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ePESSTO spectroscopic classification of optical transients

ATel #11135; F. Bufano (INAF Catania), M. Berton (Uni Padova), C. Vogl (MPA), A. Floers, S. Taubenberger (ESO), M. T. Botticella (INAF Capodimonte), M. Gromadzki (Uni Warsaw), C. Inserra (Southampton), E. Kankare, K. Maguire, S. J. Smartt, D. Young, K. W. Smith, O. McBrien, D. Wright (QUB), O. Yaron, I. Manulis (Weizmann), J. Tonry, L. Denneau, A. Heinze, H. Weiland, K. C. Chambers, H. Flewelling, M. Huber, T. Lowe., E. Magnier, A. Schultz, C. Waters, R. J. Wainscoat, M. Wilman (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI)
on 6 Jan 2018; 17:47 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefan Taubenberger (tauben@mpa-garching.mpg.de)

Subjects: Optical, Supernovae

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 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 ) and 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 Jan 5, 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 
Gaia17dfv   | SN2017iwe | 13 33 12.07 | -16 07 06.0 |  20171209  | GaiaAlerts  |   18.2   | 0.020 | IIP    | +70d   |  
AT2017jcu   | SN2017jcu | 03 22 46.90 | +00 08 53.0 |  20171222  | POSS        |   17.9   | 0.023 | II     | young  | 
ASASSN-17rn | SN2017jeg | 08 36 24.64 | +26 07 24.6 |  20171226  | ASAS-SN     |   18.1   | 0.07  | Ia     | +10d   | (1,2) 
Gaia17dkh   | SN2017jfs | 12 29 37.78 | +07 49 35.1 |  20171226  | GaiaAlerts  |   17.2   | 0.008 | IIn    |        | (3,4) 
Gaia17dkl   | SN2017jfv | 13 38 25.35 | -31 15 52.7 |  20171225  | GaiaAlerts  |   17.6   | 0.038 | Ibn    | +15d   | (5) 
Gaia17dku   | SN2017jgf | 13 01 44.68 | -24 30 47.3 |  20171227  | GaiaAlerts  |   17.6   | 0.046 | Ia-91T | at max | (6) 
Gaia17dky   | SN2017jhf | 12 25 45.76 | -21 44 24.4 |  20171228  | GaiaAlerts  |   16.6   | 0.033 | Ia     | at max |  
PS17fuc     | SN2017jne | 09 11 43.32 | -00 15 31.9 |  20171228  | Pan-STARRS1 |   18.7   | 0.05  | II     | young  | (1) 
ATLAS18aap  | SN2017jym | 05 46 02.50 | -25 39 06.8 |  20171228  | ATLAS       |   18.8   | 0.041 | Ia     | at max |  

(1) Redshift from SNID.
(2) Good matches both with normal and 91T-like SNe Ia.
(3) Also discovered on 20171228 by Pan-STARRS1 as PS17fqp.
(4) Good matches with various SNe IIn and SN impostors. Absolute magnitude -15.5.
(5) Gelato provides a good match with SN 2005la two weeks after maximum.
(6) SNID also finds good matches with SNe Iax (z~0.036). However, at this redshift the SN would be at -19.0 mag, which is too bright for a SN Iax. We thus favour the 91T-like classification.