ePESSTO spectroscopic classification of optical transients

ATel #10657; J. Lyman (Univ. of Warwick), D. Homan (Univ. of Edinburgh), M. T. Botticella (INAF-Capodimonte), K. Maguire, E. Kankare, S. J. Smartt, K. W. Smith, D. Young (QUB), C. Inserra, M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron, I. Manulis (Weizmann), D. Wright (Minnesota), K. C. Chambers, H. Flewelling, M. Huber, T. Lowe. E. Magnier, A. Schultz, C. Waters, R. J. Wainscoat, M. Wilman, J. Tonry, B. Stalder, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), A. Rest (STScI), A. Moller, B. Tucker, B. Zhang, B. Schmidt (Australian National University)
on 20 Aug 2017; 18:39 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Kate Maguire ([email protected])

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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 Pan-STARRS Survey for Transients (see Chambers et al. 2016, arXiv:1612.05560, and http://pswww.ifa.hawaii.edu ), 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 Skymapper Survey (see Scalzo et al. ATel #5480), the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts), the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680) and from the IAU TNS list (see https://wis-tns.weizmann.ac.il/). All observations were performed on the ESO New Technology Telescope at La Silla on 2017 08 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 
SMT17rfk    | SN2017fyo | 21:08:19.61 | -43:40:13.0 |  20170726  | SMT    |   18.51  | 0.036 |  Ia   | +12d    | (1) 
-           | SN2017gfh | 20:03:27.40 | +06:59:27.2 |  20170818  | TNS    |   18.95  | 0.024 |  IIb  | -       | (2) 
Gaia17cay   | SN2017gbh | 18:18:09.41 | +18:05:24.6 |  20170811  | Gaia   |   17.57  | 0.027 |  Ia   | +9d     | (3) 
Gaia17cbq   | AT2017gcj | 17:40:59.56 | -61:20:50.1 |  20170812  | Gaia   |   17.54  | -     |  CV   | -       | (4)  
ATLAS17jnn  | SN2017gdg | 23:26:30.76 | -24:27:52.3 |  20170812  | ATLAS  |   18.34  | 0.089 |  Ia   | at max. | 
SMT17scn    | -         | 22:02:41.48 | +02:11:25.9 |  20170816  | SMT    |   18.84  | 0.066 |  -    | -       | (5) 
ATLAS17jjb  | AT2017gfk | 20:01:44.08 | -33:58:57.9 |  20170810  | ATLAS  |   16.67  | -     |  CV   | -       | (6) 
PS17egq     | SN2017gfa | 22:41:50.02 | -26:06:26.0 |  20170814  | PS1    |   18.88  | 0.073 |  Ia   | at max. | 
ASASSN-17kx | SN2017gbv | 03:42:01.36 | -39:19:54.9 |  20170816  | ASASSN |   17.20  | 0.042 |  Ic   | at max. | (7) 
 

(1) Best spectral match from SNID is SN 1998bu at +12 d.
(2) Good spectral matches from SNID of Type IIb at max up to a few weeks post max.
(3) Best spectral match from SNID is SN 1992A at +9 d.
(4) Weak Balmer-series absorption at z=0.
(5) Spectrum dominated by host galaxy light.
(6) Balmer-series absorption at z=0.
(7) Spectrum contaminated by galaxy light. Best SNID match is to Ic SN 2004aw at max. but there are also reasonable matches to SNe Ia at a few weeks post max.