ePESSTO spectroscopic classification of optical transients

ATel #11114; C. R. Angus, S. Jones (Southampton), C. Frohmaier (Portsmouth), R. E. Firth, M. Smith (Southampton), T. W. Chen (MPE), L. Galbany (Pitt.), K. Maguire (QUB), C. Inserra (Southampton), E. Kankare (QUB), S. J. Smartt (QUB), D. Wright (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. R. Young (QUB), I. Manulis (Weizmann), L. Wyrzykowski (Warsaw Observatory, Poland)
on 30 Dec 2017; 19:41 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Robert Firth (r.e.firth@soton.ac.uk)

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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 ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts) and OGLE-IV Real-time Transient Search (Wyrzykowski et al., 2014 arxiv:1409.1095; http://ogle.astrouw.edu.pl/ ). All observations were performed on the ESO New Technology Telescope at La Silla on 2017 Dec 29, 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 
Gaia17dhq  | SN2017izu | 13 58 26.26 | -34 30 57.9 | 20171214   | GAIA   | 17.92    | 0.017 | Ia        | at max                  | (1) 
OGLE17jei  | AT2017jei | 03 14 12.02 | -71 12 25.4 | 20171107   | OGLE   | 21.10    | 0.058 | ?         | -                       | (2) 
Gaia17dkm  | SN2017jfw | 13 27 53.77 | -29 37 06.7 | 20171226   | GAIA   | 18.15    | 0.014 | Ia-91bg   | Several weeks after max | (3) 

(1) Redshift from host
(2) Object exhibits a 40 day rise, coincident with host galaxy core (MRSS 054-118874). Absolute mag M_i =~ -17.6. The spectrum indicates hot continuum, with narrow He II, HeI and H I strongly in emission. Potential tidal disruption event or circum-nuclear type II supernova; SNID provides best SN spectral matches with the Type IIn SN1998S
(3) SNID provides best spectral matches to SN1991bg at a phase of +45 days; redshift from host.