | 2018-05-17 | BOSS   | 16.4     | 0.0195| Ia   | -10d   | 
ATLAS18pek  | SN2018bsy	| 21:58:03.88 | -19:45:12.1 | 2018-05-12 | ATLAS  | 18.88    | 0.097 | Ia   | at max |   
ATLAS18pda  | SN2018bsq	| 16:35:42.76 | +04:49:33.2 | 2018-05-08 | ATLAS  | 18.94    | 0.06  | Ia   | -2d    | 
ASASSN-18ke | SN2018bsg	| 10:10:28.10 | +02:13:49.7 | 2018-05-15 | ASASSN | 17.90    | 0.0217| IIb  | -4d    | (1)  
ATLAS18oxz  | SN2017kdk	| 21:58:28.97 | -27:42:24.1 | 2018-05-13 | ATLAS  | 18.30    | 0.061 | Ia   | at max | (2)  
ATLAS17ipo  | AT2018brk	| 19:24:17.76 | -19:23:09.8 | 2018-05-12 | ATLAS  | 18.25    | 0     | cv   | +5d    | (3) 
ATLAS18oxn  | AT2018brh	| 16:04:53.68 | -28:14:21.2 | 2018-05-09 | ATLAS  | 17.65    | 0     | cv   | +10    | (4)  
 

(1) Noisy spectrum, blue with weak and broad H-alpha. Likely He I 5876 in absorption and reasonable match to 1993J before peak

(2) This has an IAU TNS name from 2017, due to spurious ATLAS detection that was automatically uploaded (date 2017-10-29), but real discovery date is as above.

(3) AT2018brk blue continuum, narrow H-alpha in emission at z=0. Blue stellar counterpart in Pan-STARRS.

(4) AT2018brh blue continuum, narrow H-alpha in emission at z=0. No stellar counterpart in Pan-STARRS. Spectrum almost identical to 2018brk.