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ePESSTO spectroscopic classification of optical transients

ATel #11947; R. Stein (HU Berlin/DESY), E. Callis (UCD), Z. Kostrzewa-Rutkowska (SRON/RU), M. Fraser (UCD), J. Lyman (Warwick), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (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)
on 13 Aug 2018; 14:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (morgan.fraser@ucd.ie)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 11974, 12325, 12355

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); from the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014, ApJ, 788, 48 and http://www.astronomy.ohiostate.edu/~assassin/index.shtml ); and from 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 August 12, 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 
ATLAS18sto  | SN2018elp | 14:31:19.12 | +21:17:24.8 | 20180730   | ATLAS   | 18.3     | 0.030 | II   | +2w   | (1) 
ASASSN-18ro | SN2018evt | 13:46:39.32 | -09:38:36.6 | 20180808   | ASAS-SN | 17.9     | 0.029 | Ia   | -9d   | (2) 
ATLAS18tmf  | SN2018evy | 18:22:38.17 | +15:41:47.6 | 20180811   | ATLAS   | 17.5     | 0.018 | II   | +2d   | (3)  
ATLAS18tne  | SN2018exc | 21:00:08.02 | -40:21:30.9 | 20180807   | ATLAS   | 19.3     | 0.057 | Ia   | -10d  | (4)    
ASASSN-18rq | SN2018evw | 21:15:14.40 | +02:11:34.4 | 20180811   | ASAS-SN | 17.6     | 0.050 | Ia   | +3d   | 
ATLAS18tka  | SN2018evf | 23:09:35.80 | +05:35:12.1 | 20180808   | ATLAS   | 19.3     | 0.06  | Ia   | +3d   | 
ATLAS18tnc  | AT2018exa | 23:48:58.07 | -36:53:13.8 | 20180811   | ATLAS   | 18.6     | ?     | SN?  | ?     | (5) 
(1) Also known as Gaia18cca & ZTF18abklbam.
(2) Also known as ATLAS18tfh, now at o=16.7. Best matches with 91T-like templates.
(3) Very young type II. The +2 days is with respect to explosion (ATLAS limit c < 19.5 on 20180809). The spectrum is blue and largely featureless. Weak narrow emission is seen at Halpha and Hbeta, along with a broad bump at 4600 Ang likely associated with high ionization C/N lines blended with He II.
(4) The Si II 6355 velocity is ~25000 km/s with a likely contribution from a high-velocity component. Has reached o=17.4 +/- 0.07, or M_o = -19.6 and still rising. Further observations encouraged.
(5) A low S/N spectrum taken under poor conditions appears blue.