ePESSTO spectroscopic classification of optical transients

ATel #12042; M. Gromadzki (Warsaw), T. Wevers (Cambridge), J. Lyman (Warwick), K. Maguire (QUB), S. Prentice (QUB), C. Inserra (Southampton), E. Kankare (QUB), S. J. Smartt (QUB), O. Yaron (Weizmann), D. R. Young (QUB), I. Manulis (Weizmann), J. Tonry, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST) A. Rest (STScI), K. W. Smith, O. McBrien (QUB), D. E. Wright (Univ. of Minnesota), T.-W. Chen (MPE), G. Leloudas (DTU Space), R. Cartier (CTIO)
on 16 Sep 2018; 19:26 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Mariusz Gromadzki (marg@astrouw.edu.pl)

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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 ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680)"; 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 ); the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 September 15, 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 
 Gaia18cfm    | AT2018fed | 17:02:23.82 | +01:14:15.8 |  20180815  | Gaia    |   18.8   | -      | CV     | -          | (1) 
 ATLAS18txu   | SN2018ffs | 20:54:37.15 | +22:04:51.4 |  20180813  | ATLAS   |   19.4   | 0.142  | SLSN I | -          | (2) 
 ATLAS18udo   | AT2018fri | 16:15:08.83 | +00:45:12.4 |  20180901  | ATLAS   |   18.1   | -      | CV     | -          | 
 ASASSN-18tr  | SN2018frv | 20:40:31.42 | -46:34:39.2 |  20180901  | ASASSN  |   18.0   | 0.043  | Ia     | +11 to +20 | 
 ATLAS18ujx   | SN2018fvm | 20:37:27.79 | -37:43:16.9 |  20180906  | ATLAS   |   17.8   | 0.018  | Ia     | -3         | 
 ATLAS18ukz   | SN2018fwi | 22:47:46.56 | -31:15:33.7 |  20180902  | ATLAS   |   18.6   | 0.115  | Ia     | +4 to +7   | 
 Gaia18cgf    | SN2018gif | 03:27:15.74 | +08:42:39.1 |  20180913  | Gaia    |   18.3   | 0.039  | Ia     | +8 to +10  | 
 ASASSN-18vp  | SN2018gio | 04:20:41.26 | -14:46:53.8 |  20180915  | ASASSN  |   17.3   | 0.042  | Ia     | at max | 
 ATLAS18vfv   | SN2018giq | 02:34:30.10 | -35:24:26.9 |  20180908  | ATLAS   |   19.3   | 0.079  | Ia-91T | -3         | 
  

(1) Strong emission in Balmer, He I and He II. Lines shifted by approximately 700km/s. AT2018fed was observed as part of the GREAT survey (Chen et al. ATel #10510) on August 19, 2018, with grizJHK = 19.16,19.11,19.07,18.97,18.829,18.144,17.93 AB mag. After Av=0.4 mag correction, T_BB > 9500 +/- 800 K
(2) Noisy blue continuum with clear Halpha (host galaxy) at z=0.142. Blue bump at restframe 4616A, which is not likely to be either He II or H-Beta. Long rise and now M_o ~ -20.5. GREAT survey observations indicate a black body temperature of T_BB ~ 9000 +/- 750 K obtained from the photometry taken on August 19, 2018 with griz = 18.56,18.52,18.41,18.4 AB mag, after Av=0.3 mag correction.